GMC Complaints

Electric trailer brake control modular is malfunctioning on my 2015 GMC Sierra Denali 3500. Multiple of sources told me this is a common problem with this generation of GMC.

The contact owns a 2014 GMC Acadia. The contact received notification of NHTSA Campaign Number: 23V334000 (Air Bags) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

The contact owns a 2014 GMC Terrain. The contact stated that after refueling the vehicle, the check engine warning light illuminated. The contact stated while driving at an undisclosed speed, the vehicle started shaking and vibrating and then stalled. The vehicle was examined by a local mechanic, who determined that the engine was damaged due to a lack of engine oil. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer and local dealer were not notified of the failure. The failure mileage was 147,623.

While towing a trailer in tow/haul mode on the highway traveling around 60mph, their was a strong downshift clunking sound. About 10 miles later, it happened again, except this time the brakes logged up and truck skid for about a full second and then trailer began fishtailing slightly. Check engine like P2C7A came on. Seems like brakes or transmission momentarily locked up.

The vacuum pump gears for the brake assist was shattered and metal parts were sent into the engine. I lost power brakes and was lucky to be able to stop the suv. The car was towed to a GMC dealer where it was diagnosed with a damaged exhaust cam, a shattered vacuum pump and metal pieces in the motor. Cost to fix $3200. This is a 2018 GMC Terrain with 112000 miles on it. I had a powertrane plus warrenty that was still valid but they refused to pay for anything. They claimed the vacuum pump caused the problem and it was not the engines fault. There were no warning check engine lights before this happened.

When making right turn steering got hard vehicle seem to loose power and stabilitrak light came on

Transmission had a hard shift which jolted the truck switching gears to a lower one unexpectedly. It caused my body to jerk back. It happened 3 times. 2 were mild but the 3rd time was extreme. Always while accelerating. Average speed was about 50 mph when this occurred. Dealer has confirmed a failure of the transmission valve body. If the transmission were to be put in park while traveling, it could cause major accident and injuries. After the 3rd time the engine warning light came on and the truck went into limp mode.

The vehicle, without any warning, suddenly stopped. I was unable to restart and unable to put the vehicle in Neutral for pushing to a safer location. Had to be towed to the dealership.

When vehicle is shifted to park, the “Shift to Park” warning illuminates and the vehicle is unable to shut off. Have to play around with the gear selector for several minutes in order to be able to be shut off. Looks like GM has known about it for a while and has done nothing. Has been occurring on ours for about a year now.

MY TRUCK HAS THE PRO TAILGATE AND THE INNER GATE HAS COME OPEN SEVERAL TIMES. IT HAS STOP OPENNING ON IT OWN NOW, BUT IT WILL NOT OPEN BY THE BUTTON ON THE TAIL GATE. IT SEEMS GM IS AWARE THEY HAVE A PROBLEM, BUT ONLY ISUED A RECALL ON CERTAIN TRUCKS AND NOT ALL TRUCKS WITH THE PRO TAILGATE,