2024 GMC SIERRA 1500

UNKNOWN OR OTHER

My issue is with my back up camera being useless in low lighting and dark situations. I live in a dark community sometimes and I cannot use my back up camera to get me down my driveway without opening both front windows. I had a 2016 GMC Sierra and I had no problem with it. I first brought it into the shop with this issue and they replaced the camera and that did nothing. The 2nd time I brought it in for the camera issue, they said it is a software issue and they are waiting for a fix. (That was back in June) I called GMC Customer care and opened a case, but that is falling on deaf ears as they are saying there is nothing they can do. They tell me to keep waiting on the dealership for the fix. My Daughter, son and friends are having the same issue, but they are adding additional lights. I refuse to do that, as I think GMC should take care of it.

VISIBILITY/WIPER

My issue is with my back up camera being useless in low lighting and dark situations. I live in a dark community sometimes and I cannot use my back up camera to get me down my driveway without opening both front windows. I had a 2016 GMC Sierra and I had no problem with it. I first brought it into the shop with this issue and they replaced the camera and that did nothing. The 2nd time I brought it in for the camera issue, they said it is a software issue and they are waiting for a fix. (That was back in June) I called GMC Customer care and opened a case, but that is falling on deaf ears as they are saying there is nothing they can do. They tell me to keep waiting on the dealership for the fix. My Daughter, son and friends are having the same issue, but they are adding additional lights. I refuse to do that, as I think GMC should take care of it.

UNKNOWN OR OTHER

System/Component: Service Brakes, Hydraulic Summary: Recurrent loss of brake performance and vibration in a 2024 GMC Sierra 1500. Front pads wear to 1–2 mm and front rotors become “very warped” within short mileage intervals; right‑front caliper previously seized; pad‑sensor circuit fault also documented. Multiple dealer repairs under 30k miles; condition recurs. Increased stopping distance and steering vibration at speed. Chronology (dates / approx. mileage): 09/06/2024 (~10,437): front brake repair; 01/13–14/2025 (~16,239): RF caliper seized repaired; 05/05–06/2025 (~20,734): pads 1–2 mm and rotors very warped; 08/15–18/2025 (~27,574): pads again ~2 mm and rotors very warped. ( Emissions soot collection and engine deceleration is another issue in the diagnostics.) Dealer: Chevrolet Buick GMC of Bellevue, WA. Status: Defect continues after multiple repairs; safety concern due to stopping distance and vibration.

VEHICLE SPEED CONTROL

System/Component: Service Brakes, Hydraulic Summary: Recurrent loss of brake performance and vibration in a 2024 GMC Sierra 1500. Front pads wear to 1–2 mm and front rotors become “very warped” within short mileage intervals; right‑front caliper previously seized; pad‑sensor circuit fault also documented. Multiple dealer repairs under 30k miles; condition recurs. Increased stopping distance and steering vibration at speed. Chronology (dates / approx. mileage): 09/06/2024 (~10,437): front brake repair; 01/13–14/2025 (~16,239): RF caliper seized repaired; 05/05–06/2025 (~20,734): pads 1–2 mm and rotors very warped; 08/15–18/2025 (~27,574): pads again ~2 mm and rotors very warped. ( Emissions soot collection and engine deceleration is another issue in the diagnostics.) Dealer: Chevrolet Buick GMC of Bellevue, WA. Status: Defect continues after multiple repairs; safety concern due to stopping distance and vibration.

SERVICE BRAKES

System/Component: Service Brakes, Hydraulic Summary: Recurrent loss of brake performance and vibration in a 2024 GMC Sierra 1500. Front pads wear to 1–2 mm and front rotors become “very warped” within short mileage intervals; right‑front caliper previously seized; pad‑sensor circuit fault also documented. Multiple dealer repairs under 30k miles; condition recurs. Increased stopping distance and steering vibration at speed. Chronology (dates / approx. mileage): 09/06/2024 (~10,437): front brake repair; 01/13–14/2025 (~16,239): RF caliper seized repaired; 05/05–06/2025 (~20,734): pads 1–2 mm and rotors very warped; 08/15–18/2025 (~27,574): pads again ~2 mm and rotors very warped. ( Emissions soot collection and engine deceleration is another issue in the diagnostics.) Dealer: Chevrolet Buick GMC of Bellevue, WA. Status: Defect continues after multiple repairs; safety concern due to stopping distance and vibration.

POWER TRAIN

10 speed transmission isn't shifting right in the lower gears has a wining noise

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine cooling). The vehicle was scheduled for the recall repair; however, the contact was informed that the recall repair could not be completed. The contact was informed that the computer system was not reading the machine. In addition, the contact stated that the appointment was rescheduled by the dealer twice. The manufacturer was made aware of the failure but provided no assistance. The vehicle had not experienced a failure.

LATCHES/LOCKS/LINKAGES:TAILGATE:LATCH

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed and towing a utility trailer, the contact stated that upon making a left turn, the tailgate opened inadvertently and struck the utility trailer, causing a dent in the tailgate. The vehicle was taken to the dealer, where the contact was informed that the failure was related to an unknown recall; however, the VIN was not included. The dealer determined that the upper part of the tailgate needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 20,500.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact attempted to notify the dealer about the issue, but received an automated message that referred the contact to a website. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not notified of the failure. The contact then received a letter to call the NTHSA Hotline if the recall repair was not performed in a timely manner. The contact had not experienced a failure.

POWER TRAIN

Transmission failed during acceleration leaving me in the middle of intersection almost hit by a semi truck that had to slam breaks. Then final shifted and redlined 6 times before shifting. Then proceeded to limp mode

POWER TRAIN

On 22 April I turned my truck in to the dealership service department due to recall of the L87 6.2L engine. Also, told the rep, "my truck was shifting hard". After inspection revealed the valve body needed replacing. My vehicle is still at the service department today with no remedy in sight. I asked if Gm could just replace my transmission because, the part is not coming. They explained they would replace the transmission, but they can't find a 10 speed transmission available to swap out. I call weekly to get updates. nothing!!

ENGINE

On 22 April I turned my truck in to the dealership service department due to recall of the L87 6.2L engine. Also, told the rep, "my truck was shifting hard". After inspection revealed the valve body needed replacing. My vehicle is still at the service department today with no remedy in sight. I asked if Gm could just replace my transmission because, the part is not coming. They explained they would replace the transmission, but they can't find a 10 speed transmission available to swap out. I call weekly to get updates. nothing!!

ENGINE

The contact owns a 2024 GMC Sierra 1500. The contact stated that while vacationing in Canada and driving at various speeds, the vehicle jerked, and the vehicle failed to accelerate as intended while depressing the accelerator pedal. In addition, the RPM fluctuated, and the engine revved abnormally. The contact stated that the vehicle failed to reverse(R) as intended. The contact was able to coast to the side of the road while in LIMP Mode. The vehicle was towed to a dealer, where it was diagnosed, and it was determined that the transmission had failed and needed to be replaced. The contact was informed that when the dealer contacted the manufacturer to order a new transmission, the manufacturer refused and informed the dealer to repair the current transmission. The vehicle was repaired. The contact stated that a week later, the vehicle experienced another failure. The contact stated that on a separate occasion, while approaching a stop sign, the brake pedal was depressed, and the engine revved unintendedly. The contact used force to depress the brake pedal. The failure persisted. The vehicle was taken to a dealer back in the USA; however, no cause for the failure was found. The vehicle remained at the dealer unrepaired. The manufacturer was notified of the failure and was awaiting the results of the diagnostic test. The failure mileage was approximately 9,000.

POWER TRAIN

The contact owns a 2024 GMC Sierra 1500. The contact stated that while vacationing in Canada and driving at various speeds, the vehicle jerked, and the vehicle failed to accelerate as intended while depressing the accelerator pedal. In addition, the RPM fluctuated, and the engine revved abnormally. The contact stated that the vehicle failed to reverse(R) as intended. The contact was able to coast to the side of the road while in LIMP Mode. The vehicle was towed to a dealer, where it was diagnosed, and it was determined that the transmission had failed and needed to be replaced. The contact was informed that when the dealer contacted the manufacturer to order a new transmission, the manufacturer refused and informed the dealer to repair the current transmission. The vehicle was repaired. The contact stated that a week later, the vehicle experienced another failure. The contact stated that on a separate occasion, while approaching a stop sign, the brake pedal was depressed, and the engine revved unintendedly. The contact used force to depress the brake pedal. The failure persisted. The vehicle was taken to a dealer back in the USA; however, no cause for the failure was found. The vehicle remained at the dealer unrepaired. The manufacturer was notified of the failure and was awaiting the results of the diagnostic test. The failure mileage was approximately 9,000.

ELECTRICAL SYSTEM

On [XXX] while traveling on a highway, the vehicle lost drive power—the gear selector would not remain in Drive and reverted to Neutral for approximately 10 minutes. This created a serious safety hazard due to sudden loss of propulsion in moving traffic. The event was captured by OnStar, which emailed an automated incident alert. I later received a GM safety recall notice concerning potential engine loss of propulsion for vehicles with the 6.2L L87 engine (NHTSA 25V-274 / GM N252494000/001/002). I presented the vehicle to Ewing Buick GMC (Plano, TX) on July 23, 2025 for recall service and retrieved it on July 28, 2025. Approximately one week later, during an interstate trip to Kansas City, the engine catastrophically failed about one hour from my destination, leaving the vehicle disabled on the roadway shoulder. Roadside assistance towed the truck to Briggs Auto (KS). Briggs Auto diagnosed engine failure and ordered a replacement engine. I was informed the engine is on back-order with no estimated arrival, and the shop is under-staffed, prolonging repairs. The vehicle remains out of service. The sequence—pre-recall loss of propulsion, post-recall service, and then engine failure within a week—shows a serious safety defect that can lead to sudden loss of power at highway speeds, risking a crash. Frequency: Loss of propulsion occurred at least twice (March highway incident; subsequent engine failure in early August). Warning Lights/Messages: [Gear refuse tom shift to Drive mode.] Injuries/Crashes: None, but risk was substantial due to sudden power loss. Dealer Involvement: Ewing Buick GMC (recall visit); Briggs Auto (diagnosis/engine order). Attachments/Supporting Docs: OnStar email, recall notice, repair orders, tow documentation, photos/video. Please investigate whether 2024 GMC Sierra trucks with the 6.2L L87 engine continue to pose a loss-of-propulsion risk after recall service and whether parts shortages/back-orders are delaying effective remedy INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION

ENGINE

On [XXX] while traveling on a highway, the vehicle lost drive power—the gear selector would not remain in Drive and reverted to Neutral for approximately 10 minutes. This created a serious safety hazard due to sudden loss of propulsion in moving traffic. The event was captured by OnStar, which emailed an automated incident alert. I later received a GM safety recall notice concerning potential engine loss of propulsion for vehicles with the 6.2L L87 engine (NHTSA 25V-274 / GM N252494000/001/002). I presented the vehicle to Ewing Buick GMC (Plano, TX) on July 23, 2025 for recall service and retrieved it on July 28, 2025. Approximately one week later, during an interstate trip to Kansas City, the engine catastrophically failed about one hour from my destination, leaving the vehicle disabled on the roadway shoulder. Roadside assistance towed the truck to Briggs Auto (KS). Briggs Auto diagnosed engine failure and ordered a replacement engine. I was informed the engine is on back-order with no estimated arrival, and the shop is under-staffed, prolonging repairs. The vehicle remains out of service. The sequence—pre-recall loss of propulsion, post-recall service, and then engine failure within a week—shows a serious safety defect that can lead to sudden loss of power at highway speeds, risking a crash. Frequency: Loss of propulsion occurred at least twice (March highway incident; subsequent engine failure in early August). Warning Lights/Messages: [Gear refuse tom shift to Drive mode.] Injuries/Crashes: None, but risk was substantial due to sudden power loss. Dealer Involvement: Ewing Buick GMC (recall visit); Briggs Auto (diagnosis/engine order). Attachments/Supporting Docs: OnStar email, recall notice, repair orders, tow documentation, photos/video. Please investigate whether 2024 GMC Sierra trucks with the 6.2L L87 engine continue to pose a loss-of-propulsion risk after recall service and whether parts shortages/back-orders are delaying effective remedy INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION

FUEL/PROPULSION SYSTEM

My wife and I were traveling on a county road and without warning, the vehicle skipped twice and cut off in the middle of the roadway in a sharp curve with rain threatening at approximately 7:30 p.m. ET August 11, 2025. I attempted to restart numerous times because we were in the middle of the right lane. The starter would spin but vehicle would not restart. The truck then would not shut off and draining the battery. I called for a wrecker and the Sheriff's Office to keep somebody from hitting us. Before the wrecker came, we connected a diagnostic device to the vehicle indicating it was the fuel pump module.0August 12, 2-25, I called GM Roadside Assistance to be towed to closest dealership. The driver said he was familiar with a lot of GM trucks with the same issue. The vehicle has less than 12,000 miles and was purchased in June, 2024.

