GMC Complaints

The contact owns a 2019 GMC Terrain. The contact stated while driving at an undisclosed speed, the transmission unexpectedly shifted into neutral(N). There was transmission fluid on the ground, and the vehicle became disabled. The vehicle was towed to the dealer, where it was diagnosed with a transmission accumulator leak. The vehicle was not repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 180,400.

The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving at approximately 45 mph, he observed a popping noise beneath him. The contact stopped the vehicle and observed smoke emanating from the front of the vehicle. The vehicle went into limp mode, lost power, and when the brake was depressed, the vehicle did not slow the vehicle down as intended. The contact stated that as he pulled into a parking lot to inspect the vehicle, he observed flames emanating from the hood. The contact stated that he pressed the hood latch, which did not open the hood, and he then exited the vehicle and observed the hood engulfed in flames. The contact mentioned that a store employee brought a fire extinguisher out and attempted to extinguish the flames. The fire department was called and extinguished the fire fully. There was no police report, but the police did come out to assist. The contact sustained a right-hand injury, but medical attention was not needed. The vehicle was then towed to the residence. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 124,000.

My 2023 GMC Sierra has 60,571 miles for a while now while driving the transmission slips and slams into gears. Recently driving with my kids in the car on highway going 70mph the back brakes locked up multiple times, so scary and dangerous while driving. I now currently have a code P-0747 in the system.

The contact owns a 2020 GMC Acadia. The contact stated that the AC was inoperable. The message “Driving Assist Reduced - Drive with Care” was displayed. The vehicle was taken to the local dealer, where it was diagnosed, and determined that the battery needed to be replaced. The vehicle was not repaired. The vehicle was taken to an independent mechanic who replaced the battery. While driving, the message "Driving Assist Reduced" was displayed. The contact was concerned about driving the vehicle due to the failure of the steering wheel. The contact stated that the failure was related to GM Special Coverage: N252508350. There were four attempts to contact the manufacturer, but there was no response. The failure mileage was approximately 47,000.

The contact owns a 2017 GMC Acadia. The contact stated that while parked at her work, she had attempted to start the vehicle and was unable. The contact had the vehicle towed to an independent mechanic who diagnosed the vehicle and determined that the fuel pump needed to be replaced. The vehicle was repaired, but the failure reoccurred. The contact had smelled the strong odor of gasoline from the front end of the vehicle. The contact stated a co-worker had looked underneath the vehicle and confirmed the leak of gasoline. The contact had taken the vehicle back to the same independent mechanic, who advised that the fuel pump had failed and needed to be replaced. The vehicle was repaired. Additionally, the contact stated that she was in a parking lot at a shopping center as she was looking for a parking spot, the driver's side air bag exploded, there was no crash. The contact said that she heard a loud "boom," and she had scrapes on her arms, hands, and face. The contact stated that her sons both had cuts and scrapes on their faces, the contact said one of her children needed stitches on his lip from the explosion. The contact stated that the police and emergency services were at the scene. The contact stated that her vehicle was towed back to her residence. The contact stated that she and her children were transported by ambulance to the emergency room. The contact stated that the police issued a report, but she was not given the report number. The manufacturer was not informed of the failure. The failure mileage was approximately 150,000.

Engine failure on March 8, 2026. 2024 Sierra Denali 1500 VIN [XXX] Prior to this incident, the vehicle was taken to the same dealer due to the safety recall. The engine was inspected on November 12, 2025, and I was told that it "passed," with the remedy being a change in oil viscosity. I was driving on March 8, 2026, when I heard some odd noises (clanking and knocking). Shortly thereafter, the engine just stopped in the middle of the road. It would not restart, and as a result, I couldn't put it in neutral to roll it out of the roadway. It remained stuck in park. I was stuck for 2+ hours in the rain, waiting for a flatbed wrecker. Cars were unable to pass in either direction. When the tow truck arrived, I was told it had to be dragged on to the flatbed with sleds due to the transmission being stuck in park. The truck was taken to Carl Black GMC in Roswell, GA. On Monday they confirmed that the engine had seized and needed to be replaced. The repair was completed, and I picked up the vehicle on Friday, March 13. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

My car was t-boned on the driver side and no airbags deployed. The outer door and window exploded with the force. We were also hit from behind

The contact owns a 2017 GMC Acadia. The contact stated that while driving at an undisclosed speed and attempting to accelerate, the vehicle briefly lost motive power before slamming into gear. Additionally, the vehicle vibrated abnormally while changing gear. No warning light was illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 140,000.

I was driving in a city at 30 miles per hour no acceleration and no load. I lost oil pressure, dumped all the oil out of the crankcase and then the engine locked up. I had it towed to my mechanic shop that i have work done. The technician diagnosed it as a failed oil cooler pressure supply line. Where the solid steel line crimps to a rubber oil hose, that connection had not been applied enough pressure and the rubber line became separated from the steel line.

1.The driver side mirror tilts up or down every time the vehicle is started requiring readjustment before driving. My wife was almost hit by oncoming traffic when she did not remember to readjust the mirror before merging with traffic. 2. The driver seat bolster inflates every time the vehicle is started. The vehicle cannot be driven without deflating the bolster. These have been reported to the dealer 3 months ago with no resolution from them or GMC.