GMC Complaints

After 38,000 miles and 8 years of normal service (mix of city, highway, and 10% towing), my 8L90 transmission began to shudder occasionally. The problem first became apparent when driving slightly uphill, on cruise control at about 50 mph, or while slightly accelerating on a flat road, with no load in the box, and no trailer. It felt like I was driving across a rough patch of asphalt or rumble strips. Every half mile or so, it would shudder. Slowing down or speeding up stopped the rumble. The problem proved not to be caused by tires, U-joints, or AFM. The problem in fact was caused by defective GM transmission fluid, which was sold as "sealed for life", and rated for 200,000 miles, as factory-installed. That proved to be BS. If not repaired, this problem would lead to transmission lockup and/or lack of propulsion, which could contribute to a vehicle crash. The problem was solved by installing AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid, Product Code: ATLTP-CA. If GM properly cared for their customers, to make up for false advertising at the time of purchase, GM should publish and pay for GM Service Bulletin #20-NA-142, for all 8L90 owners, instructing owners to replace their transmission fluid every 5 years or 40,000 miles, whichever comes first.

I purchased a Yukon Denali 6.2L in March of 2022 brand new from Bob Johnsons in Rochester NY. On [XXX] at 12,577 miles the engine went through a catastrophic failure, while driving, the vehicle began to make very loud noises. The vehicle was taken to Bob Johnsons GMC 4389 West Ridge Road Rochester, NY 14626. The repair notes #3 main bearing thrust portion had come apart. The vehicle was out of service from 4/3/2023 to 4/19/2023 for engine replacement. On [XXX] at 50,244 miles on the vehicle, I was driving down a busy highway during holiday traffic and the vehicle went into neutral and would not start, we immediately turned the flashing lights on, unrolled the windows and began to show distress to ensure we were not hit by passing cars. We made it to safety and called Onstar for assistance, on this occurrence due to the vehicle not starting we were unable to get the vehicle back in to the neutral position to be able to roll the vehicle. The vehicle was towed to Bob Johnsons GMC due to the Thanksgiving holiday, the vehicle was brought in 11/28/2025, and deemed to need another engine replacement. On November 28th I called to file a claim with General Motors and was called back by Stephanie on November 29th and was told they would get back to me if they had any options as now this is the 3rd engine replacement. On December 3rd, a new woman called also named Stephanie and advised me they were still undergoing options, as I requested a Buy Back with Trade Assistance. On December 9th, my final call from General Motors advisor Stephanie, I was told I do not qualify for a buy back because I placed too many miles on the vehicle between engine failures. The vehicle was out of service from 11/26/26-12/29/26 for engine replacement. On [XXX] 2 weeks and 4 days after the vehicle going back into service, the engine failed again, only driving approximately 245 miles. I am currently waiting on the 4th engine replacement with no updates. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6

I habe a 2021 Yukon Denali and i have had engine failure on the road. Lifter issues and rod issues. i have paid out of pocket to fix it because my truck wasnt part of the recall. But i had the first failure in November 2024. Second failure January 2026.

4 months after bring my truck back to the dealership for a body valve issue on the 10 speed transmission. The truck went into limp mode while I was driving.

Vehicle 4WD performs poorly with car fishtailing at very low speeds 30 MPH in a straight lane. Very scary . Feels unsafe to drive . Brand new tires were installed prior to that. So not a tire issue.

My TAILGATE kept opening randomly and ENGINE WAS MAKING CLUNKING SOUND initially. Lost many tools on the highway once when it opened. Dealership told me my truck is not covered under a recall for both issues, even though other similar vehicles are. I refused to pay anything to have it fixed. They claimed my truck “wasn’t built in the factory that has recalls”. A month later the STARTER AND BATTERY burned up when I started up the truck, something locked up it sounded like. Eventually it started but didn’t sound right. A few days later the engine finally blew up. I paid out of pocket for everything for that trip. It’s currently back at the dealer being repaired with a new engine for the recall but GMC refuses to pay for the initial clunking/starter/battery and the tailgate issues. I’ve encored so many charges with tows and rentals from all these issues. I would like full reimbursement for everything.

Driving at approximately 30-35MPH merging in traffic, the transmission shuttered and went into reduced power mode. ECM reported a 747 code and valve body failure.

I have a 2013 GMC 1500 with the 6.2L Engine. There was a recall on my engine when I purchased it used with 21K on the odometer. I took it in for the 5K oil change at 26K miles and the "performed the recall oil change" replacing the oil with 0W40 oil saying this should "fix the recall". At 32K miles my engine blew up on Christmas Eve 12/24/2025 and left my son and I stranded on the side of the road. I had the truck towed to the GMC dealer and they are now in the process of replacing the entire engine. I have now been without my truck for over a month because several other owners with 6.2L engines are having the same issue.

Good morning. It’s about the safety recall for loss of propulsion due to manufacturing defects that can lead to engine damage and engine failure. GM notified me about this in September 2025 . So, I drove my vehicle to the dealership to inspect my vehicle , my SUV passed the examination, they replaced the oil recommending now another one with higher viscosity, new oil cap and an owner’s manual insert free of charge. Ladies and gentlemen; My concern from here on now is, just doing this is going to give me a peace of mind? Meaning the manufacturer defects issue is not longer in my vehicle? I paid a top dollar for this specific unit because I like to travel across the country even to go to Mexico. Right now I’m driving the truck silent, no music at all.driving the vehicle just to go to the store, to buy groceries,very short trips, around my neighborhood Trying to hear any noise, any knocking noise on my engine, observing the dashboard controls constantly, my family and I decided to stop traveling due to my vehicle is not secure to do it with this particular 6.2 engine because my notification letter from GM says that if the vehicle fails during operation will lose control increasing the risk of crash. As a GM customer, using my vehicle with my family I don’t feel safe and comfortable with my vehicle therefore I am asking and expecting for a better solution from General Motors. Not just replacing the oil for another one with a higher viscosity because doing this only is telling me that it’s just a cheap remedy, but the manufacturer defects are still there with my vehicle . I know they extended the warranty to cover this defect if something happens in the future, but isn’t about that , is about the safety, the concerns, the feelings of the family members involved in this insecure situation while driving this vehicle in the highway at 70 miles an hour.Ladies and gentlemen. I am pretty sure you can help us with this petition , GM should be able to do something way better.

Vehicle will not shut off, keep showing shift to Park, even when vehicle is in park with parking brake engaged. This has been a common occurrence and I see where people discuss a recall, but one is not available for my VIN.