ENGINE AND ENGINE COOLING

The contact owned a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the low oil warning light illuminated. After a visual inspection, the contact observed that the engine was abnormally low on oil, though the vehicle had recently been serviced. The vehicle was taken to an independent mechanic, who did not provide a specific diagnosis but observed metal shavings inside the oil filter. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); the VIN was included but the vehicle was not repaired. The manufacturer was notified of the failure but provided no assistance. The failure mileage was 16,000.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact stated that while driving at various speeds, the engine made an abnormal sound. No warning lights were illuminated. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the failure. The failure mileage was approximately 11,000.

ENGINE

I have not had an incident yet. However GM itself has told us that the car has a high probability of having a major problem while driving and it has caused numerous injury related accidents. In fact, they will not let us trade the vehicle or sell the vehicle because the car is dangerous to drive. They also have no timeline on fixing the vehicle, which requires an engine replacement. This is also an environmental problem as the temporary mitigation of the problem (I say mitigation because it does NOT solve the problem) significantly changes the fuel efficiency of the vehicle. GM should be forced to let us trade the vehicle back with a solid valuation of our vehicle as if the problem did not exist. No solution short of putting a new engine in the vehicle or allowing us to trade the vehicle in immediately should be acceptable. NHTSA is aware of the problem but for some reason seems to be ignoring it. When VW had an engine problem, which was not a safety hazard, VW made it right. GM has no intention of doing anything about it.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact was concerned that the failure could occur and that the parts were not yet available. The contact stated there was a lot of pressure and worry about what might happen should the failure occur. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the concerns. The contact had not experienced failure.

POWER TRAIN:AUTOMATIC TRANSMISSION

The contact owns a 2024 GMC Sierra 1500. The contact stated that while attempting to reverse out of a parking space, the transmission failed to respond while in reverse. Additionally, the vehicle operated in LIMP Mode. The vehicle was driven in LIMP Mode to the nearest dealer, who diagnosed the vehicle and determined that the transmission valve body was faulty and needed to be replaced. The transmission valve body was replaced. The vehicle was towed back to the residence from out of state. The manufacturer was notified of the failure. The failure mileage was 6,400.

ENGINE

AS PART OF THE ENGINE RECALL ASSOCIATED WITH MY VEHICLE I HAD A REPAIR SCHEDULED AT PARKS GMC IN GREENVILLE, SC LOCATED ON LAURENS RD. WHEN I ARRIVED AT THE DEALERSHIP THIS MORNING I WAS TOLD THAT THEY HAD THE PARTS AND PROTOCOL BUT COULD NOT REPAIR MY RECALL BECAUSE GENERAL MOTORS WAS AT RANDOM SELECTING VIN NUMBERS TO DETERMINE WHICH ONES THEY WOULD REPAIR. THE SERVICE ADVISOR (KEVIN BLACKSTON) TOLD ME THAT GM WAS FIXING NEW VEHICLES FIRST AND THAT THEY COULD NOT DETERMINE WHEN MINE WOULD BE AVAILABLE FOR REPAIR. I DONT UNDERSTAND HOW THEY CAN SCHEDULE ME IN TO PERFORM THE REPAIR AND THEN REFUSE TO MAKE THE REPAIR STATING THAT THERE IS NO SOLUTIONS WHEN IN FACT THE SERVICE ADVISOR EXPLAINED IN DETAIL WHAT WOULD BE PERFORMED ON MY VEHICLE. HOW CAN GM ALLOW PEOPLE TO BE ON THE ROAD IN AN UNSAFE VEHICLE YET HAVE THE PARTS ON THE SHELF TO MAKE NEEDED REPAIRS. THE OTHER ISSUE I HAVE IS THAT THIS DEALERSHIP IS USING THIS RECALL TO [XXX] CLIENTS. A FEW MONTHS BACK WHEN I WENT IN FOR AN OIL CHANGE THEY SENT ME A TEXT MAKING AN OFFER IF I WAS INTERESTED IN SELLING THE VEHICLE. WHEN I WENT IN TO GET THE VEHICLE APPRAISED THEY TOLD ME THAT THEY COULDNT OFFER ME THE AMOUNT IN THE TEXT MESSAGE BECAUSE THE RECALL HADNT BEEN REPAIRED AND AT BEST COULD GIVE ME ABOUT 9,000 LESS. WHICH SOUNDS LIKE THEY ARE GETTING OVER ON PEOPLE AND MAKING A LOT MORE MONEY OFF OF GMs MISTAKE. I HAVE BEEN WANTING TO SELL MY VEHICLE AND GET ANOTHER VEHICLE FOR A FEW MONTHS AND I AM STUCK WITH THIS POTENTIALLY UNSAFE AND UNRELIABLE VEHICLE WHILE THE DEALERSHIP HOLDS ON TO PARTS FOR OTHER VEHICLES. I NEED ASSISTANCE IN PUSING PARKS GMC TO MAKE THE NEEDED REPAIRS. IF THE ENGINE WERE TO BREAKDOWN BEFORE THE REPAIR IS COMPLETED I COULD BE OUT OF A VEHICLE FOR MONTHS. I HAVE 2 CHILDREN TO GET BACK AND FORTH TO SCHOOL AND WORK THAT HAS TO CONTINUE WITH OUR WITHOUT A GOOD VEHICLE. ANY ASSISTANCE IN THIS MATTER WOULD BE GREATLY APPRECIATED!!!! ALSO I HAVE ALREADY CONTACT GM CUSTOMER SUPPORT INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION A

ENGINE

GMC has been aware of this problem since May 2025. They still do not have a remedy. This vehicle has not been operated for 41 days, since the recall states "The connecting rod and/or crankshaft engine components in these vehicles may have manufacturing defects that can lead to engine damage and engine failure. If the engine fails during vehicle operation, the vehicle will lose propulsion, increasing the risk of a crash." Letter sent to GMC, but this site is not allowing me to download it. Safety recall N252494000

STEERING:RACK AND PINION

The contact owns a 2024 GMC Sierra 1500. The contact stated that while idling in the driveway, the steering wheel became inoperable. Additionally, the contact stated that after parking the vehicle, the vehicle failed to start. There was no warning light illuminated. The vehicle was towed to the local dealer, where it was diagnosed that the power steering control module(PSCM) needed to be replaced and reprogrammed. The vehicle was repaired, but the failure recurred while driving away from the dealer. The contact stated that the steering assist warning light was illuminated, and the message "Stop Driving" was displayed. The vehicle was taken back to the same dealer, where it was determined that the steering rack and pinion needed to be replaced; however, the parts were on backorder. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 5,754.

STEERING

The contact owns a 2024 GMC Sierra 1500. The contact stated that while idling in the driveway, the steering wheel became inoperable. Additionally, the contact stated that after parking the vehicle, the vehicle failed to start. There was no warning light illuminated. The vehicle was towed to the local dealer, where it was diagnosed that the power steering control module(PSCM) needed to be replaced and reprogrammed. The vehicle was repaired, but the failure recurred while driving away from the dealer. The contact stated that the steering assist warning light was illuminated, and the message "Stop Driving" was displayed. The vehicle was taken back to the same dealer, where it was determined that the steering rack and pinion needed to be replaced; however, the parts were on backorder. The vehicle was not repaired. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 5,754.

ENGINE

I purchased my GMC Sierra AT4 from your Oman GMC distributor called Moosa Abdulrehman Hassan. The vehicle suddenly stops and transmission automatically shift from 'D' driving mode to 'N' natural. First it happened when the vehicle driven 200km only when I took it to dealer Moosa Abdulrehman Hassan, they re-programmed the vehicle and doesn't know what the problem is. Second time happened when the vehicle was driven approx. 1,600 km and 3rd time again happened on [XXX], engine stopped and transmission shifted automatically from D to N, I have to start the engine and continue my journey. Again, I brought the vehicle to GMC dealer Moosa Abdulrehman Hassan. They kept the vehicle for almost one week and unable to demonstrate or diagnose the problem and asked me to collect the vehicle. Its high risk to drive the vehicle, when suddenly the engine stops and the gear shift from 'D' to 'N' while driving. I had option to choose, Ford 150 or Dodge Ram I bought GMC because it suppose to be reliable and have the best safety features. But I really regret now why I have purchased it, there are no technicians in Oman with GMC dealer to identify and fix the problem. I can't drive the vehicle in such condition, risking my life and life of other drivers on the road. The vehicle is parked in my Garage, it new vehicle just completed 1800 km. The the dealer the solution is very simple, either fix the issue, or replace the car or refund my money back, the dealer is not doing any of these. Before taking legal action and reporting it to the court, which will bring shame to GMC reputed brand. I though I'll give my final try to report it to you. You are the manufacturer may be have a solution. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra. The contact became aware that the VIN was included in NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The dealer was contacted and confirmed that parts were not yet available for the recall repair. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

SERVICE BRAKES

GM is recommending that I replace my brakes for the 3rd time within 30,000 miles but cannot explain the irregular wear. I am confident that there is a larger issue causing this is the brakes failing are just a symptom of a larger issue that have failed to address after 6 dealership visits, escalating (twice - due to first advisor never getting back to me) to GM customer care, emailing an executive, regional service manager, and countless hours to fix the safety issue of my brakes (and the larger root cause issue). GM Customer Care Case #[XXX] - BRAKE SAFETY ISSUE 2024 GMC Sierra AT4 (VIN: [XXX]) - 46,000 miles Nov 2023: 1st visit - Brake squeal at 25K. Pads replaced, GM denied warranty. Early 2024: SAFETY ISSUE RETURNED at 30K miles. May 2025: 2nd visit - Worsening brake noise. Dealer couldn't replicate despite video evidence. Recommended $500 repair. Manager acknowledged "irregular/abnormal" wear. June 2025: 3rd & 4th visits - Tech found unexplained "weird line" on pad. Manager Kyle confirmed unusual wear but no root cause identified. June 10: Opened GM case #[XXX] after dealership failures. July 7: GM failed to coordinate promised appointment. July 14: 5th visit - Les Stanford Buick GMC, Ferndale. Tech rode with me, CONFIRMED BRAKE SAFETY ISSUE but offered no solution. CRITICAL SAFETY CONCERN: Recurring brake defect with abnormal wear patterns acknowledged by multiple technicians. Same brake failure pattern occurring 3 times in 18 months poses serious safety risk. Despite 5 dealership visits, video evidence, and confirmed defect, GM refuses warranty coverage while acknowledging the problem exists. Issue remains unresolved - I've exhausted all customer remedies. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

STRUCTURE:BODY:TAILGATE

The contact owns a 2024 GMC Sierra 1500. The contact stated that while her husband was driving 55 MPH, the driver’s hand touched the tailgate button, and the tailgate opened. The contact was concerned about the items in the rear falling onto the highway. The driver pulled over and secured the items in the vehicle. There were no warning lights illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 2,000. The VIN was not available.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra. The contact received a notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

STRUCTURE

The contact owns a 2024 GMC Sierra 1500. The contact stated that after driving the vehicle for 20 minutes, the contact would feel significantly weaknand would faint. The contact later noticed that water was leaking from the windshield, which led to a mold infestation. The vehicle was taken to the dealer, and the contact provided a video of the leaking windshield to the dealer; however, the dealer informed the contact that the failure could be duplicated, and no issues were found. The vehicle was not diagnosed or repaired. The contact stated that the Aerotech company had confirmed the presence of mold in the air filter. The contact stated that she had a genetic predisposition to mold, and the mold infestation had caused the contact to sustain swollen sinuses, rashes, hives, to feel tired and to faint at times. The contact sought medical assistance, and the contact's Doctor provided a document that stated that it was unsafe for the contact to operate the vehicle due to the mold. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 10.

STRUCTURE:BODY

2024 GMC Sierra 1500. While driving approximately 75 MPH, the front chrome grille deflector came loose from the passenger side of the vehicle and started flapping. Before I could safely pull over it became detached and flew over the hood of the vehicle striking the front windshield before nearly hitting another moving vehicle behind me. This caused damage to the hood, the other driver did not stop. While the 2024 model vehicle is not listed in NHTSA Campaign Number: 25V060000 (STRUCTURE) recalled on the 2022 model, GM lists the same part number for the 2022-2024 models, therefore the recall should include these years as well. The failure mileage was 27,500.

ENGINE

I recently purchased a 2024 GMC Sierra 1500. On July 14, 2025, I was informed of a recall involving the L87 engine and a risk of loss of propulsion. This is a major safety concern that can cause the vehicle to suddenly lose power while driving. I was advised not to drive the truck due to safety reasons, but GM has not released a fix or repair solution for this recall. This issue puts my safety and the safety of others at serious risk, as the vehicle could lose power without warning on the road. I contacted the dealership (Findlay Chevrolet, Las Vegas) and GM directly, but no timeline or resolution has been provided. I am now stuck with a vehicle I cannot legally or safely drive and no support from the manufacturer to resolve the issue. There were no warning lamps or prior symptoms before the recall was issued. The problem has been acknowledged by the manufacturer but remains unresolved. The vehicle has been inspected and the recall confirmed by the dealership, but they stated there is no fix currently available. I am requesting that NHTSA take this seriously and put pressure on GM to either provide a safe solution, a loaner vehicle, or a buyback program until the recall can be resolved.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra1500. The contact received notification from the OnStar App regarding NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and informed the contact that the vehicle could not be repaired. The manufacturer was made aware of the issue and stated that no assistance would be provided until an authorization letter was sent to the contact for the recall repair to be performed. The contact had not experienced a failure. Parts distribution disconnect.

