GMC Complaints

1. Component / System Failed: The Supplemental Restraint System (SRS) / Driver’s Inboard Seat Airbag circuit has chronically failed, leaving the vehicle's primary safety restraint systems disabled. The faulty components and the physical service records documenting the failure are fully available for inspection upon request. 2. Safety Risk: The driver's safety and the safety of passengers are put at extreme, immediate risk. Whenever this failure occurs, the "Service Safety Restraint System" warning illuminates, which completely disables the airbag deployment system. Driving a heavy passenger vehicle (2021 GMC Yukon) without active driver-side airbag protection leaves the operator exposed to severe injury or fatality in the event of a collision. 3. Dealer Confirmation / Reproduction: The problem has been reproduced, diagnosed, and confirmed by an authorized dealership (Quirk GMC in Manchester, NH) on five separate occasions spanning from August 2025 to June 2026. 4. Inspections: The component has been repeatedly inspected by the manufacturer’s authorized dealer technicians at Quirk GMC. It has not yet been inspected by police or insurance representatives, as no crash has occurred. 5. Warning Lamps / Symptoms: The failure is preceded by the "Service Safety Restraint System" dashboard warning lamp and message illuminating. This symptom first appeared in August 2025 at 78,472 miles and has continuously reappeared shortly after every subsequent repair attempt made by the dealership, indicating a continuous, unresolved defect in the vehicle's safety manufacturing or a severe failure in the manufacturer's diagnostic repair procedures.

The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the reduced power mode and Check Engine warning lights illuminated. The vehicle was taken to the dealer, where it was diagnosed with coolant control valve failure. The contact was informed that the coolant control valve needed to be replaced. The vehicle was not repaired. The contact was informed that the failure was like the failure description in Special Coverage Bulletin: N252508341. The manufacturer was made aware of the failure but provided no assistance. The contact was informed that the VIN was not associated with the Special Coverage. The failure mileage was approximately 58,500.

I was driving at 45 mph and all of a sudden the screens went black as if the truck was turned off and the first thing I did was turn on the hazards because I didn’t know if the engine shut off either there was on coming traffic from both my front and back so I was scared my truck shut off 5-7 seconds later the screens turned back on and everything went back to normal but I was scared that my truck just turned off I made the dealership aware of this issue as soon as I pulled over and they said they had a busy schedule and that they would try to have a manager reach out to me to “squeeze me in” Mind you I just got my truck back from the dealership due to electrical issues and service yesterday and not even 24 hours later this happened so I am upset.

Engine Coolant Control Valve Position Sensor Minimum Stop Performance, and Chevy recalled this on this same motor and GMC needs to pays for this as it’s a major problem!

The contact owns a 2017 GMC Acadia. The contact stated that while driving at an undisclosed speed, the vehicle shuddered abnormally. No warning light was illuminated. The contact stated that the transmission and torque converter were previously replaced twice; however, the failure persisted. The vehicle was not diagnosed or repaired by an independent mechanic. The manufacturer was made aware of the failure and advised the contact to file a complaint with the NHTSA Hotline. The failure mileage was approximately 138,000.

Truck starting bottom end knocking noise at 57,700 miles. Engine had the recall done to it for Pico test and passed. Dealership states now it will need a new engine.

Issue is with the transmission as it harshly shifts into a low gear when on an incline. This causes me to lock up my breaks as it feels like the truck was rear ended by another vehicle. I’m concerned that this is going to cause an accident. This problem has not been reproduced by the dealer. I’ve taken it to the dealership several times. No warning lamps or messages.

I was driving on interstate 95 at approximately 70 to 75 mph when I lost all power and compromise steering with tractor trailer behind me God willing I was able to pull over to the shoulder. My safety was compromised and I lost all faith in Gmc. My vehicle has been out of service for 27 days at this point while waiting for an engine replacement with no ETA on service. According to Pennsylvania lemon law after 30 days a lemon law claim can be submitted

The contact owns a 2014 GMC Acadia. The contact stated that while in park(P), the vehicle rolled, requiring the driver to turn off and restart the vehicle, and the vehicle successfully shifted in park(P). Additionally, the contact stated that while driving at various speeds, the vehicle jerked. The contact stated that while driving 60-65 MPH, the vehicle shut off, and the steering wheel and the wheels locked up. The contact was barely able to pull over to the side of the road, where the contact waited before restarting the vehicle. The contact stated that the Check Engine warning light was recently illuminated. The vehicle was towed to two independent mechanics, where several diagnostic trouble codes associated with the transmission and the transmission module and solenoid were retrieved. The contact was then referred to a transmission specialist, where the vehicle was towed and was being diagnosed. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 160,000.

The tailgate opens unexpectedly, it can be inspected but it is in for repairs on 6/15/26. There was luggage in the back and it could have fallen out on the freeway. The problem has not been repeated by the dealer, but it has occurred several times in the past. The vehicle had not been inspected by others. There was no warning that the tailgate opened. They start to occur randomly several months ago.