GMC Complaints

My 2021 Yukon Denali has roughly 70k miles and this is now the SECOND time that my engine shut off while driving >55mph on the interstate in the past 3 months. The first time, I had the sensation that the car was running out of gas when I went to accelerate. After about 5-10 seconds, the engine turned off, but the electronics stayed on. I coasted to the side of the road and tried multiple times to start it without success. The engine sounded fine while turning over and over, but it would never start. That episode turned out to be a bad fuel pump control module, and after roughly $400 at the local Firestone auto repair shop, I was on my way (FYI, they didn't diagnose it; I learned that was the likely problem by reading online forums and basically demanded they replace the FPCM). Now, here I am about 3 months later, and it happened again, just two days after I had the vehicle serviced at the GMC dealership for a check engine light that was intermittently coming on. The technicians said I needed an update to the Engine Control Module which was completed. The main difference was that this time, I had zero warning. There was no sensation of running out of fuel or funny noises from the engine. I just went to give it gas and noticed it wasn't working. There was a warning on the dash saying push button to start the vehicle (once again, the electronics stayed on when the engine shut off). After coasting to the side of the road, the battery seemed to be good, but the engine wouldn't turn over. I had it towed to the shop and am being told I will likely need a new engine!

Hi my 2023 GMC Yukon Denali Ultimate died in the middle of the road due to a catastrophic engine failure. That put my family and I in danger on the highway.

Was driving on highway when the engine started to labor. Without notice the car flipped into neutral. Obviously this was very dangerous going from acceleration to no engine power. I barely made it to the side of the highway by crossing two lanes to get there. When on the side of the road the car went into park and was unable to move to any other modes. Not even neutral. Again very lucky to have gotten off on the shoulder. Once the car came to a stop we were stuck for good. Had to get towed 60 miles or the nearest dealership with my wife and two young children. Took the car to a GMC dealership who said; “yeah this has been happening with the V8s”. It has now been 30 days and still no updates from GM outside of them waiting on a new engine. Also GM only gives you $44/day for a rental car which doesn’t even come close to covering a like kind vehicle. We had a 2024 Yukon Denali. I am now without a car and the only communication I am getting from GM and the GMC dealership is to wait until they receive and replace the engine, which they say should hopefully fix the problem. I am not taking the risk that this could happen again with my family in the car. Looking to get some form of a buyout and move into a different car.

My truck lost power while driving on the interstate.. had to restart while traffic moved around me.. truck eventually restarted and then again died while getting off exit ramp in traffic. Towed to Dealership and was diagnosed with a "blown" rod bearing. Full Engine replacement.

Yukon with 6.2 V8 suffered crankshaft bearing failure. Vehicle had only 9800 miles on it. No warning. Vehicle shifted itself into neutral and engine shut off. Engine replaced under warranty.

Engine has a bearing failure. Just purchased the truck it started to tick so I was being proactive stopped driving the the truck to prevent lock up.

L87 engine problems. I have had failed lifters, on top of transmission issues and a current oil consumption issue where I have to add two quarts of oil (sometimes more) without any indication of low oil. I took my vehicle into the local dealership and the technician asked if I had gotten any low oil indicator and I stated no. He proceeded to tell me it had little to no oil in it. Imagine this at highway speeds and sudden engine seizure.

While driving along [XXX] in northern Arkansas the on [XXX] my 2023 GMC Sierra Denali's 6.2 engine suddenly locked up causing us to pull on to the shoulder of the road - nearly causing an accident. The vehicle had 23000 miles on it at the time. We were towing a two horse trailer with one horse aboard. At our expense, we had the vehicle and trailer towed back to St. Louis, MO then to O'Fallon Buick GMC. The dealer replaced the entire engine under warranty with a used rebuilt engine. They have omitted the engine replacement from the vehicle history report in CARFAX. The dealer had handled a number of 6.2 engine failures prior to this one. The vehicle was serviced well within factory guidelines at the dealer. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Transmission Control Value issues. I was driving my car and RPM spiked up high and I coasted and there was no acceleration the rear wheel tires locked up and I felt a jerk. Placed the vehicle in park and pulled hand gear shifter into Drive and the vehicle shifted back into park by itself. Same thing happened on placing the vehicle in reverse. Like the car had a mindset of its own. Luckily I was only going 20 miles per hour this could have been a fatality. This vehicle is not on the recall list. It should be because they use all the same parts.

While I was driving, the dash screen read "Press start button" and suddenly the vehicle loss engine power and I had to veer to the far right lane. Luckily the cars around me swerved away. I had initially called OnStar, but when the police arrived they told me I couldn't wait for Onstar as I was impeding traffic so they called a local tow truck and they towed it to my house. From my house, OnStar towed it to the GMC dealership. The dealership stated the engine has locked up and needs a whole new engine replacement.