POWER TRAIN

There is an active recall regarding the safety of my vehicle. NHTSA: 25V274 Manufacturer: N252494000 I contacted GM and was told to see a dealer to have my engine replaced. The dealer is refusing to remedy the recall and pointed me back to GM stating that "GM told us not to service this recall because there isn't yet a remedy". I'm stuck with a very unsafe vehicle that is less than 1 year old and the manufacture is refusing to honor their own recall.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, the part to do the recall repair was not yet available. The local dealer was contacted, and it was confirmed that the part was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

ENGINE

Dealership is unable to remedy issue stated on recall notice in a timely manner, I stopped by today and they told me they can’t do it right now and they have no idea when they will be able to so in the meantime drive it, to which I stated just drive it and if the engine fails on me then oh well? And they said yes there’s nothing we can do right now. Ridiculous putting my family’s safety at risk if the engine fails and they won’t even do the inspections

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The dealer was contacted and confirmed that the parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

SERVICE BRAKES

Trailer Brake Controller displays message on Dash intermittently that the trailer brakes are disconnected, and after a short pause it will say reconnected. This occurs multiple times a day. This did not occur with my previous GMC. I do have solar panels and Lithium batteries

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was contacted. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

FORWARD COLLISION AVOIDANCE

The contact owns a 2024 GMC Sierra 1500. The contact stated while driving 45 MPH, the low fuel warning light, the forward collision avoidance warning light, the check engine warning light and other unknown warning lights were illuminated. The message "Steering Assist Reduced" was displayed. The contact stated that the vehicle lost motive power. The contact was able to pull to the side of the road. The vehicle failed to restart and was towed to the dealer to be diagnosed, but the dealer could not determine the cause of the failure. The contact stated that the failure recurred while driving. The vehicle was towed to the dealer, where it was being diagnosed. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Action Number: PE25001(Engine, Engine and Engine Cooling) and NHTSA Campaign Number: 25V274000(Engine and Engine Cooling). The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 20,000.

STEERING

The contact owns a 2024 GMC Sierra 1500. The contact stated while driving 45 MPH, the low fuel warning light, the forward collision avoidance warning light, the check engine warning light and other unknown warning lights were illuminated. The message "Steering Assist Reduced" was displayed. The contact stated that the vehicle lost motive power. The contact was able to pull to the side of the road. The vehicle failed to restart and was towed to the dealer to be diagnosed, but the dealer could not determine the cause of the failure. The contact stated that the failure recurred while driving. The vehicle was towed to the dealer, where it was being diagnosed. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Action Number: PE25001(Engine, Engine and Engine Cooling) and NHTSA Campaign Number: 25V274000(Engine and Engine Cooling). The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 20,000.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact stated while driving 45 MPH, the low fuel warning light, the forward collision avoidance warning light, the check engine warning light and other unknown warning lights were illuminated. The message "Steering Assist Reduced" was displayed. The contact stated that the vehicle lost motive power. The contact was able to pull to the side of the road. The vehicle failed to restart and was towed to the dealer to be diagnosed, but the dealer could not determine the cause of the failure. The contact stated that the failure recurred while driving. The vehicle was towed to the dealer, where it was being diagnosed. The vehicle was not diagnosed or repaired. The contact related the failure to NHTSA Action Number: PE25001(Engine, Engine and Engine Cooling) and NHTSA Campaign Number: 25V274000(Engine and Engine Cooling). The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 20,000.

ELECTRICAL SYSTEM

Intermittently there isn't any sound from informational center speakers, this includes not sound of the turn signal indicators working. No sound from any vehicle component, vehicle has the current software release from GM. the only way I've found to get sound again is to leave the vehicle set not running for some period of time, short off then back on doesn't seem to clear the issue. I've check with the dealer and from what I understand this is a known issue with 2024 & 2025 GM informational centers.

ENGINE

I received the vehicle recall from GMC and contacted my dealership to inform them I was having a lagging issue with power in my truck. I inquired if I can bring the truck in to have it looked at under the recall, but was informed that no remedy was provided, and I also have to wait until my VIN# came up for inspection which no date or time frame was available. The next question I ask was can I get a loaner vehicle based on the recall which can cause an accident with engine propulsion failure. The local dealership and GM failed to provide a loaner vehicle which I feel unsafe driving my current vehicle. I also asked the dealership if GM is willing to buy the vehicle back from me and yet again, no response. Local dealership is Heritage Buick GMC of Rockwall Texas.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact stated that while attempting to start the vehicle, the engine failed to turn over. No warning lights were illuminated. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted, and AAA arrived, and the vehicle was jump-started. The vehicle was taken to a local dealer where the vehicle was diagnosed and determined that the engine needed to be replaced. The vehicle remained at the dealer awaiting parts. The vehicle was not repaired, and after several weeks, the contact was advised that the vehicle could no longer remain at the dealer. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 19,300. VIN tool confirms parts not available.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The manufacturer was made aware of the issue and confirmed that parts were not yet available. The contact had not experienced a failure. VIN tool confirms parts not available.

ENGINE

I am filing a formal complaint against GMC and R.B. Fries GMC regarding a catastrophic engine failure that occurred in my 2024 GMC Sierra 1500 Denali just over a month after purchase, with only 1,188 miles on the vehicle. The engine completely failed and had to be fully replaced. I contacted GMC and submitted a claim seeking a buyback or replacement under the Lemon Law and warranty protections. My claim was rejected, and I was offered no resolution, despite the seriousness of the failure and the fact that it occurred under normal use and well within the warranty period. This alone was unacceptable, but the situation has worsened. The truck is now experiencing additional issues, and I have scheduled an appointment with Eynon GMC (earliest available: June 23, 2025, scheduled through Karen). In the meantime, I am reaching out to other GMC dealers in hopes of getting service sooner, as I no longer trust this vehicle at all. This has been the worst automotive experience I’ve ever had. I expected a reliable product and proper customer support for a brand-new truck, especially one marketed as premium. Instead, I am left with serious concerns for my safety and financial loss. All communication is attached, and I do have witnesses for my claims including phone conversations with service and sales. As of today, I was again told by a phone call from GM that they will offer me nothing. The dealer I purchased it from has not responded. The Truck if I can find someone to take it on a trade (as most are refusing-even GMC dealers) are offering over 10K less than paid.

UNKNOWN OR OTHER

Subject: Urgent Safety Complaint Dear GMC Customer Service, I hope this message nds you well. I am formally reporting a serious safety issue with my GMC vehicle. The car has experienced multiple dangerous incidents due to likely electrical or software faults, losing power suddenly on two occasions while driving. This is especially concerning given the low mileage of 20,000 km and that the vehicle is still under warranty. Vehicle Information: • Model: GMC Sierra SLE, 2024 • VIN: [XXX] • Current Mileage: 20,000 km Description of the Problem & History: 1. First Incident (At 3,000 km): o The vehicle completely shut down due to an electrical or system software issue while driving. o The vehicle was towed to the dealer and held for over two weeks for repairs. 2. Second Incident (Recently): o The vehicle again lost functionality; the gear was stuck in 1st gear, and I was unable to manually shift. o This occurred while driving, creating another unsafe situation. o The vehicle was again taken to the dealer for repair, and to date, I have not been informed of the root cause. Actions Taken: The vehicle was brought to Sarhan, UAE (Sharjah), Al Ghandi Auto after the rst incident. Despite inspections and repair attempts, the issue has recurred, indicating it was not resolved. And I am prepared to provide photographic or video evidence if necessary. Additional Context: • The vehicle is less than one year old and has been regularly serviced on time at authorized centers. The recurring issues strongly indicate an underlying reliability or manufacturing defect. Due to the severity and recurrence of these failures, I refuse any further repair attempts. I formally request either a full refund or a replacement vehicle, as this is unacceptable for a new car. Please acknowledge receipt of this complaint promptly and advise on the next steps for a swift resolution. Sincerely, [XXX] Phone: [XXX] Email: [XXX] Location: Sharjah, UAE INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ELECTRICAL SYSTEM

Subject: Urgent Safety Complaint Dear GMC Customer Service, I hope this message nds you well. I am formally reporting a serious safety issue with my GMC vehicle. The car has experienced multiple dangerous incidents due to likely electrical or software faults, losing power suddenly on two occasions while driving. This is especially concerning given the low mileage of 20,000 km and that the vehicle is still under warranty. Vehicle Information: • Model: GMC Sierra SLE, 2024 • VIN: [XXX] • Current Mileage: 20,000 km Description of the Problem & History: 1. First Incident (At 3,000 km): o The vehicle completely shut down due to an electrical or system software issue while driving. o The vehicle was towed to the dealer and held for over two weeks for repairs. 2. Second Incident (Recently): o The vehicle again lost functionality; the gear was stuck in 1st gear, and I was unable to manually shift. o This occurred while driving, creating another unsafe situation. o The vehicle was again taken to the dealer for repair, and to date, I have not been informed of the root cause. Actions Taken: The vehicle was brought to Sarhan, UAE (Sharjah), Al Ghandi Auto after the rst incident. Despite inspections and repair attempts, the issue has recurred, indicating it was not resolved. And I am prepared to provide photographic or video evidence if necessary. Additional Context: • The vehicle is less than one year old and has been regularly serviced on time at authorized centers. The recurring issues strongly indicate an underlying reliability or manufacturing defect. Due to the severity and recurrence of these failures, I refuse any further repair attempts. I formally request either a full refund or a replacement vehicle, as this is unacceptable for a new car. Please acknowledge receipt of this complaint promptly and advise on the next steps for a swift resolution. Sincerely, [XXX] Phone: [XXX] Email: [XXX] Location: Sharjah, UAE INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

UNKNOWN OR OTHER

Subject: Urgent Safety Complaint Dear GMC Customer Service, I hope this message finds you well. I am formally reporting a serious safety issue with my GMC vehicle. The car has experienced multiple dangerous incidents due to likely electrical or software faults, losing power suddenly on two occasions while driving. This is especially concerning given the low mileage of 20,000 km and that the vehicle is still under warranty. Vehicle Information: •Model: GMC Sierra SLE, 2024 •VIN: [XXX] •Current Mileage: 20,000 km Description of the Problem & History: 1.First Incident (At 3,000 km): oThe vehicle completely shut down due to an electrical or system software issue while driving. oThe vehicle was towed to the dealer and held for over two weeks for repairs. 2.Second Incident (Recently): oThe vehicle again lost functionality; the gear was stuck in 1st gear, and I was unable to manually shift. oThis occurred while driving, creating another unsafe situation. oThe vehicle was again taken to the dealer for repair, and to date, I have not been informed of the root cause. Actions Taken: The vehicle was brought to Sarhan, UAE (Sharjah), Al Ghandi Auto after the first incident. Despite inspections and repair attempts, the issue has recurred, indicating it was not resolved. And I am prepared to provide photographic or video evidence if necessary. Additional Context: •The vehicle is less than one year old and has been regularly serviced on time at authorized centers. The recurring issues strongly indicate an underlying reliability or manufacturing defect. Due to the severity and recurrence of these failures, I refuse any further repair attempts. I formally request either a full refund or a replacement vehicle, as this is unacceptable for a new car. Please acknowledge receipt of this complaint promptly and advise on the next steps for a swift resolution. Sincerely, [XXX] Phone: [XXX] Email: [XXX] Location: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ELECTRICAL SYSTEM

Subject: Urgent Safety Complaint Dear GMC Customer Service, I hope this message finds you well. I am formally reporting a serious safety issue with my GMC vehicle. The car has experienced multiple dangerous incidents due to likely electrical or software faults, losing power suddenly on two occasions while driving. This is especially concerning given the low mileage of 20,000 km and that the vehicle is still under warranty. Vehicle Information: •Model: GMC Sierra SLE, 2024 •VIN: [XXX] •Current Mileage: 20,000 km Description of the Problem & History: 1.First Incident (At 3,000 km): oThe vehicle completely shut down due to an electrical or system software issue while driving. oThe vehicle was towed to the dealer and held for over two weeks for repairs. 2.Second Incident (Recently): oThe vehicle again lost functionality; the gear was stuck in 1st gear, and I was unable to manually shift. oThis occurred while driving, creating another unsafe situation. oThe vehicle was again taken to the dealer for repair, and to date, I have not been informed of the root cause. Actions Taken: The vehicle was brought to Sarhan, UAE (Sharjah), Al Ghandi Auto after the first incident. Despite inspections and repair attempts, the issue has recurred, indicating it was not resolved. And I am prepared to provide photographic or video evidence if necessary. Additional Context: •The vehicle is less than one year old and has been regularly serviced on time at authorized centers. The recurring issues strongly indicate an underlying reliability or manufacturing defect. Due to the severity and recurrence of these failures, I refuse any further repair attempts. I formally request either a full refund or a replacement vehicle, as this is unacceptable for a new car. Please acknowledge receipt of this complaint promptly and advise on the next steps for a swift resolution. Sincerely, [XXX] Phone: [XXX] Email: [XXX] Location: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

The instrument cluster shorted and was blank with no access to any gauges or speedometer. No functionality

ELECTRICAL SYSTEM

The instrument cluster shorted and was blank with no access to any gauges or speedometer. No functionality

STRUCTURE:BODY

The top front grill became detached at highway speeds

ENGINE

I received a recall notice for my 2024 GMC Sierra Denali Ultimate (6.2L engine), related to defective lifters that can cause engine damage. My truck was built in April 2024, and I've been told by some sources that certain 2024s may have the updated lifters, but neither my dealership nor GMC will confirm whether my truck is affected or safe. I’ve asked multiple times for VIN-specific confirmation of the engine components — no one has been able to tell me if my vehicle has the faulty parts or not. I was told to just keep using the oil they recommend or wait for a diagnostic tool GM hasn’t even released yet. That’s not enough. I’m planning to take my family, including my grandchildren, on a long road trip soon, and I don’t feel safe putting them in this truck without answers. For a vehicle that cost over $85,000, I shouldn’t be left guessing whether the engine could fail on the road. I’m filing this complaint because GM is not giving me a straight answer, and I think this is a serious safety concern.

