GMC Complaints

Transmission will not shift out of 1st and 2nd gear. Backordered Valve Body Nationwide... none in the country. No ETA for this fix. Car has been in the shop over a month.

The contact owns a 2015 GMC Yukon XL. The contact stated that while his wife was driving approximately 35 MPH, there was an abnormal sound coming from the engine compartment before the vehicle stalled. The driver was able to steer the vehicle into a parking lot. The contact stated that his wife attempted to restart the vehicle; however, the vehicle failed to restart. The contact stated that his wife observed that the check engine warning light illuminated while attempting to restart the vehicle. The contact had the vehicle towed to a local dealer, where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired. The contact stated that prior to the engine failure, the vehicle had been towed to the same dealer for a failure to start. The contact stated that the starter motor and a 12-Volt battery were replaced. The vehicle was repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 127,000.

The engine went out while driving on the highway. Was driving around 60 mph. I almost gone to an accident. GM seemed like they knew of the problem but did not warn none of their customers of this problem. Car only had around 35,000 miles. GM however did swap out the engine. I want to sell and or trade it in, however the year and model lost its value due to the fact of the faulty engines.

I bought this vehicle at 80k miles and I have had an on going issue with the transmission. I have done research online and found that GM had put the wrong fluid in the transmission from the factory that has caused internal issues with the transmission leading to hard shifting and transmission shuttering. On my dime I have changed the fluid twice already and also the torque converter as well. This issue has gotten better but still a problem. This has caused me to not be able to trade my truck with out being upside down because of the dealers telling me they would have to put a new transmission to sell it. So now my trucks value has dropped as well. Now I am stuck in a truck that is not safe to drive. Thanks GM for not helping me.

Valve body failed while pulling my camper down the interstate. Transmission began to have issues and locked up on us while driving. Luckily i was able to avoid any accidents. Had truck towed to a private Transmission shop to have the transmission repaired. Shop advised the failure was due to the faulty valve body.

My Acadia has had a stuttering problem and we have taken it to the dealership many times. They finally changed the torque converter but that didn’t fix it. Now today (4/15/25) I got home and I was getting a steering assist reduced error code and then when I turned my car off the fan went as high as it could and wouldn’t turn off. Finally after a bit of time it turned off. I got my car 4/28/22

repeated mechanical failures of my 2022 GMC Sierra AT4, which I purchased on October 26, 2024, with approximately 37,000 miles on the odometer. The adaptive cruse control is wonderful when it works but I have found even with the sensor clean the truck will slam on brakes on its own causing me to nearly be rear ended. It happens when driving into the sun and at night. I no longer trust adaptive cruse and use manual cruse. Within just 55 days of ownership, and after driving roughly 4,700 miles, the vehicle experienced a catastrophic engine failure without warning on December 20, 2024. This failure left the truck immobilized in a highly dangerous situation—stuck in the middle of a 65-mph highway at a red light, without the ability to shift into neutral and remove the vehicle from traffic. I was forced to activate the emergency flashers and exit the vehicle, standing helplessly on the side of the road while praying that oncoming drivers would see the truck in time to avoid a potentially deadly accident. The truck was towed to the dealership the following day, December 21, 2024, where it remained for an unacceptable 110 days awaiting a replacement engine. I finally took possession of the repaired vehicle on April 10, 2025. Shockingly, only two days later—after driving just 328 miles—the vehicle suffered a second catastrophic engine failure without warning. The truck is now inoperable once again, sitting in my driveway and in need of a third engine replacement. While the odometer currently reads 42,365 miles. This ongoing situation has been not only a major inconvenience, but also a significant safety concern and financial burden. I am extremely disappointed in the reliability and performance of this vehicle. This level of failure on a vehicle that is still under powertrain warranty is simply unacceptable.

I heard a knocking noise in my engine on 4/13/25 and took it to a dealer to diagnose on 4/15/25. I had previously had to have the engine rebuilt due a collapsed lifter at 70,000 miles and I was concerned that the noise was a precursor to a repeat of that problem. Instead, the dealer informed me that problem was a failed connector rod bearing and would require a replacement engine. The service manager said my truck was not safe to drive since it could experience a sudden catastrophic failure on the highway. The truck has 80,000 miles and has been serviced at every single required interval by the original selling dealer. There was no check engine light warning.

Driving on the highway going 65 mph the engine started making a ticking noise and all of the sudden the car died and barely made it to the shoulder and after that the car wouldn’t start or nothing. Now the dealership had the car for a couple weeks already and still no update on when it’s getting fixed

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving 70 MPH, several unknown warning lights illuminated, with the message to shift to neutral displayed. The contact pulled over to the right side of the road and attempted to restart the vehicle; however, the vehicle failed to respond as needed. An unknown dealer was contacted. The contact stated that the failure had occurred on several occasions. The vehicle was towed to the dealer, where it was diagnosed that the engine was damaged and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and offered a monetary payment. The approximate failure mileage was 80,000.