2018 HYUNDAI ELANTRA GT

POWER TRAIN

In mid-2024, the vehicle experienced a flashing check engine light. I brought it to Murfreesboro Hyundai (TN), where they confirmed the oil was low and started an oil consumption test. A bearing clearance test (BCT) was also performed and passed. After back-and-forth over several weeks, I was told the oil consumption was within spec, but the dealership stated Hyundai would cover all necessary repairs, including a combustion chamber cleaning, under warranty. I was told this work was completed and the vehicle was returned to me. In July 2025, the exact same flashing CEL returned. I brought the car back to the same dealership, where they again found the oil was 2.5 quarts low. However, this time they claimed no previous combustion cleaning or repairs had been done, and that I would now need to pay over $1,100 out of pocket for the same cleaning that was supposedly already performed — and which they had told me would be covered under warranty. This indicates that the dealership misrepresented completed service work, failed to address a recurring defect, and is now trying to shift the financial burden to me. Hyundai’s claim that oil consumption is not “high enough” to warrant coverage is concerning, especially when the condition continues to damage the engine and cause driveability issues. This appears to be part of a broader known defect affecting Hyundai 2.0L engines. I am requesting that NHTSA investigate Hyundai’s handling of oil consumption, engine misfire, and warranty practices related to the 2018 Elantra GT and similar models.

ENGINE

In mid-2024, the vehicle experienced a flashing check engine light. I brought it to Murfreesboro Hyundai (TN), where they confirmed the oil was low and started an oil consumption test. A bearing clearance test (BCT) was also performed and passed. After back-and-forth over several weeks, I was told the oil consumption was within spec, but the dealership stated Hyundai would cover all necessary repairs, including a combustion chamber cleaning, under warranty. I was told this work was completed and the vehicle was returned to me. In July 2025, the exact same flashing CEL returned. I brought the car back to the same dealership, where they again found the oil was 2.5 quarts low. However, this time they claimed no previous combustion cleaning or repairs had been done, and that I would now need to pay over $1,100 out of pocket for the same cleaning that was supposedly already performed — and which they had told me would be covered under warranty. This indicates that the dealership misrepresented completed service work, failed to address a recurring defect, and is now trying to shift the financial burden to me. Hyundai’s claim that oil consumption is not “high enough” to warrant coverage is concerning, especially when the condition continues to damage the engine and cause driveability issues. This appears to be part of a broader known defect affecting Hyundai 2.0L engines. I am requesting that NHTSA investigate Hyundai’s handling of oil consumption, engine misfire, and warranty practices related to the 2018 Elantra GT and similar models.

ENGINE

It uses a lot of oil with no visible leak or reason. I put new oil in all the time. All the time! For two years since buying it used. Warning light does not come on till it's out. Car is hot, of course, and stops running in the middle of the road. I see there is a recall on some elantras for oil piston seals but not this car. Seems it should be.

UNKNOWN OR OTHER

when i was in the rear seat and closed left side door, i found myself stuck. the window would not go down from switch as well so i could not use outside handle for exit. after climbing to other side of backseat with my physical impairment (difficult in tight space backseat) i exited and checked outer handle the door opened. i then checked child saftey lock switch and it was not in child safety position. i checked the window power switch at driver door main control and window went down but not back up.

ELECTRICAL SYSTEM

when i was in the rear seat and closed left side door, i found myself stuck. the window would not go down from switch as well so i could not use outside handle for exit. after climbing to other side of backseat with my physical impairment (difficult in tight space backseat) i exited and checked outer handle the door opened. i then checked child saftey lock switch and it was not in child safety position. i checked the window power switch at driver door main control and window went down but not back up.

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

when moving during heavy traffic the car, when braking, will suddenly stop or stop heavily at slow speeds. this causes passengers to be jolted as well as following cars. possible rear end collision is the effect as well. passenger safety of accident is a concern. no warning or indication has been shown at dash.

SERVICE BRAKES

when moving during heavy traffic the car, when braking, will suddenly stop or stop heavily at slow speeds. this causes passengers to be jolted as well as following cars. possible rear end collision is the effect as well. passenger safety of accident is a concern. no warning or indication has been shown at dash.

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

On 6/27/24 while starting my car in the morning an ABS failure light came on, various other system failure lights came on and have stayed on since that day including Cruise Control and Auto Hold. My car only had 33,250 miles on it! I purchased for an OBDII Reader hoping the failure was just a Wheel Speed Sensor. Unfortunately, the error code registered in the ECU was C240201 “Motor Failure” I brought in my car to a very reputable Auto repair shop, and for a $139 diagnosis fee, they confirmed that the ABS Motor / Pump had failed. The owner of the Repair Shop HAD NEVER seen a car of this age and such low milage have this failure previously. The estimate for repairs was over $2,000 as Hyundai is asking for $1300 + tax for just the part. I have read from on-line forums other Elantra GT 2018-2020 owners having the same failure and thought it should be reported.

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

On 6/27/24 while starting my car in the morning an ABS failure light came on, various other system failure lights came on and have stayed on since that day including Cruise Control and Auto Hold. My car only had 33,250 miles on it! I purchased for an OBDII Reader hoping the failure was just a Wheel Speed Sensor. Unfortunately, the error code registered in the ECU was C240201 “Motor Failure” I brought in my car to a very reputable Auto repair shop, and for a $139 diagnosis fee, they confirmed that the ABS Motor / Pump had failed. The owner of the Repair Shop HAD NEVER seen a car of this age and such low milage have this failure previously. The estimate for repairs was over $2,000 as Hyundai is asking for $1300 + tax for just the part. I have read from on-line forums other Elantra GT 2018-2020 owners having the same failure and thought it should be reported.