ENGINE

I learned 2 weeks ago my 6.2L was part of the recall. I took a business trip in the truck with about 19,000 miles last week. I got home Friday noon. Truck was parked from Friday till this afternoon. Went to remote start it, it started, was misfiring and stalled, I could hear what I thought was a rod clanking. I got in the truck, started it with the start button, same thing. Had my 19yr old son start it with me laying on the driveway listening. It was clearly a rod or bearing making noise. I’m fortunate this happened in my driveway and not on my hour drive Friday. Truck will be towed to dealer Monday 6/2, but I suspect this motor has failed with 20,000 miles for the same reason it was recalled.

POWER TRAIN

Vehicle jolts forward when coming to a complete stop causing vehicle to move forward unintentionally.

ENGINE

Manufacturer Recall Number N252494003 NHTSA Recall Number25V274 Recall Status Recall Incomplete, remedy not yet available Summary General Motors has decided that a defect which relates to motor vehicle safety of 2024 model year GMC Sierra 1500, equipped with the 6.2L V8 gas engine (RPO L87). The connecting rod and/or crankshaft engine components in these vehicles have manufacturing defects that can lead to engine damage and engine failure. Safety Risk When the engine fails during vehicle operation, the vehicle will lose propulsion, increasing the risk of a crash. GM HAS YET TO CORRECT THIS SAFETY ISSUE WITH MY GMC SIERRA. THEY HAVE FAILED TO CORRECT IN A TIMELY MANNER.

ENGINE

Friday, May23,2025, 5:00 pm Driving on interstate at 65mph, entering work zone as 3 lanes merged into 2. The vehicle slowing down to allow traffic to merge. Dash display said push start button again, no engine rpms, Pushed start button, nothing happened. The vehicle came to a complete stop. pushed button several times, attempted to shift vehicle into park and or neutral, Did not no what gear I was in. Dash display said not conducive to shifting at this time. After several attempts to restart truck, it did start. Put it in drive, accelerated past 65mph. vehicle died immediately. able to change lanes while coasting and got off highway. Never restarted, transmission locked and parking brake locked. Tow operator called, dragged onto flatbed, no wheels turning. Towed to Dealer. Potential for accident was very high, the vehicle had 4 passengers including a child. No warning what was about to happen an no clue what to do. Pre Memorial Day traffic including work traffic in construction zone. Is still under original manufacturer's warranty with a little over 11,000 miles . Dealer confirmed the Tuesday. May 27, 2025 the engine failure and contacted GM regarding the recall.

VISIBILITY/WIPER

I was going home after work on labor day, when l heard a noise on my roof. I opened the sunscreen window and l heard what sounded like a gunshot and the sunroof exploded raining down glass on my face.

STRUCTURE

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving 70 MPH, the top grille cover detached from the vehicle. The contact immediately proceeded to pull over and used a zip tie to the secure the grille cover. There was no warning light illuminated. The local dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The approximate failure mileage was 35,000.

POWER TRAIN

New truck with only 5K miles had the check engine light come on. Sluggish/low acceleration and unable to put into reverse. Towing required to service center.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

POWER TRAIN

Transmission valve body failure 10,672 miles ..

FUEL/PROPULSION SYSTEM

On [XXX] this vehicle was in Blue Cruise on [XXX] in Louisiana when it without warning coasted to a stop after the engine quit. Cruise lights remained active, no other lights were illuminated, and the vehicle simply rolled to a stop. La. DOT assisted. The vehicle was towed (complicated that once placed into park, and the engine would not restart, the vehicle cannot easily be placed in neutral to be towed). The vehicle was trailered some ~50 miles and sits at Rainbow NorthShore GMC in Covington, La. This is a series, life threatening situation that all vehicles need be removed from the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6

POWER TRAIN

On [XXX] this vehicle was in Blue Cruise on [XXX] in Louisiana when it without warning coasted to a stop after the engine quit. Cruise lights remained active, no other lights were illuminated, and the vehicle simply rolled to a stop. La. DOT assisted. The vehicle was towed (complicated that once placed into park, and the engine would not restart, the vehicle cannot easily be placed in neutral to be towed). The vehicle was trailered some ~50 miles and sits at Rainbow NorthShore GMC in Covington, La. This is a series, life threatening situation that all vehicles need be removed from the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6

ENGINE

On [XXX] this vehicle was in Blue Cruise on [XXX] in Louisiana when it without warning coasted to a stop after the engine quit. Cruise lights remained active, no other lights were illuminated, and the vehicle simply rolled to a stop. La. DOT assisted. The vehicle was towed (complicated that once placed into park, and the engine would not restart, the vehicle cannot easily be placed in neutral to be towed). The vehicle was trailered some ~50 miles and sits at Rainbow NorthShore GMC in Covington, La. This is a series, life threatening situation that all vehicles need be removed from the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

I was traveling on the interstate, going a little over 70 MPH as I was passing a tractor and trailer. There were no other vehicles in front of me. Suddenly the truck jerked like the breaks were being applied and my speed was quickly reduced to around 60 MPH. The heads up display showed a crash alert orange symbol. I pushed the gas to try to get back up to speed but the truck would not accelerate and the speed kept dropping. I pulled over to the berm and came to a stop. There was a message on the message center but it went away before I could read it with everything else happening. I put the truck in park and waited a minute then I pulled back out and was able to get the truck back up to speed and home. I plan to contact my dealer tomorrow. The ruck was involved in an accident that damaged the front in earlier this year so I believe some or all of those sensors have been replaced. This is the first issue we’ve had since purchase. If there would have been a vehicle following behind me, the rapid breaking/deceleration could have caused an accident. Also the inability for me to regain my speed when traveling on an interstate was a danger to myself and others.

ENGINE

starting in June of 2024 at 6500 miles my truck started exhibiting loud exhaust drones and severe vibrations coming through the dash, floorboard and steering column on excelleration. The truck has been in repair 7 times in the past 11 months and multiple parts have been changed. I learned that there are thousands of General Motors 1500 trucks equipped with the 3.0 LZ0 Duramax diesel engine exhibiting the same symptoms. A General Motors Field Engineer found Broken exhaust bracket studs at the engine block caused by exhaust alignment and engine/transmission mount stress from worn components. These trucks are coming from the factory this way and continues with 2025 model year. My son owns a 2025 GMC AT4X 3.0 LZO and has the exact same symptoms.

ENGINE

General Motors has decided that a defect which relates to motor vehicle safety exist in my 2024 model year GMC Sierra 1500 vehicle equipped with the 6.2L V8 gas engine (RPO L87). The connecting rod and/or crankshaft engine components in these vehicles have manufacturing defects that can lead to engine damage and engine failure. If the engine fails during vehicle operation, the vehicle will lose propulsion, increasing the risk of a crash !!!! After contacting my local GM dealers, three of them, NONE OF THEM CAN OR KNOW HOW TO REPAIR THIS LIFE SAFETY ISSUE with my vehicle. Please direct GM to buy back my 2024 GMC Sierra SLT vehicle. v/r [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

UNKNOWN OR OTHER

TWICE in the past month +. On [XXX] my wife and I were on our way to a family wedding and I was driving approx 75 MPH on [XXX]. I don't recall if I had cruise control on or not as I rarely use it. There was no vehicle was in front of me for hundreds of yards yet all of a sudden the vehicle started to brake very hard. I accelerated as I did not know what was going on and I had a car in back of me that started to gain. THEN last Friday ([XXX}) with my wife following me in her car on [XXX] through Ellicott City MD I was traveling at approx 25-30 MPH through a very small historic town when all of a sudden the same [XXX] thing happened. DEF no CC on . When we got to our destination I asked my wife if she saw my brakes come on suddenly?. She replied yes and said she saw the truck dip hard. I told her the brakes did it again. She said I should call the dealer. I did not as they are USELESS! THEN the electronics. On Star has a catalog of my complaints. The radio selections I make just disappear from the screen: Apple Car Play disappears from the touch screen and just goes dark. I have to stop the truck..(per on-star) open the door.. get out.. lock it.. wait 2 minutes.. get back in .. restart the truck, and this re-sets the computers(s). RIDICULOUS! I do not have Sirius but the radio goes dark often for about 2-3 seconds., then comes back on. I was told it is my I-Phone is causing this. [XXX]! What does my phone have to do with AM/FM radio?? I was told by GMC there is a patch to update the software. Koons GMC told me there was no such patch nor recall. I paid nearly $80,000 for this piece of [XXX]! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

TWICE in the past month +. On [XXX] my wife and I were on our way to a family wedding and I was driving approx 75 MPH on [XXX]. I don't recall if I had cruise control on or not as I rarely use it. There was no vehicle was in front of me for hundreds of yards yet all of a sudden the vehicle started to brake very hard. I accelerated as I did not know what was going on and I had a car in back of me that started to gain. THEN last Friday ([XXX}) with my wife following me in her car on [XXX] through Ellicott City MD I was traveling at approx 25-30 MPH through a very small historic town when all of a sudden the same [XXX] thing happened. DEF no CC on . When we got to our destination I asked my wife if she saw my brakes come on suddenly?. She replied yes and said she saw the truck dip hard. I told her the brakes did it again. She said I should call the dealer. I did not as they are USELESS! THEN the electronics. On Star has a catalog of my complaints. The radio selections I make just disappear from the screen: Apple Car Play disappears from the touch screen and just goes dark. I have to stop the truck..(per on-star) open the door.. get out.. lock it.. wait 2 minutes.. get back in .. restart the truck, and this re-sets the computers(s). RIDICULOUS! I do not have Sirius but the radio goes dark often for about 2-3 seconds., then comes back on. I was told it is my I-Phone is causing this. [XXX]! What does my phone have to do with AM/FM radio?? I was told by GMC there is a patch to update the software. Koons GMC told me there was no such patch nor recall. I paid nearly $80,000 for this piece of [XXX]! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. The VIN was not available. VIN tool confirms parts not available.

ENGINE

Engine failed. Driving on the interstate and vehicle lost all power. Problem confirmed by Jim Glover Cheverolet. Engine inspected and confirmed by dealership. No warning at all.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

EXTERIOR LIGHTING

When in a dark area with little to no lights the backup camera is unusable. The taillights/reverse lights do not put off enough light to provide the camera with the lighting it needs to see behind the vehicle in dark situations. If I am in an urban area with a lot of light pollution the camera works fine, but not when I am in a rural are with no lights.

