GMC Complaints

4-5-25 Going 65 mph truck shut off for no reason. Dash message stated “press button to restart” I managed to pull over on side of road and place in park and restarted. Drove home and Chevy dealer service was closed. 4-7-25 Called in morning to get truck into service. 4-8-25 Service advisor called and stated No dash lights no codes . I explained that it was scary to have truck shutoff with no reason.i also stated that truck lurches and auto stop sounds wierd. Dealership Said tech was going to investigate further. I got a call next day 4-9-25 Service advisor said the main bearings bad and tech recreated problem and that motor was blown and need to order new from Michigan . Service advisor said he ordered engine and that it was known issue and covered under warranty. I asked how long he would have truck and he stated NO ETA. Truck engine seized during tech driving to reproduce my issue.

Vehicle was running but transmission was in PARK. Suddenly on screen in front of driver this message appeared: BRAKE SYSTEM FAILURE 43MPH TOP SPEED WARNING SERVICE ESC. Vehicle was not moving. Engine was running but vehicle was in PARK. I had to drive it home. Very difficult to stop. Brake pedal vibrated violently. Very long stopping distance even at 20MPH. I had the vehicle towed to the dealership from which I had purchased it. I bought this vehicle on 25 Nov 2024. Right now its mileage is 3757. Obviously my safety and that of others was put at risk. The service department at the dealership has not communicated with me at this time. There was NO prior warning nor were there any prior symptoms of this problem. It occurred VERY suddenly.

2024 the lifters when out in the engine and were replaced 2025 the engine malfunctioned while driving on the highway. There were messages that came up of low oil pressure and the engine completely locked up The dealership is saying the engine needs to be replaced

This vehicle had a complete engine failure. We lost power and could not start it. We were stranded on a busy highway. This all happened going 65 mph. The dealer told us that we would need a complete engine replacement. We had about 16,500 miles on it. I personally know two other people that this has happened too.

1) The engine began making unusual noises. I had the vehicle towed to the dealer. It is currently at Zimbrick Eastside in Madison Wisconsin. 2) The problem was noticed prior to my family being put at risk only because I noticed the noise happening while we were parked. 3) The problem has been confirmed. The dealer is doing a complete engine replacement. However, as of today, it has been at their location for over 30 days. 4) To my knowledge the vehicle has not been inspected by the manufacturer or any other 3rd party representatives. As of today, there has been no correspondence between myself and the manufacturer. 5) There were no warning lights, messages or symptoms prior to the problem. The problem first occurred on Saturday [XXX]. The vehicle has 19462 miles and we are the first owners. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On [XXX], my wife and our children were driving back home from Barstow when the vehicle stalled on the [XXX] freeway near Colton, CA. While driving at approximately 50–65 mph, we heard a clanking noise coming from the engine, followed by multiple warning and maintenance lights illuminating on the dash. The vehicle then lost all acceleration power and shut off, leaving my wife and children stranded in the middle lane of moving traffic. All of this happened in a matter of seconds. This situation quickly became a life-threatening incident. Vehicles, including large semi-trucks, were swerving and honking to avoid colliding with our stalled Yukon. Fearing for my family’s safety, I was forced to exit the vehicle in the middle of traffic and physically push the Yukon to the side of the freeway, while trying to keep my wife and children calm inside the vehicle. The panic and distress this caused my family—especially my wife, whose anxiety skyrocketed—is beyond unacceptable. Highway law enforcement arrived and remained there until we were able to get a safety tow off the freeway and out to a service shop with GMC. Just before that, we had received our vehicle back on February 20th, 2025 after being with the GMC dealership since January 3rd, 2025, for engine replacement. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2019 GMC Sierra 1500. The contact stated while driving 75 MPH, the vehicle occasionally downshifted or unintendedly came to a stop. There were no warning lights illuminated. The vehicle was taken to a dealer and the vehicle was diagnosed and the contact was informed that the transmission software needed to be updated. The vehicle was repaired; however, the failure persisted. The contact stated that on another occasion, the vehicle started to turn off unintendedly at traffic lights. The vehicle was taken to a different dealer and the vehicle was diagnosed and it was determined that the valve body software needed to be updated. The vehicle was repaired; however, the failure persisted. The contact stated that on another occasion, the vehicle started to vibrate violently while driving on the highway. The vehicle was taken to the original dealer and the dealer replaced the transmission; however, the failure persisted. The vehicle was taken to a different dealer and the vehicle was diagnosed with torque converter failure. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 48,000.

This truck, along with many others, has had wiring harness issues. My truck has fought this issue within the first six months of owning the truck. Since Jan 2025 it has left me stranded 3 times to be towed, and in the shop a total of 6 times for wiring harness issues. Rubbing that GM is 100% aware of how its designed. This has caused the truck to hesitate, shake, lunge, go in and out of gear severely hard then shut off while driving. All three time this happened to me recently i was on the interstate. GM has work orders out with all the codes and symptoms but wont do anything about it. Yes, i am out of warranty, but i am now paying over $5,000 for a new harness to be installed by a different dealer. The dealer that had always worked on this truck requested $8,100 so i called a new GM shop. This is a large issue and they keep turning their back and not addressing the issue and putting drivers at risk! Can provide last diagnostics and can request all notes from Stoops Buick GMC in Muncie Indiana, i have a rather large file there on this truck.

The contact owns a 2021 GMC Yukon XL. The contact stated that while driving at various speeds, the vehicle shuddered. The vehicle was taken to the dealer, where it was diagnosed that the lifters had failed and needed to be replaced. The manufacturer was contacted and informed the contact that only one side of the engine lifters replacement was covered. The vehicle was repaired accordingly. Additionally, the contact stated that while driving 55-60 MPH, the engine started shuddering. Several unknown warning lights were illuminated. The messages "Service ESC", "Forward Collision System Unavailable", "System Failure", and other unknown messages were displayed. The contact was able to drive to the residence. The vehicle was towed to the dealer, where it was diagnosed that the engine was blown and needed to be replaced. The vehicle was repaired at the contact's expense. The contact related the failure to NHTSA Action Number: PE25001 (Engine, Engine and Engine Cooling). The manufacturer was notified of the failure, but no further assistance was provided. The failure mileage was approximately 75,000.

It has nothing to do with the headlights. I was told by a couple different technicians that there's an issue with there being a slow oil leak with the GMC Terrains causing the motor/engine to lock up. I get my oil changed religiously! I even have files/reports showing so. It was NOT time for an oil change and my motor locked up. I still have 3 years to pay on my vehicle and it's my primary ride. So after having it towed 4 times...I have to get it towed 1 more time back to the shop to get a used motor/engine installed for $6700 (that's what they estimated me). On top of not having a vehicle for 3 months and making payments on top of it.