GMC Complaints

The cam shaft bearing failed under normal driving conditions. Many of the service engine lights including brakes and primary service engine light came on after the cam shaft bearing failure. The engine was replaced by a GM dealership at 65,000 miles and was inspected to determine the cam shaft bearing failed. Luckily the engine failed at a speed of 35 mph on an off ramp, as a complete engine failure on the highway could have been much more dangerous. Following the replacement of the engine, within 500 engine miles, O2 sensors in the catalytic converter were replaced and ultimately the catalytic converter had to be replaced as well.

The vehicle experienced a sudden and rapid mechanical failure of the 6-speed automatic transmission (6L80 model) within a span of less than two weeks. The light did not come on until the transmission was past salvage. The failure escalated rapidly from initial minor slipping to a severe loss of vehicle propulsion. A loss of acceleration while driving poses an immediate crash hazard, as the vehicle cannot safely maintain speed with surrounding traffic or accelerate out of dangerous situations. The failure required towing and a complete out-of-pocket replacement of the transmission unit at 116,374 miles to restore safe operation. The manufacturer has failed to issue a safety recall despite widespread failures of this component causing unexpected power loss on public roadways.

The contact owns a 2019 GMC Sierra 1500. The contact stated while driving at 55 MPH, the vehicle made an abnormal rumbling sound and stalled. All the warning lights illuminated. The vehicle was taken to a nearby independent mechanic, who determined that the engine lifter and cylinder had failed. The vehicle was not repaired. The local dealer was not contacted. The manufacturer was contacted and confirmed that there was no recall coverage. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 98,003.

The contact owns a 2022 GMC Sierra 2500. The contact stated while driving at various speeds and pulling a 10,000 pounds trailer, the vehicle experienced an intermittent loss of trailer brakes. The message "Check Trailer Wiring" and another message pertaining to the trailer brake system were displayed. The vehicle was taken to the dealer, where the Trailer Brake Power Module (TBPM) was replaced; however, the failure persisted. The contact related the failure to GM Customer Satisfaction Program Number: N232414840 (Intermittent Loss of Trailer Brakes). The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance in adding the VIN to the Customer Satisfaction Program. The vehicle was not repaired. The failure mileage was approximately 110,000.

While driving the vehicle became extremely difficult to stop I was advised that the Vacuum booster pump was broken and it needed to be replaced. This was first completed 09/24/25 by Gateway tire and service center. I was advised that there was a service bulletin for the issue. Then I have had the same thing happen and I returned the vehicle to the same repair shop and I was advised that the Vacuum booster pump was broken and it caused the exhaust camshaft to break, as well as the timing was out. The shop had to replace several things in order to repair and I was responsible for the cost. There was no warning before either of the incidents.

Driving on highway at 80 MPH and accelerator stopped working and car turned off. We had to coast off toll rd and hope for the best. No warning and happened with our whole family in the car. I had a recall notice from manufacturer but last time I tried contacting manufacturer/dealer they said no resolution was available to repair recall yet and that I couldn’t drop off my vehicle.

The infotainment screen on my 2021 GMC Yukon was previously replaced at the GMC dealership, and this will be my second replacement. It has now cracked even though there was only very light contact. This doesn’t seem like normal wear and tear. I’d really appreciate it if the screen could be inspected, as I suspect there might be a manufacturing issue with these screens. I’m quite concerned about this problem because it almost caused injury to my six-year-old. Please understand my worries, I’m sure many other parents are facing similar concerns with these screens. The cracked glass can be dangerous, especially for families with children.

My gmc sierra had no warning lights, on the way to work on the highway it started making noises which increase every mile .Vehicle just turned 60.049miles . Engine completely seized up , low oil pressure light on , vehicle shuts off , luckily making to the shoulder and off the road. Gm towing wasn't any help in middle of the winter with 0° outside that morning , they told me that it's not covered under warranty and it would take 3 hrs for towing to get to me and out of my packet cost . Dealer diagnosed issue , found code P0016 (crankshaft position-intake camshaft position not plausible) also found excessive amounts of metal in the oil. Vehicle was repaired and second engine was installed .

This vehicle was bought new and is a NEW 2026 GMC TERRAIN DENALI with less than 5,000 miles at this time. It is a continuous event and not a specific failure date, but began soon after purchasing. The specific parts are UNKNOWN. It could be tires, wheels, steering parts (CV JOINTS, CONTROL ARMS ETC) or possibly transmission. I took it initially to the purchasing dealership and they took it for a ride and just dismissed the problem without investigating. Several days later I called and talked to the person who sold me the SUV and was told either him or service manager or both would call me, but neither did so. They were to set up a return date. After this insulting experience I decided to take it to a Cadillac dealer that I have had great experience with in the past. They took it for a ride and did experience the problem and investigated what they thought could be causing the SUV to wobble, shimmy, or shaking sensation. This Cadillac dealer said there investigation showed nothing wrong and returned the vehicle to me and said nothing could be done unless GM gave them permission. Next I wrote to the service manager expressing my disappointment in nothing being done and my disappointment in General Motors. There is a Service Bulletin (Document ID: PIT6466). This makes four efforts on my part to get satisfaction with this 2026 GMC TERRAIN DENALI and how it is not fun to drive and there is anxiety on the safety of the vehicle when being driven. *Now for the problem I am experiencing with this 2026 GMC TERRAIN DENALI. There is the sensation of a “wobble, shimmy, or shaking” under low to moderate acceleration when going straight or turning. It could be tires, wheels, steering parts or power train. It is difficult to tell. Sometimes the sensation is as if the wheels will fall off. This is an awful feeling and gives you the feeling the SUV is not safe and it is not fun to drive at all.* Why do I have to drive a brand new expensive SUV and feel unsafe and not enjoy do so?

Gear shifter is not registering that the vehicle is in park. Because of this issue I have to sit in the vehicle for up to 15 mins trying to get it to register that it is in fact in park and can turn off. If I didn't take the time to do this, it would kill my battery. Unfortunately with the heat index, the vehicle gets hot very quickly and im now worried about getting hot stroke trying to get it to register it is park. This is a known issue with the vehicle that has an active recall for other vin numbers with the same issue.