POWER TRAIN

Metal fragments in engine oil. Vehicle has 9500 miles. Manufacturer tells me to keep driving until it fails.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

UNKNOWN OR OTHER

Purchase the truck [XXX]. In January of 2025 it started to feel like the engine was slipping. Near the end of February, it was getting worse and the locks started locking/unlocking on their own. The vehicle stalled two separate times while driving on a main road. The first couple days of March, the car stalled, again on the road while the locks went crazy. Then, on [XXX], after I had pulled out of my driveway in my neighborhood, my car completely shut down. We had to have the truck towed to Coyle GMC, in Clarksville, Indiana. And, as of May 1st, it is still there. We have been told they need some cap for the transmission and they don't know when they will get it. They offered to give us a new transmission, but they don't know when they'll get it. I am making car payments on a car that I have not had since May 7th. Unfortunately, because I drive my car for work, it had it's 32000 miles on it, so I can't turn it in for the lemon law. I'm very lucky that my son and I were not injured when the car stalled in the middle of the road. This is an ongoing issue with GMC, and I think it should be illegal that they were selling these trucks. I have a brand new truck that I haven't driven in 2 months. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE

Purchase the truck [XXX]. In January of 2025 it started to feel like the engine was slipping. Near the end of February, it was getting worse and the locks started locking/unlocking on their own. The vehicle stalled two separate times while driving on a main road. The first couple days of March, the car stalled, again on the road while the locks went crazy. Then, on [XXX], after I had pulled out of my driveway in my neighborhood, my car completely shut down. We had to have the truck towed to Coyle GMC, in Clarksville, Indiana. And, as of May 1st, it is still there. We have been told they need some cap for the transmission and they don't know when they will get it. They offered to give us a new transmission, but they don't know when they'll get it. I am making car payments on a car that I have not had since May 7th. Unfortunately, because I drive my car for work, it had it's 32000 miles on it, so I can't turn it in for the lemon law. I'm very lucky that my son and I were not injured when the car stalled in the middle of the road. This is an ongoing issue with GMC, and I think it should be illegal that they were selling these trucks. I have a brand new truck that I haven't driven in 2 months. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ELECTRICAL SYSTEM

Purchase the truck [XXX]. In January of 2025 it started to feel like the engine was slipping. Near the end of February, it was getting worse and the locks started locking/unlocking on their own. The vehicle stalled two separate times while driving on a main road. The first couple days of March, the car stalled, again on the road while the locks went crazy. Then, on [XXX], after I had pulled out of my driveway in my neighborhood, my car completely shut down. We had to have the truck towed to Coyle GMC, in Clarksville, Indiana. And, as of May 1st, it is still there. We have been told they need some cap for the transmission and they don't know when they will get it. They offered to give us a new transmission, but they don't know when they'll get it. I am making car payments on a car that I have not had since May 7th. Unfortunately, because I drive my car for work, it had it's 32000 miles on it, so I can't turn it in for the lemon law. I'm very lucky that my son and I were not injured when the car stalled in the middle of the road. This is an ongoing issue with GMC, and I think it should be illegal that they were selling these trucks. I have a brand new truck that I haven't driven in 2 months. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

FUEL/PROPULSION SYSTEM

I have received the notice about the recall and now I am just worried because I have a wife and two-year-old child in my truck. I don't want the engine issue to happen while they are in the truck and increases the risk to get into an accident if the engine fails. I have tried to schedule an appointment with my dealership and from the date I received notice on 04/28/2025. They stated I have to call back in two weeks which should be unacceptable because how about if the engine fails within the two weeks and causes even more issues for me and my family. This should be approached much quicker and fix the matter asap.

ENGINE

I have received the notice about the recall and now I am just worried because I have a wife and two-year-old child in my truck. I don't want the engine issue to happen while they are in the truck and increases the risk to get into an accident if the engine fails. I have tried to schedule an appointment with my dealership and from the date I received notice on 04/28/2025. They stated I have to call back in two weeks which should be unacceptable because how about if the engine fails within the two weeks and causes even more issues for me and my family. This should be approached much quicker and fix the matter asap.

POWER TRAIN

Q1: Engine lost propulsion Q2: I was stuck in middle of highway Q3: Yes, engine needs replacement Q4: Dealer Q5: No, check engine light came on once lost of power

FUEL/PROPULSION SYSTEM

On April 21, 2025 around 11pm, I was entering my neighborhood, I was slowing to a stop, the truck shut off, shifted to neutral on its own. Clusters were still on though, no error codes other than instruction to turn ignition back on. I tried for over 20 minutes with no luck. I placed the truck in park and shut it off after that I couldn't get it change back to neutral. Was on the phone with onstar and recorded it. Eventually it turned on with check engine light, made it home. On April 22, 2025, I dropped it off at Classic Buick GMC 16835 Katy Fwy, Houston, Texas 77094. Service rep informed me I will require a new engine as there are metal shavings in the oil filter as a result of worn cam shaft bearings. They have had the truck at their shop since the incident.

ENGINE

On April 21, 2025 around 11pm, I was entering my neighborhood, I was slowing to a stop, the truck shut off, shifted to neutral on its own. Clusters were still on though, no error codes other than instruction to turn ignition back on. I tried for over 20 minutes with no luck. I placed the truck in park and shut it off after that I couldn't get it change back to neutral. Was on the phone with onstar and recorded it. Eventually it turned on with check engine light, made it home. On April 22, 2025, I dropped it off at Classic Buick GMC 16835 Katy Fwy, Houston, Texas 77094. Service rep informed me I will require a new engine as there are metal shavings in the oil filter as a result of worn cam shaft bearings. They have had the truck at their shop since the incident.

ENGINE

I had an engine failure with a complete loss of power while driving on a state highway early on 12/13/24. No lights, hazard lights, nothing would turn on for over 10 minutes, then once started my truck said "shut off engine, low oil pressure". There was a bearing failure that sent metal fragments all through the engine. My truck went into the dealership on 12/17/24 and i received it back with a new engine on 4/18/25. It has the same L87 engine with the same recommended oil as before the recall. I asked GMC to buy it back from me because it's neither dependable or safe after what happened. I was refused without being given a reason.

ENGINE AND ENGINE COOLING

The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted and confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

ELECTRICAL SYSTEM

While exiting the highway and transitioning into a turn lane, my 2024 GMC Sierra AT4 (with 12,887 miles) suddenly and completely shut down without any prior warning. All vehicle systems—including electrical—failed simultaneously. This included the dashboard, steering assistance, and emergency lights, which significantly compromised my safety. I was unable to alert surrounding drivers or move the vehicle out of the traffic lane. There were multiple cars behind me, and I was placed in an extremely unsafe situation due to the sudden loss of control and inability to signal or restart the vehicle. I immediately contacted emergency services, and a police officer arrived approximately 10 minutes later to assist. Roadside assistance later pulled diagnostic code P0016 from the truck’s computer. I have since learned that this code corresponds to a known engine timing defect and is the subject of a recent GMC recall issued just days prior to the incident. The failure occurred without any warning lights, messages, or symptoms beforehand. The vehicle is now with a GMC dealer and is available for inspection upon request. To my knowledge, the issue has not yet been independently confirmed, but I believe it is directly connected to the recalled component.

FUEL/PROPULSION SYSTEM

While exiting the highway and transitioning into a turn lane, my 2024 GMC Sierra AT4 (with 12,887 miles) suddenly and completely shut down without any prior warning. All vehicle systems—including electrical—failed simultaneously. This included the dashboard, steering assistance, and emergency lights, which significantly compromised my safety. I was unable to alert surrounding drivers or move the vehicle out of the traffic lane. There were multiple cars behind me, and I was placed in an extremely unsafe situation due to the sudden loss of control and inability to signal or restart the vehicle. I immediately contacted emergency services, and a police officer arrived approximately 10 minutes later to assist. Roadside assistance later pulled diagnostic code P0016 from the truck’s computer. I have since learned that this code corresponds to a known engine timing defect and is the subject of a recent GMC recall issued just days prior to the incident. The failure occurred without any warning lights, messages, or symptoms beforehand. The vehicle is now with a GMC dealer and is available for inspection upon request. To my knowledge, the issue has not yet been independently confirmed, but I believe it is directly connected to the recalled component.

ENGINE

While exiting the highway and transitioning into a turn lane, my 2024 GMC Sierra AT4 (with 12,887 miles) suddenly and completely shut down without any prior warning. All vehicle systems—including electrical—failed simultaneously. This included the dashboard, steering assistance, and emergency lights, which significantly compromised my safety. I was unable to alert surrounding drivers or move the vehicle out of the traffic lane. There were multiple cars behind me, and I was placed in an extremely unsafe situation due to the sudden loss of control and inability to signal or restart the vehicle. I immediately contacted emergency services, and a police officer arrived approximately 10 minutes later to assist. Roadside assistance later pulled diagnostic code P0016 from the truck’s computer. I have since learned that this code corresponds to a known engine timing defect and is the subject of a recent GMC recall issued just days prior to the incident. The failure occurred without any warning lights, messages, or symptoms beforehand. The vehicle is now with a GMC dealer and is available for inspection upon request. To my knowledge, the issue has not yet been independently confirmed, but I believe it is directly connected to the recalled component.

ENGINE

On April 23rd, while traveling, I began hearing a loud, metal on metal knock. My truck began to lose all pulling power. I had no engine warnings, no check engine lights or any other indicator of engine trouble. I pulled to the side of the road and exited the vehicle. It was then I realized it was my engine making the noise. I have since had it towed to the dealer where it sits while I wait to hear back from the service department a final diagnosis. I was told this was most likely a rod or bearing. On Friday April 25, I was told of the recall. I was told I would probably need a new engine but they haven't been instructed on what the next step would be from GM.

FUEL/PROPULSION SYSTEM

I leased a 2024 GMC Sierra 1500 Denali Ultimate with the 6.2L V8 engine. The vehicle experienced multiple engine-related issues over time, including stalling on [XXX], and again in early 2025. On [XXX], the engine completely failed while I was driving on the highway. The truck suddenly shut down, forcing me to pull over in a dangerous situation. It was towed to North Bay Cadillac, where they confirmed the engine needed to be fully replaced. They also stated this issue is related to a known engine defect affecting 6.2L engines across GM vehicles. The vehicle has been in the shop for extended periods and is currently undergoing repairs estimated to take over a month. GM provided a loaner vehicle after 12 days, but I remain financially responsible for a defective truck that posed a serious safety risk. No warning lights were present before the failure. I am requesting that this issue be formally documented due to the severity of the safety hazard and the widespread nature of this engine problem. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE

I leased a 2024 GMC Sierra 1500 Denali Ultimate with the 6.2L V8 engine. The vehicle experienced multiple engine-related issues over time, including stalling on [XXX], and again in early 2025. On [XXX], the engine completely failed while I was driving on the highway. The truck suddenly shut down, forcing me to pull over in a dangerous situation. It was towed to North Bay Cadillac, where they confirmed the engine needed to be fully replaced. They also stated this issue is related to a known engine defect affecting 6.2L engines across GM vehicles. The vehicle has been in the shop for extended periods and is currently undergoing repairs estimated to take over a month. GM provided a loaner vehicle after 12 days, but I remain financially responsible for a defective truck that posed a serious safety risk. No warning lights were present before the failure. I am requesting that this issue be formally documented due to the severity of the safety hazard and the widespread nature of this engine problem. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

STRUCTURE:BODY

Twice in the last few weeks my tailgate has opened while driving the vehicle. Prior to this, the tailgate has never dropped while driving since the vehicle has been new. The tailgate was not down whenever I left, but it was down whenever I got to my location. I did not hit the tailgate button to drop the tailgate at any time before during or after this trip. On the one occurrence, items were lost from the bed of the truck, which could cause a road hazard for other motorists. There were no warning lights or notifications that the tailgate was open on the driver information center or elsewhere. I have service scheduled with the dealer on 5/2/25 to inspect the vehicle. I am unsure at what point in the trip the tailgate opened.

STRUCTURE:BODY

At approximate 36700 miles. Upper top molding piece next to the grill, flew off while driving down the highway at 75mph hit my windshield and cracked it. Lucky no one was flowing me. This is the second one that's has broken. The first time was driving in South Dakoda the day after I purchased the truck and one side broke so I was able to stop at a truck stop and duck tape it until I was able to take it to the dealer. This seams to be a flaw, because read this has happen to multiple truck of the same model.

ENGINE

In the midst of driving my vehicle, soon after exiting the expressway. I received a notification across the dashboard stating to press the brake to start engine. It was totally confusing because I was actually driving and doing so at a speed of approximately 45 miles per hour because I just exited the freeway. Then I noticed the car would not accelerate. At that point I realized that my car had shut down on me while in the midst of driving. I had to very cautiously maneuver my way through traffic to the side of the road where I parked and called onstar for help. This was a very scary moment because I felt as if I could have very easily caused an accident and injured or cost the life of myself or an innocent person. The engine shut down was not evident because all the dashboard lights were still functioning as normal. I don't feel safe driving the vehicle and would very much like to replace with something else, but I feel stuck with it. Dealership says that the vehicle depreciation for one year was $10,000.00 and that I will have to roll that 10k into the price of any new vehicle if I wanted to get out of the current lease. That makes the purchase of newer, safer vehicle unaffordable for me, so again I feel stuck driving something that could have very easily cost me my life.

ENGINE

The contact owns a 2024 GMC Sierra 1500. The contact stated while stopped at an intersection attempting to make a left turn, the vehicle lost power and the infotainment center failed to operate. The contact stated that the vehicle was on the left side of the roadway waiting for Roadside Assistance for the vehicle to be towed to the dealer. A dealer was contacted. The vehicle was towed to the dealer and was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and opened a case. The approximate failure mileage was 50,000.

ENGINE

Engine exploded. No warning just quit running while cruise control set, just had a thump and started to slow down as engine quit running. Caused a problem as road had no shoulder. Had to be towed to dealer for engine replacement.

