GMC Complaints

Check engine light is coming on, indicating reduced engine power. Took vehicle to GMC dealer and they advised that the repair shop was getting assistance from the GMC Tech line to update a module to correct the issues. I was informed today that the high pressure fuel pump will have to be replaced, along with a hose or pipe to correct the issue. The vehicle has 57k miles on it. Upon researching the issue, I found that this has been a persistent issue with this model vehicle, dating back to 2020. It appears that it has not been resolved and the vehicles could stall or stop at any time. There is currently a class action lawsuit pending on this issue. Please help, this is dangerous

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at 45 MPH, the vehicle stopped unintendedly. The message “Low Oil Pressure - Shutoff Engine” was displayed. The contact stated that the vehicle was towed to an independent mechanic, where it was determined that the failure was due to rod bearing failure. The local dealer was contacted and confirmed that there was no warranty coverage on the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed that there was no warranty coverage. The failure mileage was approximately 105,000.

The contact owns a 2020 GMC Yukon XL. The contact stated that while driving at 35 MPH, there was an abnormally loud ticking sound coming from the vehicle. The driver was able to pull over safely. There were no warning lights illuminated. The vehicle was towed to an independent mechanic who determined that the lifter was stuck in the bore, and there was a misfire in cylinder #7 due to a stuck camshaft. The local dealer was not contacted. The manufacturer was not notified of the failure. The failure mileage was approximately 113,997.

With the cruise set at 55-60 mph the Rpms will jump, along with a slight shudder feeling. Cruise control has turned off a few times due to this. Cruise set at 25mph and would shudder/lunge forward. Torque converter is showing it’s slipping and will need replaced. No check engine lights.

The contact owns a 2017 GMC Sierra 1500. The contact stated that while attempting to start the vehicle, the defrost was turned on, but the defrost failed to function as intended. There was a loud pop, and there was brown and yellow smoke in the rear of the vehicle. The contact turned off the defroster. The vehicle was driven to the shoulder of the roadway. The contact exited the vehicle and inspected it. The contact stated that the rear driver's side sliding glass was fractured. The vehicle was not diagnosed or repaired by an independent mechanic or a dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 90,200.

Very soon after purchase vehicle developed a front end shake and continued to get worse. This happens when pulling out or in stop and go traffic this varies from in intensity and sometimes it can be quite violent shaking the whole vehicle. The car has been to a GM dealership for this problem 3 times now. The first time 9/8/2025 replaced rear axle, the second time 10/20/25 both front axles were replaced. The 3rd time GM engineer Paul Koerner said they are aware of this problem but there is no repair until it is further investigated this was 12/10/25. As of this time there is still no repair but a bulletin has come out document #7036661. This states the customer should continue to drive vehicle I now have 7600 miles on it and it continues to shake every time I pull out. There seems to be no repair in sight and I’m concerned something will finally fail maybe causing a serious situation and about the unknown damage this is causing to the vehicle. I have written a letter to GM corporate about my concerns and asked for vehicle replacement to no avail. I have all the repair orders and documents and would be glad to give them to you as I have tried to upload them and it seems to work but won’t let me continue.

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle shuddered and hesitated, and the transmission was slipping. No warning lights were illuminated. The vehicle was taken to the dealer, where it was diagnosed, and DTC: P2818 “Pressure Control Solenoid H was stuck and the Transmission Control Module (TCM) valve body”. The contact was informed that the part needed to be replaced. The dealer informed the contact to stop driving the vehicle. The vehicle was repaired. The contact stated that months later, the failure reoccurred while driving at an undisclosed speed, and the vehicle shuddered and hesitated, and the transmission started slipping. The vehicle was taken back to the dealer, where it was diagnosed and determined that the torque converter needed to be replaced. The vehicle was repaired, but three months later, the failure reoccurred, and the RPM started fluctuating. The contact called the dealer; however, the vehicle was not inspected or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 3,000.

2024 1500 Denali 3.0 Duramax Diesel engine failed at 57,000 miles. Engine is out of spec per dealer inspection, has an audible ticking noise, an additional audible metal on metal noise, and loss of power. New 3.0 engine is on back order due to a large volume of engine failures and has no ETA on when it will arrive.

The contact owns a 2022 GMC Yukon XL. The contact stated that while driving approximately 45 MPH, the vehicle jerked as if the brake pedal was depressed and failed to accelerate as intended, with the check engine warning light illuminated. The message "Reduced Acceleration - Drive with Care" was displayed. The contact stated that when the vehicle was stopped, the gear shifter was shifted into reverse, but the vehicle failed to respond. The vehicle was towed to the dealer, where it was diagnosed, and determined that there was a failure with the transmission valve. The contact was informed that the transmission valve needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 90,000.

I was driving on the highway with the cruise control engaged. An instruction came on the information center telling me to push the start button, while I was driving at highway speeds. Then the transmission downshifted numerous times violently the last few times. By the tachometer the engine was doing 6000 rpm. I pulled over and the start button would not shut down the engine until about the third time I pushed it. Then it would not restart. I had the vehicle towed to the dealership and they told me that they had gotten the truck to start but that the engine seized while pulling it into the repair bay. I had followed the recall directions that they had sent me for the recall on the 6.2 liter and they said that mine was fine and that I should use thicker oil from now on. I had done that but still had ths failure, which as a person that has worked on mechanical equipment my whole life, this failure is violent.