GMC Complaints

Engine is misfiring. Took it into local mechanic who mentioned he has seen many similar issues and knew there was a recall for similar 2021 Yukon engine issues but for some reason this model was not included. He encouraged me to trade in the vehicle because most likely the engine would need to be replaced (or a $10,000 repair) and it was not save to continue to drive in this condition. I call GMC and they suggested I contact the NHTSA to request that this year and model be added to the recall listing for other similar Yukon engines.

The contact owns a 2016 GMC Sierra. The contact stated that she had noticed the frame had rusted in two places. No warning lights were illuminated. The local dealer was contacted, who confirmed there were no open recalls. The vehicle was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was unknown.

My truck has completely shut down/ loss power on several occasions. Happened when I was l slowing down or completely stopped. Everything goes dark. Had to wait several minutes before truck would start.

In normal operation on Tuesday May 26,2026, the engine experienced catastrophic failure. The engine is the GM L87 6.2 Liter. This was on a highway in the country and I was able to maneuver the truck off the road before an accident occurred. It did leave me stranded and I was required to get it towed on a roll off (It was not drivable) to the dealer where I purchased it. The dealer [XXX] ) inspected my truck and has informed me that the issues with my 2025 Sierra match the issues for the recall GM had for the model years 2021-2025. It will require a new engine, radiator, among many other parts. There weren't any previous warnings. A check engine light only came on once the engine was engine came apart. An oil change on the vehicle by GM was done a month ago. The truck is a 2025 and has approximately 6,600 miles is all. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2019 GMC Yukon. The contact stated that after starting and exiting the vehicle to allow it to warm up, the contact later noticed that the vehicle had turned off. The vehicle was towed to a first mechanic, who was unable to restart the vehicle or determine the cause of the failure. The vehicle was towed to a second mechanic, where it was diagnosed and determined that the engine had failed and needed to be replaced. The vehicle was not repaired due to the cost. The dealer was contacted and provided an estimate for the repair, but the vehicle was not diagnosed or repaired. The contact stated that the dealer's estimate was higher than the mechanic's estimate. The manufacturer was notified of the failure and suggested purchasing a new vehicle. The failure mileage was approximately 170,000.

The contact owns a 2021 GMC Yukon. The contact stated that after restarted the engine and the vehicle did not operate in reverse. During the failure no warning messages had displayed. The vehicle was driven to the local diagnosed that the transmissions needed to be replaced. The manufacturer was notified of the failure, but no assistance was offered. The contact was informed that the VIN was not included in the NHTSA Campaign Number: 24V797000(POWER TRAIN). The contact indicated that the vehicle had experienced that same failure listed in the recall. The failure mileage was 70,000.

After driving my vehicle for a short period of time I stopped to go shopping. When I returned to my vehicle I started it as usual and the check engine light illuminated. I began driving and within 0.25 miles I received an info enter message that stated my vehicle would have reduced acceleration and to please drive safely. My engine fans became noticeably louder and ran the entire trip home (about 15 minutes). After pulling into my driveway I sat in the vehicle and listen to the fans continue to operate. Additionally, my OnStar system, WiFi, and navigation systems quit working. A P1098 Code was returned when using a diagnostic code device. Disconnecting the battery would cause the check engine light to extinguish and for the truck to operate without reduced acceleration; however, OnStar, navigation and WiFi would not work. After shutting off the engine and then restarting the check engine light would once again illuminate and the reduced acceleration message reappeared.

While driving, the vehicle suddenly began running rough, losing power, and displaying engine warning lights. Due to the severity of the issue, the vehicle was towed to a GMC dealership for diagnosis. The dealership diagnosed lifter failure and a cracked cylinder head. The dealership also documented coolant intrusion, oil/coolant contamination, and evidence of internal engine damage. Repairs were attempted, including replacement of the cylinder head and lifter. After the repairs were completed, the vehicle never left the dealership because it continued misfiring on the same cylinder. GM later determined the engine had a failed piston ring and scored engine block requiring complete engine replacement. The vehicle has approximately 55,000 miles, has been properly maintained, and was purchased new. This catastrophic engine failure resulted in loss of power and major internal engine damage at relatively low mileage. I also opened a case directly with GM Customer Assistance regarding this failure. The case involved multiple escalations after the initial repair attempt failed and the vehicle ultimately required full engine replacement. GM ultimately advised that only partial assistance toward the engine replacement would be provided, leaving the customer responsible for a significant portion of the repair cost. I am submitting this complaint because this vehicle appears consistent with the ongoing NHTSA investigation involving GM 6.2L L87 engine failures and loss of motive power.

The contact owns 2014 GMC Sierra 1500. The contact software modification done at a transmission shop, affected the Active Fuel Management not allowing diagnostic. The manufacturer was not notified of the failure. The approximate failure mileage was 210,000

The contact owns a 2022 GMC Sierra 1500. The contact stated while driving, the vehicle decelerated unintendedly and failed to exceed 50 MPH on several occasions. The check engine warning light illuminated, and the message " Reduced Acceleration - Drive With Care" was displayed. The vehicle was taken to the dealer on several occasions, and the OnStar sensors, the fuel injectors and 8 spark plugs were replaced; however, the failure persisted. The vehicle was taken back to the dealer, who retrieved DTCs: P0747, indicating a pressure control solenoid A stuck on failure, and P0700, indicating a transmission control module failure. The dealer determined that the failure was related to GM Special Coverage Number: N242454441 (Momentary Rear Wheel Lock-Up); however, the VIN was not included. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance in adding the VIN to the Special Coverage. The failure mileage was approximately 95,000.