ENGINE

Vehicle was purchased new in December 2023. In January 2024, with 110 miles on the vehicle the engine blew. Took over a month to get a new engine installed. In March 2025, with 14,500 miles on the vehicle, the engine blew again, This time i was traveling on a busy New York parkway with my [XXX] grandson. Luckily i was able to coast off the parkway without incident. I am now still awaiting a third engine to be installed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

STEERING

I bought this new vehicle from Diamond Chevrolet in Auburn, MA, in November 2024. The truck currently has approximately 10,000 miles on it. On two separate and distinct instances, the truck suffered a complete loss of power steering while driving on the highway. In both instances, the issue persisted until I turned the vehicle off. Numerous warning indicators were illuminated on the dashboard (Service Power Steering, Drive with Care, Service ESC, etc). A loss of power steering is a significant safety defect, and it was hard to steer the truck at lower speeds. The dealership and General Motors were able to replicate the issue and replace the entire power steering rack during the first instance of power steering loss. Currently, the vehicle is still being diagnosed by the dealership and General Motors for the current yet similar issue. The issue is intermittent but poses a significant public safety risk to the consumer and general motoring public.

POWER TRAIN

# 11648853 issue started on [XXX] I just experienced the same issue yesterday, and left it at dealership. Transmission fails to shift, upon entering highway, and concerned about being struck from behind. GMC dealer claimed to have addressed the issue at 4785 miles, and now 4 weeks later, at 5196 the same issue started again. I felt a slight shudder, and then loss of power, and "Reduced Acceleration Drive with Care" came on instrument panel, along with check engine light on. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE

As I was driving down the feeder road of a major highway, the light (press brake to start engine) came on. I was traveling around 55 miles per hour. I pressed the brake and pressed the start button but nothing happened. At this point I was coasting as the engine had died. The radio and electrical system were fully operational. I tried restarting the engine several times while coasting along the busy feeder road. I finally pulled into the right side lane (there was no shoulder) and applied the brakes. Once fully stopped, I was not able to start the engine. I called my GMC dealer for the name of a tow truck. The tow was able to pick up my truck about 45 minutes later. I am still waiting on a new engine from GMC with no time update from my dealer. This incident happened on 03/03/2025.

ENGINE

Experienced catastrophic engine failure while driving down the highway. Was able to coast to a turning lane in an intersection then once I came to a stop my truck proceeded to go into park and was not able to be moved. Engine would no longer start/turn over and vechile remained in park without begin able to go into neutral so had to wait for roll back tow truck to load my truck while sitting in the middle of a busy road with no way to move.

ELECTRICAL SYSTEM

Driving on the highway, moving to pass another vehicle, engine shut off forcing me to coast to the shoulder. No warnings and didn't notice loss of power until I saw that the vehicle had been shifted into neutral. Had 2 kids in the truck and could not get GMC service department on the phone, had to walk up an onramp in order to get my kids home with me in an Uber. This is a 2024 6.2L GMC with only 13,000 miles. Service department took over a week to check initial issues, said it was a fuse block which they replaced. Did not resolve the issue, then it was the starter, which did not resolve the issue, after 2 weeks they told me the engine was locked up due to internal failure and it will be several months before the truck is operable. GM has stated they the issue needs to occur 4 times before a buyback would be considered.

ENGINE

Driving on the highway, moving to pass another vehicle, engine shut off forcing me to coast to the shoulder. No warnings and didn't notice loss of power until I saw that the vehicle had been shifted into neutral. Had 2 kids in the truck and could not get GMC service department on the phone, had to walk up an onramp in order to get my kids home with me in an Uber. This is a 2024 6.2L GMC with only 13,000 miles. Service department took over a week to check initial issues, said it was a fuse block which they replaced. Did not resolve the issue, then it was the starter, which did not resolve the issue, after 2 weeks they told me the engine was locked up due to internal failure and it will be several months before the truck is operable. GM has stated they the issue needs to occur 4 times before a buyback would be considered.

ENGINE

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power. No warning light was illuminated. The vehicle was towed to a local dealer, where it was diagnosed that the engine had failed and needed to be replaced. The vehicle was repaired at the contact's expense. The manufacturer was made aware of the failure. The failure mileage was approximately 6,000.

ENGINE

Engine seized.

ENGINE

I purchased the vehicle brand new in October of 2023, since then the vehicle has been to service over 15 times for engine failure, vibration while driving on the highway etc. At times when the vehicle shut down it was without warning.

ENGINE

6.2L engine seized, same bearing issue as everyone else

POWER TRAIN

As I pulled away from a stop sign, my vehicle started surging and went into limp mode, I pulled over to the side of the road to get out of the way of traffic and could not drive in reverse as I tried to park safely on the shoulder of the road. I had to have truck towed and deealership stated there was an issue with the transmission control valve and it would need to be rebuilt. Performed GM TSB 25-NA-014.

ENGINE

My vehicle stalled while driving on the highway. It has been reported by the dealership that the engine seized, with under 18,000 miles.

ENGINE

After 17500 miles and 11 months ownership 6.2ltr engine stopped operations while driving, in traffic and locked up on interstate without warning. Towed to Chevrolet Dealership and disassembled, main crankshaft bearings failed.

ENGINE

My vehicle started rough with rattling and knocking one morning. I contacted my dealer and made an appointment. I received an appointment for about a week out and did not operate the vehicle until that day. Upon bringing the vehicle to the GMC maintenance shop, the vehicle’s engine ceased and had to be towed the remainder of the trip.

POWER TRAIN

My motor seized and shut off while driving 63 mph on a busy highway going up hill. Truck made it to the top of the hill before it shut off and had to coast to a stop on the side of the road. No warning lights or anything. Rpms locked at 3000 and wouldn’t go up or down until the motor shut off. Switched itself to neutral while it was rolling still and wouldn’t allow my to put the truck in park when stopped. Finally locked itself in park and wouldn’t allow to be shifted to neutral. Dealership said the motor seized and ordered a new one but is on back order

ENGINE

My motor seized and shut off while driving 63 mph on a busy highway going up hill. Truck made it to the top of the hill before it shut off and had to coast to a stop on the side of the road. No warning lights or anything. Rpms locked at 3000 and wouldn’t go up or down until the motor shut off. Switched itself to neutral while it was rolling still and wouldn’t allow my to put the truck in park when stopped. Finally locked itself in park and wouldn’t allow to be shifted to neutral. Dealership said the motor seized and ordered a new one but is on back order

ENGINE

On the morning of March 12, 2025, I started experiencing a ticking sound from the engine bay under throttle. I suspected lifter failure and decided to proceed to the dealership that afternoon for repairs. During my commute, the engine started squealing and shuddering and I experienced a severe loss of acceleration which made it almost unsafe to drive on the highway. Upon coming to a stop in traffic, the engine died. I was able to get it restarted and proceeded to continue my trek to the dealership. Upon another traffic stop, the engine died again, at which point I made the decision to exit the highway and continue my journey along the service road. Twice more the engine died when coming to a stop and the 4th time it struggled to restart. I finally decided to pull into a parking lot and as I was backing into a parking space, the engine died its final time and would not crank/turn over. To make matters more difficult, the transmission would not even shift out of "PARK" into "NEUTRAL" for it to be laoded onto a tow truck. Each time I tried to shift out of "PARK" I received a message stating "Conditions for shift not met"

ENGINE

While driving on a 55 mp road [XXX] the truck just stopped running. I had just turned from [XXX] onto [XXX] and had not gotten up to speed. I was only traveling at about 25 mph when the truck seized and stopped. No power to control vehicle. No power and no warning prior to no power. Only 18k miles on the truck and it died and wouldn't restart. It sat in the middle of the road and stayed in the middle of the road for an hour waiting on a tow. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

POWER TRAIN

Truck just made a year old and killed on me in the middle of road. They are saying I need a new engine and maybe transmission. Could not shift truck into neutral, which left me stranded on busy road. For unsafe and had me nervous. Trying to get GMC to buy me out of this vehicle. Had same problem with 6.2 liter prior to this truck. Engine and transmission was replaced. They promised if I bought new truck, I wouldn’t have the issues and here I am again. This is terrible.

ELECTRICAL SYSTEM

Truck just made a year old and killed on me in the middle of road. They are saying I need a new engine and maybe transmission. Could not shift truck into neutral, which left me stranded on busy road. For unsafe and had me nervous. Trying to get GMC to buy me out of this vehicle. Had same problem with 6.2 liter prior to this truck. Engine and transmission was replaced. They promised if I bought new truck, I wouldn’t have the issues and here I am again. This is terrible.

ENGINE

Truck just made a year old and killed on me in the middle of road. They are saying I need a new engine and maybe transmission. Could not shift truck into neutral, which left me stranded on busy road. For unsafe and had me nervous. Trying to get GMC to buy me out of this vehicle. Had same problem with 6.2 liter prior to this truck. Engine and transmission was replaced. They promised if I bought new truck, I wouldn’t have the issues and here I am again. This is terrible.

POWER TRAIN

While driving I experienced a loss of forward momentum, and watched the RPMs go up to 3000, wording came on the dash, but I was in traffic and wasn't able to read. I was able to reach next light about 1/4 mile, and stopped. Mad a left turn and within 200 feet, same issue. I pulled over and called OnStar. Towed to dealer. Dealer put on lift right away, as it was just in for 1st service on Saturday, with 4775 miles. Dealer informed me of a bulletin out for removing transmission pan, and splitting plates to check a ball size for 6th gear, which they found during the computer diagnostic checks. They claim to have a part tomorrow, and will install soon after.

STRUCTURE:BODY

1.During December 2024, noticed the wrap or called grill part at the back of the truck detached 2.On 5th February, got a warning :reduce acceleration with caution, when I pressed gas pedal, could not go faster than 35mph, the truck was shaking really hard. It has been in the dealership waiting for valve body until today 13th March, still no idea when it will be fixed

ENGINE

1.During December 2024, noticed the wrap or called grill part at the back of the truck detached 2.On 5th February, got a warning :reduce acceleration with caution, when I pressed gas pedal, could not go faster than 35mph, the truck was shaking really hard. It has been in the dealership waiting for valve body until today 13th March, still no idea when it will be fixed

VEHICLE SPEED CONTROL

1.During December 2024, noticed the wrap or called grill part at the back of the truck detached 2.On 5th February, got a warning :reduce acceleration with caution, when I pressed gas pedal, could not go faster than 35mph, the truck was shaking really hard. It has been in the dealership waiting for valve body until today 13th March, still no idea when it will be fixed

EXTERIOR LIGHTING

The reverse lights don’t illuminate camera when you’re in a dark parking lot or area. If and when camera is relied on for reverse, you wouldn’t be able to see a person or anything else. It’s a lighting problem. When you are in an area that is lit (dealer parking lot) you can see fine. I also own a 2014 Chevrolet and camera works fine in dark and lit areas.

POWER TRAIN

DEF tank heater, diesel exhaust fluid heater has failed which causes the truck to go into a reduced speed until fixed. GM has no parts to fix the issue! at my dealer. Currently there is three or four trucks waiting on the exact same part, it puts the truck into reduced power and speed until part is replaced

ENGINE

Engine locked up while driving. I was able to get off the highway. Truck would not crank back up. When trying to start it screens would light up then go black. I had truck towed to nearest GM dealership. The GM dealership informed me that the engine was locked up.

ENGINE

Catastrophic Engine Failure

ENGINE

Driving on the highway vehicle installed out in the middle of the road lucky I had enough speed to rush to the median. I heard noise coming from the engine while I was coasting off the median on the median. Try to turn on the vehicle no luck.

POWER TRAIN

Driving on the highway vehicle installed out in the middle of the road lucky I had enough speed to rush to the median. I heard noise coming from the engine while I was coasting off the median on the median. Try to turn on the vehicle no luck.

ENGINE

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving on a main road at 65 MPH, the vehicle experienced a loss of automotive power. There was no warning light illuminated. The contact coasted to a stop in the shoulder lane and allowed the vehicle to sit for several minutes before attempting to restart the vehicle; however, the vehicle failed to start. The vehicle was towed to a local dealer where the vehicle was diagnosed, and the contact was informed that the engine had seized and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 23,000.

POWER TRAIN

The vehicle was traveling over a hill, and it failed to shift gears downwards when traveling over the hill. The vehicle’s RPM’s shot up to 4000+ and jolted the truck forward without pressing the gas pedal. The vehicle made a loud noise and would not accelerate in the middle of the road. The vehicle would only accelerate after giving it minimal gas from the pedal. The truck then failed to accelerate on the entire drive to the destination and failed to enter reverse upon arriving to my destination.

VEHICLE SPEED CONTROL

The vehicle was traveling over a hill, and it failed to shift gears downwards when traveling over the hill. The vehicle’s RPM’s shot up to 4000+ and jolted the truck forward without pressing the gas pedal. The vehicle made a loud noise and would not accelerate in the middle of the road. The vehicle would only accelerate after giving it minimal gas from the pedal. The truck then failed to accelerate on the entire drive to the destination and failed to enter reverse upon arriving to my destination.

