GMC Complaints

As I was driving on the highway the check engine lights pops on and the engine starts stalling. The stability track light also came on and the truck was hard to maintain and drive. The truck has been maintained and serviced on a meticulous schedule. This is not the first major problem we have experienced with the truck, we had to do a full transmission replacement on the truck at an 118,000 miles mark. Me and my family have been the only drivers and owner of the vehicle and mostly on put highway miles. I am so frustrated and disappointed in the workmanship and quality of our vehicle.

Engine failure without any notice, loss of power, engine making extreme lifter noises

The contact owns a 2023 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, the “Service Transmission Now” warning light illuminated. Additionally, the contact stated that the warning light and a message indicated that the transmission would stop shifting soon. The vehicle was taken to the dealer; however, the vehicle was not inspected. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 31,230.

Recently, while driving my 2023 GMC Yukon Denali XL Ultimate (with only 19,457 miles) on the expressway, my vehicle suddenly lost all power and steering at high speed—without any warning lights, noises, or alerts. One moment everything was normal, the next I was gliding in silence, completely powerless in a 6,000 lb vehicle surrounded by fast-moving traffic. I was nearly sideswiped multiple times as I tried desperately to avoid a potentially deadly accident. This failure wasn’t just mechanical—it was terrifying. And it could have cost me my life. What happened next only made things worse. GM Roadside Assistance left me stranded on the side of the road for nearly 4 hours. Multiple tow trucks were sent, but none had the right equipment because the vehicle could not be put into neutral due to the engine failure. I was left vulnerable, frustrated, and utterly unsupported while GM fumbled through their response.

Vehicle has no reverse. 21,750 miles and have been told by the dealer that it needs a transmission valve body which are unavailable at this time and it could be several months before they are able to obtain the valve body.

My vehicle has a persistent shift to park issue. My vehicle cannot be safely turned off. My vehicle needs to be restarted multiple times and the gearshift moved to the park position for the chance that it will register being in the parked position so the vehicle can be safely turned off.

WHILE DRIVING ON HIGHWAY ON 2/21/25. MY 2023 YUKON (WITH GM ENGINE L87 IN IT) WARNING LIGHT CAME ON CALLING THAT THE TRUCK SHIFTED INTO NEUTRAL, PRESS START. PULLED OVER TO BREAK DOWN LANE, RESTARTED AND WENT ON OUR WAY. CALLED DEALERSHIP AND THEY HAVE NOT HEARD OF ANY TYPE OF ISSUE AND STATED TO BRING BY IF IT HAPPENS AGAIN. 8 DAYS LATER THE 2023 YUKON WITH GM ENGINE L87 SIEZED ON 3/1/25 WITH ~23,000 ON IT WHILE DRIVING ON THE HIGHWAY. VECHIE WAS TOWED TO GMC DEALERSHIP WHERE THE SUV WAS PURCHASED AND HAS BEEN SITTING EVER SINCE WHILE WE WAIT FOR A NEW ENGINE COME IN. DEALER HAS BEEN HELPFUL, BUT I HAVE READ THAT THERE IS A BIGGER ISSUE WTH THE L87 ENGINE.

While driving on a busy highway, the vehicle lost all acceleration. Seconds later, the entire truck shutdown. Lucky, I was able to get into the right hand lane prior to losing complete power, which allowed me to steer the truck onto the shoulder. It appears that an investigation has been launched into vehicles equipped with the GM 6.2L V8 L87 engine. This catastrophic engine failure not only put me in a fairly unsafe situation, it is costing me $13,800 to replace the engine on a 2022 GMC Sierra Denali.

Transmission has been failing for the life of this vehicle. Shuttered shifting and hard shifting are the norm. It is available for inspection. Vehicle does not shift properly when vehicle is in motion. Shifting is often delayed resulting in temporary loss of power. I have had the vehicle in to a transmission shop they have been able to reproduce the events. There are no warning lights visible to indicate an issue.

My engine quit in the middle of a intersection on 2-25-25 with approximately 20,777 miles and has been in shop waiting on a new engine ever sense and they can not tell me when the new engine will be in. I have call GM and get no time line on new engine.