GMC Complaints

One evening while driving home from work, the transmission warning light illuminated on my dashboard, indicating that the vehicle would soon stop. The notification specifically stated there was a transmission problem. The following morning, I brought my truck to GMC for service. After running a diagnostic, GMC confirmed an issue with the transmission. A few days later, GMC informed me that they were waiting for a replacement part to arrive. The part did not arrive for almost a month. During this waiting period, I was forced to pay for a rental car. Since my truck was still under warranty, GMC should have covered the cost of the rental car for the weeks my vehicle was awaiting repair.

Vehicle lost all power and shutdown coming off the highway. This all happened even after the heavier ow-40 oil was added from the initial engine inspection. Been waiting almost 2 months for a total engine replacement

The ignition key gets stuck in the ignition after shutting off the car. The key may not be removed from the ignition. The failure of the transmission shift control mechanism directly impacts the safe, mechanical operation of the vehicle's powertrain and transmission park-lock functions. The vehicle was taken to a local GM dealer and the problem was recreated. This is a known problem with the transmission shift control assembly for several model years (2020 - 2023). Also, there was a previous class action lawsuit (Jefferson & Riley class action settlement) which specifically covered a predefined list of early-generation model years (including the 2017–2019 GMC Acadia, 2019 Chevy Blazer, and 2016–2019 Malibu/Traverse/Volt). GM continued using similar microswitch shifters in newer vehicles like your my 2022 Canyon. I had no prior warning lamps but the symptoms occurred infrequently after I purchased the vehicle on March 29, 2023. I am the original owner of the vehicle and in July 2026 the problem became frequent - on an almost daily basis. I took the vehicle to my local GM dealer and I was initially told to use my spare key and see if that fixes it. In August 2026, I took it back to the GM dealer and insisted that a diagnostic be done, at which time they agreed that the transmission shift control assembly was faulty. My concern is that GM continued to use the same defective part in newer GM vehicles even though this part was previously determined to be defective in the Jefferson & Riley class action settlement.

The paint on top of these kind of vehicles is peeling off tremendously, I've seen several vehicles like the same model& make in my neighborhood that have the same issues like mine with the paint coming off from the top of the vehicle. It's so badd to where it's corroding from the paint coming off!!!

I am writing to report my 2021 GMC Yukon Denali. This vehicle recently suffered a catastrophic failure of its 6.2L V8 engine while traveling on the freeway with my family inside, creating a severe and terrifying safety hazard. This failure occurred after my vehicle was supposedly remedied under GM’s official safety recall for the known L87 engine defect (Recall N252494001). As the National Highway Traffic Safety Administration's (NHTSA) recently escalated Engineering Analysis reflects, the recall inspection and 0W-40 oil remedy are failing to prevent these engines from destroying themselves. My experience is direct evidence of this continued safety defect. GM has since now fully replaced my engine however only reimbursed me 30% of what it cost to tow to their dealership. Thank you for your consideration.

While traveling northbound on the I 10 freeway my vehicle wouldn’t accelerate once pulled over to the shoulder the vehicle completely lost all acceleration and shut off. The vehicle smelled like burning plastic and would not restart. The dealership’s reporting engine fail.

While driving my son to school we were driving 45 mph and the entire engine shut off and lost all power. Engine would not restart. Took it to the dealer and was told the engine was dead.

On the freeway in the middle of nowhere Denali jerked, went into neutral, and stopped completely. Needed to get towed and it was complete engine failure. Dealership needed to completely replace engine and radiator

We were driving back from vacation in a 2022 Yukon Denali with less than 40,000 miles on it when our engine completely seized. We were going highway speeds in a remote area. 4 kids were in our car, one of them only 1 month old. We were stranded for 10 hours. Engine needs to be completely replaced. GM is not providing any assistance.

I am filing this complaint regarding repeated catastrophic engine failures in my 2021 GMC Yukon Denali equipped with the 6.2L L87 V8. I purchased this vehicle as a GM Certified Pre-Owned vehicle. At approximately 7,000 miles, the engine developed a knocking noise and was determined to require complete replacement. I brought the vehicle to the dealership on May 19, 2025, and it remained there until September 17, 2025—nearly four months—while the replacement engine was obtained and installed. Since receiving the replacement engine, I have driven approximately 6,000 miles. On August 4, 2026, I was informed by the dealership that the replacement engine has also failed and requires another complete engine replacement. This means my vehicle has now experienced two major engine failures at extremely low mileage, including failure of the replacement engine. I understand that the 6.2L L87 engine has been subject to a GM recall involving potential engine failure and loss of propulsion. I have now learned that NHTSA has escalated its investigation into continued failures involving these engines, including failures occurring after the recall remedy. My experience appears directly relevant to that investigation. I regularly transport my children in this vehicle and am extremely concerned about the possibility of an engine failure occurring while traveling at highway speeds or with my family in the vehicle. I feel fortunate that the previous failures did not occur under those circumstances. I have contacted GM and requested that they repurchase or replace my vehicle. GM denied my request and has refused to provide me with a reason for the denial. I am asking NHTSA to document my complaint and investigate whether the existing recall remedy is adequately addressing the underlying safety defect, particularly given that my replacement engine failed after only approximately 6,000 miles.I can provide repair orders, recall documentation, mileage records, and correspondence with GMC