ENGINE

Was driving approx 70 MPH when the truck lost power and put itself into neutral. Had to pull over on busy [XXX] in Missoula at 15deg F. Truck display said "restart vehicle". Once pulled over, truck put itself into PARK. Truck would not restart after multiple attempts. Was towed to dealer where they stated the engine may have seized. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

EXTERIOR LIGHTING

Back up camera is almost useless in very dark situations. Back up lights on vehicle wash out the view and all you can see are the red marker lines. Needs either brighter back up lights or a better camera definition. You cannot see a children's bike or other things while trying to back up.

ENGINE

Engine failed at 10,000 miles while driving down the road. No warnings, engine shut off while driving. I pulled over and contacted OnStar. They got me a tow truck to bring the truck back to the dealer the next day. I was told that I needed a new engine and they don’t know when they’re gonna get one in. It could be months. I had to pay for a Rent-A-Car out of my own pocket. The dealer would not cover the cost.

ENGINE

I am beyond frustrated with my newly purchased 2024 GMC Sierra Elevation 1500 5.3l V8. Back in November I was notified to bring my vehicle back to the dealership for a complete engine replacement. Ever since this time I have had continuous problems with the vehicle. One day after receiving my truck back, I noticed that it was running rough and misfiring. When I opened the hood, I observed a bungy cord still attached to the engine. Several weeks after, the check engine light came on and took a week to get back due to sensor issues with engine. Today, after getting off work, I turned on my truck, but I am unable to shift out of park and I am stuck waiting on a tow truck. There has been nothing but issues with this truck since they replaced the engine. I am not sure if the mechanics at Garlyn Shelton GMC in Temple, Texas, are qualified to replace engines. This is a brand new truck and I should not be having these issues. My fear is that these problems are going to continue because they either did not properly install the new engine or there are still defects.

ENGINE

At 14,000 miles the engine seized. Car stopped on a busy highway almost causing a collision with other vehicles

POWER TRAIN

First time it happened was on November 28th 2024 around 8pm, turned de engine on, selected the reverse gear and stepped on the gas, the reverse gear was selected but the gear didn't worked at all. I almost hit a car that was passing on the street. I out the gear on drive and got the message "reduced acceleration". I believe that is a known issue by GM's 10 speed gearbox. The car is at the dealership and they informed me by e-mail that the part transmission valve body is in a "do not sell list". I have concerns about safety because losing power on a 70miles per hour road can be dangerous and not being able to reverse is also very dangerous. There are tons of posts about it in Facebook.

ENGINE

6.2L V8 engine failure

VEHICLE SPEED CONTROL

I have experienced several occurrences of unintended acceleration while operating the vehicle at low speed. Two recent examples; 1) the truck accelerated rapidly while I was driving into my garage, and 2) the truck accelerated suddenly when pulling forward out of a parking spot in the morning shortly after starting the vehicle. In all cases, a hard application of the brake pedal slowed the vehicle. I considered whether this was operator error, possibly engaging cruise control inadvertently while turning the steering wheel, but the incident this morning does not support that potential cause. I have not spoken to the dealer about this issue.

POWER TRAIN

I have experienced several occurrences of unintended acceleration while operating the vehicle at low speed. Two recent examples; 1) the truck accelerated rapidly while I was driving into my garage, and 2) the truck accelerated suddenly when pulling forward out of a parking spot in the morning shortly after starting the vehicle. In all cases, a hard application of the brake pedal slowed the vehicle. I considered whether this was operator error, possibly engaging cruise control inadvertently while turning the steering wheel, but the incident this morning does not support that potential cause. I have not spoken to the dealer about this issue.

POWER TRAIN

The contact owns a 2024 GMC Sierra 1500. The contact stated while driving 74 MPH, the vehicle inadvertently lost motive power, after which the vehicle was unable to accelerate above 25 MPH. The contact was able to pull over to the shoulder of the roadway and turned off the vehicle. After restarting the vehicle, the vehicle returned to normal functionality, but the failure became a regular occurrence. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the shift solenoid valve and that the serial data gateway module needed to be reprogrammed. The vehicle was not repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 24,000.

STRUCTURE:BODY

Since my purchase of the vehicle Dec 2023, the tailgate opens on its own. Usually follows hitting a bump such as the rain gutter entering a store parking area. I have also had it occur while driving down the road. Have been told multiple times by my service personnel they have had same complaints from other Sierra 1500 but have no fix for the problem. They have offered to deactivate the electronic tailgate system but this is unacceptable to me. There is a recall for 2500 models with same issue but not for 1500’s. This makes little sense.

POWER TRAIN

7500 miles and transmission valve body failed. Parts are on back order with no eta.

ENGINE

Since owning my truck new, the vehicle has had numerous issues with loose exhaust and engine components. The truck has had loose catalytic converter bolts, heat shield and exhaust components causing severe vibration in the driveline, dash and floorboard. My son has the same truck 3.0 LZO other than his being a 2025, he has experienced the same issues.

SEAT BELTS

While driving a new 2024 GMC Sierra SLT (13,000), I received a prompt to SERVICE SAFETY RESTRAINT SYSTEM. My airbag lamp also illuminated and is now on. Upon researching this issue, it refers to potential failure of seatbelts and/or airbags. I have an appointment tomorrow at the dealership to have them diagnose the issue.

AIR BAGS

While driving a new 2024 GMC Sierra SLT (13,000), I received a prompt to SERVICE SAFETY RESTRAINT SYSTEM. My airbag lamp also illuminated and is now on. Upon researching this issue, it refers to potential failure of seatbelts and/or airbags. I have an appointment tomorrow at the dealership to have them diagnose the issue.

POWER TRAIN

The transmission would just give out. It also wouldn’t reverse. The cause was a faulty body valve that gm can’t produce fast enough.

ENGINE

6.2 ecotec GM engine failed, it is available for inspection at the dealership. The engine failed while driving with no shoulder to pull over. According to the dealership the main crankshaft bearings failed causing catastrophic failure. The dealership has confirmed and reported to GM on 1/24/25. There was no warning to the failure. I was driving approximately 40mph and lost complete power with no warning whatsoever.

UNKNOWN OR OTHER

Only owned my 2024 gmc sierra 1500 for 5 months close to 10,000 miles on odometer. Transmission valvebody failure. Gm and dealership says no ETA for a replacement part. Im hearing from other customers with same issue part will take 5-6 months for dealership to receive part. I have a brand new truck that im making truck payments on just siting at the dealership waiting for a transmission valvebody. This is unacceptable! There are many many GM customers dealing with this same issue.

ENGINE

was driving on the highway at 55mph and the engine just quit running and thankfully no one was near me and I was able to pull over on the side of the road. All the dash lights stayed on but the truck would not restart,code on dash board said "Conditions not correct for shift" Had it towed to the dealer and they put a new battery in it, but it broke down again on the way home same as before. Now they are telling me I need a brand new engine.

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

1st time Complete failure on my 2024 engine without warning. As I was traveling on the interstate. All of sudden, I lost all power. Mt truck started slowing down on its own. It was very difficult getting out of the way of on coming traffic. Dealership replaced values. 2 months later. Again on the Interstate engine complete failure again. Now take it to dealership. This time I heard a ticking noise. Right after the ticking noise. Engine stop working. Same situation. Trying to get out of the way of traffic. I was stranded over 3 hours.

ENGINE

1st time Complete failure on my 2024 engine without warning. As I was traveling on the interstate. All of sudden, I lost all power. Mt truck started slowing down on its own. It was very difficult getting out of the way of on coming traffic. Dealership replaced values. 2 months later. Again on the Interstate engine complete failure again. Now take it to dealership. This time I heard a ticking noise. Right after the ticking noise. Engine stop working. Same situation. Trying to get out of the way of traffic. I was stranded over 3 hours.

ELECTRICAL SYSTEM

The contact’s son owns a 2024 GMC Sierra 1500. The contact stated that after coming to a complete stop, the “Service Traction Control” message was displayed on the instrument panel. The contact turned off the vehicle and waited for a while before attempting to restart the vehicle; however, the vehicle failed to restart. The contact stated that the “Service Steering Column” message was then displayed on the instrument panel. A dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 28,140.

STEERING:COLUMN

The contact’s son owns a 2024 GMC Sierra 1500. The contact stated that after coming to a complete stop, the “Service Traction Control” message was displayed on the instrument panel. The contact turned off the vehicle and waited for a while before attempting to restart the vehicle; however, the vehicle failed to restart. The contact stated that the “Service Steering Column” message was then displayed on the instrument panel. A dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 28,140.

TRACTION CONTROL SYSTEM

The contact’s son owns a 2024 GMC Sierra 1500. The contact stated that after coming to a complete stop, the “Service Traction Control” message was displayed on the instrument panel. The contact turned off the vehicle and waited for a while before attempting to restart the vehicle; however, the vehicle failed to restart. The contact stated that the “Service Steering Column” message was then displayed on the instrument panel. A dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was 28,140.

ENGINE

Truck with >15000 miles on it suddenly stops on highway (Dec 6, 2024). Engine won't start but all electrical components work, retractable steps, radio, bluetooth etc. When attempted to start, all electric went black and "push to start button again" came on display. Towed to dealer and after 3 days, advisor says it's not the battery but it might be something electrical. After six days I trade this truck in as they "don't" know what is wrong. After I trade they tell me that the truck needs a new engine but don't why. While taking my new 2025 truck in for a computer problem (500 miles) they tell me they found metal shavings in the oil. I find out two weeks later that there might be a problem with 877,710 6.2L engine with the same problem as mine. Sales says he doesn't know what problem is but he says he may be stuck with the truck for 30 days or more so I should trade.

ENGINE

On 01/24/2025, I was driving my GMC Sierra in the express toll lane at approximately 75 mph. The toll lane had two lanes and was enclosed by concrete barriers on both sides with no median or shoulder to pull over. Without warning, the engine suddenly shut off. There were no warning lights, no unusual noises—just complete engine failure. The power steering also stopped functioning, making it difficult to control the vehicle. I immediately shifted into neutral and focused on keeping the wheel steady to avoid triggering the wheel lock, which could have caused me to lose control and crash. I was forced to coast to a stop, barely managing to find a narrow sliver of space on the median of an on-ramp to the express lane. However, even then, my vehicle was still partially blocking the right lane of the express toll lane and partially in the on-ramp. There was nowhere safe to go, no way to restart the truck, and I couldn’t exit the vehicle due to high-speed traffic surrounding me on both sides. I sat in my disabled truck, utterly exposed, fearing for my life as cars sped past me at 70+ mph. I kept imagining the worst—that an inattentive driver would slam into me, causing a catastrophic accident. Thankfully, after several harrowing minutes, a police officer arrived to block traffic behind me, and another cruiser blocked the entrance to the express lane. Only then did I feel a shred of relief. This was one of the most terrifying experiences I’ve ever endured, and I wouldn’t wish it on anyone. Afterward, I learned that my 6.2L L87 engine had spun the main bearing and now requires a complete engine replacement. In researching this issue, I discovered that the NHTSA is already investigating similar failures in vehicles equipped with this engine. Alarmingly, I also spoke with my Uber driver on the way home, who told me he experienced the exact same failure in his 2023 Escalade with the 6.2L engine. Thankfully, his failure occurred at a red light rather than at highway speeds

ENGINE

I was driving on the highway and my truck went black and engine stopped no power to truck. It was very scary. I pulled over and it was in Neutral and somehow got it into park. The car never would turn over. The truck is at midway motors with metal shavings in the engines. They say it locked up and needs replaced. GM is very difficult to work with and won’t give us any information. I’m scared of the truck.

ENGINE

I purchased this vehicle new in August of 2024. Approximately 2 months ago when the temperatures outside temperatures started falling below freezing, I would frequently get a message, "reduced acceleration, drive with care" pop-up on the center screen, and the check engine light would illuminate. This happens almost every time the outside air temperatures are below 28-30 degrees. Occasional the truck engine loses power and acceleration, but not always. This code pops-up regardless of the engine temperatures. It has been to the dealer where I bought it each time, and they state that GMC told them it is normal. They reset the computer, and the check engine light goes out until I run the truck in temperatures below 30 degrees. The dealer has been great with me, but dealer reports GMC will not cover their services under warranty as GMC reports this is normal. This condition happens unannounced and almost all the time in cold temperatures. It has happened at least 12 times. The performance can be a safety issue when this condition comes about, and you're driving in traffic. I opened a case with GMC on Thursday, January 16, 2025. It is case number [XXX]. I spoke with Graham, the customer service representative who reported that this issue will be escalated to the regional CE Manager because of the frequency that this is happening. Graham reported to me that this CE Manager will be in touch within 2 business days which would be Monday, January 20, 2025. I received a call mid-day on Wednesday January 22, 2025 from a woman from General Motors. I was at work at my full-time job and could not speak very long. I asked if she could call me after 4:30 PM when I was done working, and she replied "sure, we can make that happen." She advised me to get my truck to the dealership. My truck has been at the dealership since last week. As I am typing this, I just received a call from a Christian. Please review attached pictures, and call if you need elaboration. [XXX] . INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION AC

ENGINE

Driving on hwy at 65 mph truck shut off without warning and display said shift to neutral and push start. Truck wouldn’t shift and nothing worked. Coasted to the shoulder where I sat for 5-6 hours waiting for a properly equipped tow truck. Motor was seized.

ENGINE

I was driving my truck on Friday, [XXX], at approximately 50 m.p.h. The tires suddenly locked up and skidded momentarily and then released. Then a very loud clanging noise started in the engine. I lost power and coasted to the side of the road. Then the engine stalled. The truck was towed to Keeweenaw Chevy/GMC in Houghton, Michigan. I was later contacted by the Service Department and informed that the engine had indeed blown and a new engine would need to be installed. Engines are on LONG backorder. I was lucky I wasn't traveling 65 m.p.h or on snow covered roads, as this incident could have then resulted in a complete loss of control and hitting a logging truck head on. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINE

While driving my truck it suddenly lost power. The truck had been operating normally with no prior issues before it shut off without warning. The truck was towed to a local dealer where they later told me the engine had seized up and needed to be replaced. The truck is a 2024 model that I had purchased new two months earlier. It only had 4,533 miles on it. I was driving at highway speeds and had to coast into a gas station parking lot. I was able to coast to safety, but losing power at highway speeds certainly increases the chance of having an accident.

ENGINE

The motor seized up, while driving, no warning lights, just died, had towed to the dealership and was told the motor had seized up, it has now been at the dealership for 45 days, I am being told that there is not a new motor available to replace mine

POWER TRAIN

On December 25, 2024, my vehicle completely stalled in the middle of the highway while travelling at 65 mph. Fortunately there were no vehicles travelling in close proximity to me at the time as my speed rapidly decreased. The abrupt stall required me to pull over to the side of the road to attempt to restart. I was unable to restart the vehicle despite numerous attempts. Jump starting was also unsuccessful. I was left stranded 90 miles away from home in freezing temperatures during a snowstorm on Christmas night. My vehicle was towed to a dealership 140 miles from home as GM would not cover the cost of towing to the dealer closest to my home (68 miles away). After numerous phone calls with GM as well as the GM dealer, I was informed 9 days later that my entire engine (6.2L V8) would need replaced. I was also informed that there are two vehicles ahead of mine that require replacement of their engines and that the engines are back-ordered. They have been unable to provide an estimated timeframe on when my vehicle will be returned to me in working condition, stating it "could be months." When I was informed of the need for an engine replacement, I placed a request for a manufacturer repurchase which was ultimately denied the following week. The agent responsible for managing my case informed me that "GMC requires two to three major failures" before they will consider a repurchase approval. The dealership was not able to provide me a loaner vehicle and I was informed that GM only reimburses $44 per day toward a rental vehicle. My occupation and location require reliable transportation in harsh winter conditions so a truck is the only reasonable option. The dealership charges $75 per day to rent a basic truck. Prior to this incident, the vehicle did not have any major issues and received routine maintenance services as recommended by the manufacturer. It was never involved in any accidents. It only had 17,553 miles and was purchased brand new in October 2023.

ENGINE

On December 25, 2024, my vehicle completely stalled in the middle of the highway while travelling at 65 mph. Fortunately there were no vehicles travelling in close proximity to me at the time as my speed rapidly decreased. The abrupt stall required me to pull over to the side of the road to attempt to restart. I was unable to restart the vehicle despite numerous attempts. Jump starting was also unsuccessful. I was left stranded 90 miles away from home in freezing temperatures during a snowstorm on Christmas night. My vehicle was towed to a dealership 140 miles from home as GM would not cover the cost of towing to the dealer closest to my home (68 miles away). After numerous phone calls with GM as well as the GM dealer, I was informed 9 days later that my entire engine (6.2L V8) would need replaced. I was also informed that there are two vehicles ahead of mine that require replacement of their engines and that the engines are back-ordered. They have been unable to provide an estimated timeframe on when my vehicle will be returned to me in working condition, stating it "could be months." When I was informed of the need for an engine replacement, I placed a request for a manufacturer repurchase which was ultimately denied the following week. The agent responsible for managing my case informed me that "GMC requires two to three major failures" before they will consider a repurchase approval. The dealership was not able to provide me a loaner vehicle and I was informed that GM only reimburses $44 per day toward a rental vehicle. My occupation and location require reliable transportation in harsh winter conditions so a truck is the only reasonable option. The dealership charges $75 per day to rent a basic truck. Prior to this incident, the vehicle did not have any major issues and received routine maintenance services as recommended by the manufacturer. It was never involved in any accidents. It only had 17,553 miles and was purchased brand new in October 2023.

UNKNOWN OR OTHER

November 15 I was driving home from work as the truck started jerking. The system was giving me an engine failure drive with caution warning. I pulled over and decided the turn off the truck and turn it back on. Once I turned it back on it was revving on its own. I decided to turn it off again and it stopped revving but the gears would not shift. You were physically able to switch them but as much as you pressed on the gas to reverse it would not. I had to have it towed to the dealership I purchased it at. It has been 3 months and the part that is needed is still on back order. I placed a compliant with GM and they opened a case but nothing has happened yet as far as getting an ETA on the part.

ENGINE

November 15 I was driving home from work as the truck started jerking. The system was giving me an engine failure drive with caution warning. I pulled over and decided the turn off the truck and turn it back on. Once I turned it back on it was revving on its own. I decided to turn it off again and it stopped revving but the gears would not shift. You were physically able to switch them but as much as you pressed on the gas to reverse it would not. I had to have it towed to the dealership I purchased it at. It has been 3 months and the part that is needed is still on back order. I placed a compliant with GM and they opened a case but nothing has happened yet as far as getting an ETA on the part.

ENGINE

Since brand new, the engine makes a significantly loud chirping sound at two occasions. First is every time the fuel saving auto start kicks in to start acceleration. The other is any time you come to a stop from above 25-35 MPH. At around 16 MPH, there is a loud chirping as you decelerate. This appears to be a timing malfunction and is affecting fuel economy. The vehicle has 8,800 miles on it, and it is getting worse. It has been looked at 4 times and has not been identified. I know there was a GM bulletin from 2022 about this 6.2L V8 Engine, but they state it is "normal". I have never heard a normal sound of this kind from an engine. And certainly not on a $75K vehicle. Please investigate and make them correct the issue or replace the engines. people work too hard to afford nice vehicles, and should not have to deal with this issue.

ENGINE

29K and I have metal shavings in the oil/lifter tick failure. T

UNKNOWN OR OTHER

Tailgate comes open without wanting too. Few times I've come to find the truck with the tailgate open, has occurred twice while driving. There is a recall for the same issue with the 2500 and 3500 series GMC Sierra. My truck is a 1500 series GMC. Surely same issue and faulty tailgate lock as the 2500 and 3500 trucks.

ENGINE

Engine started making noises. I had it towed to dealership to get it diagnosed. Dealership called me next morning to get information on what vehicle was doing. I called dealership that same evening and they informed me that the engine locked up on the tech diagnosing the issue, and I was going to need a new engine.

ENGINE

I was waiting in a parking lot to pick up the kids from school. In park, the truck loses power and almost completely shuts down. When it Reva back up there was a horrible hammering noise. I turn the truck off. Then I called the dealership and told them. I cranked it and recorded it for them and then shut it off. Then the tow truck couldn’t tow and it took two hours to get it loaded because of the features locking things down. It has been 29 days before the finally told me it needs a whole new engine. They still will not tell me why though.

ENGINE

My truck was put on an engine oil consumption plan at ~14,000 milee. Then a month later the engine complete seized while i was driving at 60 mph in the middle of southeast Missouri. The dashboard started flashing with a warning saying that I needed to press the start button. The vehicle came to a stop and i was unable to get it to turn over. I currently have a warranty claim with GM amd the vehicleis at Laura GMC in Collinsvill, IL awaiting a replacement engine. I have no confidence in GMs ability to fully resolve the issue. My life has been completely disrupted as a result of their lack of quality controls.

ENGINE

Engine bearing failure, complete loss of power while driving and turning left into oncoming traffic. Bearing failure confirmed by GM Dealer, brass shavings in oil pan.

SEATS

Intermittent problems with various systems freezing up or not working: Windshield wipers freezing for several seconds mid-wipe. Nearly caused accident. Heads up display not retaining settings Seat controls (bladders that inflate deflate) intermittently working/infotainment screen freeze (where seat control is displayed). Lane departure warning inconsistently working (beeping) Radio quits playing for several seconds and screen goes dark Blinker stops blinking and then re-starts 6.2L engine slow/rough idle continuously hunting for stable speed (This is the only problem that is NOT intermittent). At times almost dies. A/C unit stuck on "hot" delivering 92 degree air when outside 72 degrees. Temp set at Low. (No A/C just trying to get fresh outside air in). Vehicle was under recall and control modules "reflashed" before purchased (new). Dealer reflashed which did not solve problems. Dealer cannot duplicate (but they only spend a little time looking at the issue). Has been in shop off/on for about 2 weeks attempting to resolve. Issues on occasion still occuring since Mid October 2024 purchase.

ELECTRICAL SYSTEM

Intermittent problems with various systems freezing up or not working: Windshield wipers freezing for several seconds mid-wipe. Nearly caused accident. Heads up display not retaining settings Seat controls (bladders that inflate deflate) intermittently working/infotainment screen freeze (where seat control is displayed). Lane departure warning inconsistently working (beeping) Radio quits playing for several seconds and screen goes dark Blinker stops blinking and then re-starts 6.2L engine slow/rough idle continuously hunting for stable speed (This is the only problem that is NOT intermittent). At times almost dies. A/C unit stuck on "hot" delivering 92 degree air when outside 72 degrees. Temp set at Low. (No A/C just trying to get fresh outside air in). Vehicle was under recall and control modules "reflashed" before purchased (new). Dealer reflashed which did not solve problems. Dealer cannot duplicate (but they only spend a little time looking at the issue). Has been in shop off/on for about 2 weeks attempting to resolve. Issues on occasion still occuring since Mid October 2024 purchase.

VISIBILITY/WIPER

Intermittent problems with various systems freezing up or not working: Windshield wipers freezing for several seconds mid-wipe. Nearly caused accident. Heads up display not retaining settings Seat controls (bladders that inflate deflate) intermittently working/infotainment screen freeze (where seat control is displayed). Lane departure warning inconsistently working (beeping) Radio quits playing for several seconds and screen goes dark Blinker stops blinking and then re-starts 6.2L engine slow/rough idle continuously hunting for stable speed (This is the only problem that is NOT intermittent). At times almost dies. A/C unit stuck on "hot" delivering 92 degree air when outside 72 degrees. Temp set at Low. (No A/C just trying to get fresh outside air in). Vehicle was under recall and control modules "reflashed" before purchased (new). Dealer reflashed which did not solve problems. Dealer cannot duplicate (but they only spend a little time looking at the issue). Has been in shop off/on for about 2 weeks attempting to resolve. Issues on occasion still occuring since Mid October 2024 purchase.

POWER TRAIN

See attached document for complaint.

POWER TRAIN:AUTOMATIC TRANSMISSION

See attached document for complaint.

POWER TRAIN

On 12-26-24 the transmission on my vehicle failed suddenly going down the highway. Driving down the road a jerking motion and then all of a sudden the vehicle would not shift gears. Luckily the road wasn’t crowed because all of a sudden the vehicle slowed and would not accelerate. If someone had been following me there was no break light indicating I was slowing down. When I returned home I discovered I didn’t have reverse either. If I was in a place I needed to back up I couldn’t have. I took the vehicle into the dealer the same day and they diagnosed the problem was in the transmission. They ordered the part but it isn’t available and don’t know when it would be available. This leads me to think there must be many other transmissions with the same problem as mine. In my case there was no accident but if it had been on a congested highway there could have been.

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

On December 26th 2024, I was travelling 5 mph or less while pulling into a parking space at a restaurant. As I let the steering wheel return to center, my hand hit the Resume button on the left side of the steering wheel and the vehicle immediately began to accelerate. I was able to step on the brake to prevent the vehicle from hitting the wall of the restaurant. The next day on December 27th, 2024, i was able to duplicate the problem. I had set the cruise at 55 mph before I came to a stop at a traffic light. I released the brake and pressed the Resume button and the vehicle immediately accelerated from a dead stop. I've been an automotive mechanic for over 30 years and I've never seen this happen before. It's my understanding that vehicles wouldn't engage cruise control unless the speed was over 35 mph.

POWER TRAIN

On December 13th 2024, I was unable to drive my truck in reverse. I put the truck in neutral and pushed it out of its parking spot. I was able to drive the truck to the GMC dealership for diagnosis. On December 19th, I received a call from the dealership and I was told the transmission valve body was bad. I called on January 2nd 2025 for an update on the repair and was told the valve body was on backorder and they had no ETA on the Part.