GMC Complaints

On 7/17/25 vehicle was taken to Star Buick/GMC in Easton PA for rear brakes and an oil change. This vehicle has 49,981 miles on it. I was told after the oil change the tech took the truck for a test drive. I was told he made it about 20 feet and the engine seized. Either the tech forgot to refill the crank case or it is another GM 6.2 disaster. Please advise as the dealer is quoting over 12K to replace engine.

I was driving my 2022 GMC 2500 HD (not towing, just normal drive) after an oil change <900 miles ago and new brakes/rotors 3 days prior <100 miles (total mileage 81,000, serviced exclusively at GMC dealership) when the loss of power alert flashed on the screen. I was 2 miles from my destination, going approx 55mph, so I kept driving to destination, when the vehicle stalled in driveway. As I was scrolling through menus to see the alert I looked up and smoke and flames were coming out of the engine. I attempted to extinguish with a fire extinguisher I had with me, but it was no use. The entire engine was engulfed, melting out, tires and windshield exploded from heat etc. Total loss. Vehicle was inspected by insurance co fire investigator, no origin confirmed due to extent of damage. Vehicle was offered to GMC for their inspection as it was partially under OEM warranty and I had an extended warranty from dealership, which I also notified. Extended would not do anything without the vehicle at GMC and diagnosis, which again, there is no engine etc so not repairable. GMC was to be in contact with insurance co. No status update received.

I’m filing this complaint regarding my 2022 GMC Yukon Denali (VIN: [XXX] , MSRP ~$76,805) with an unresolved L87 engine recall. I made an appointment at my local GMC dealership on 5/8/25 specifically for the L87 recall. Upon arrival, staff only documented the Serial Data Gateway Module recall, which I hadn’t even known about. When I mentioned the 6.2L engine, I was asked if I was “sure.” I believe I was treated dismissively because I’m a woman. After pushing back, staff pulled up the bulletin, confirmed my engine needed replacement, and told me to “drive it until it blows up or there’s a fix, whichever comes first.” The L87 was only added to my receipt after I insisted—it was falsely listed as an “added operation,” though it was the reason I came in. I sent a certified letter to GM on 5/12/25 (signed for on 5/15/25) confirming the date I tendered the vehicle. Both GM and the dealer were fully aware the 60-day federal repair window had begun. It is now well past that deadline, and the L87 recall remains unresolved. Compounding the issue, the AC failed on [XXX], and the vehicle has been parked since early June due to extreme KY heat, making it unsafe to drive my children. I rely on this vehicle for daily commuting—driving ~100 miles/day for work—and it is also the only vehicle we own capable of towing our family boat, which has now sat unused all summer. I am currently paying $1,000/mo for the Yukon, $600/mo for the boat, and $200/mo for insurance—$1,800/month in preventable financial losses caused by GM’s failure to act. No repair has been offered. No loaner vehicle has been provided. No response has been received. I believe I was misled and discriminated against at the dealership, and I am now financially burdened and without a safe, reliable vehicle. This situation qualifies under the National Traffic and Motor Vehicle Safety Act for repurchase, compensation, or forced resolution. I am requesting a formal investigation and full remedy. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

Acceleration failing. Knocking of motor, winding sound, a huge clicking sound when accelerating, and engine burning very excessively. We have 4 children and its very unsettling to say the least on a 100,000 vehicle we paid for. I hope and pray you include our vin number with the 6.2 recall as the dealer is well aware of this problem long before the current recall. It's very unfortunate that our vin wasn't part of this very serious safety issue. Thank you

The contact owns a 2016 GMC Sierra 1500. The contact stated while the vehicle was parked, the contact became aware that the radiator was leaking fluid. There was no warning light illuminated. A dealer was contacted. The vehicle was taken to a dealer where it was diagnosed and determined that the radiator needed to be replaced. The vehicle was repaired. The manufacturer was not notified of the failure. The contact was referred to the NHTSA Hotline for assistance. The failure mileage was 98,000.

the coolant control valve failed, and now its been in the dealership for over a month. I have been reading online that this is not an isolated issue, and many people experience months of wait time getting the part because its apparently nationally backordered because of this problem.

I noticed when I put my car in park and turn key off, it’ll ding to warn me to “shift into park” this been becoming a problem recently and it’s been happening more often.

there seems to be electrical issue. the fan won't stop running even when shut off. the thermostat stop working with pretty low milage along with the tire sensors. Fixed the previous issues. Furthermore, while driving the vehicle stop working and had to use the momentum to park on the side of the road causing a unexpected break down. The vehicle won't start. This again seems electrical and the dealership want to charge for this. The vehicle is damaged since the manufacture and huge safety issue. Please urge to get a recall for all this items since it seems immersive expensive and unsafe to have to repair all this issues.

The contact owns a 2024 Chevrolet Sierra 2500. The contact stated that while his son was driving 60-62 MPH in tenth gear, the transmission unexpectedly downshifted to seventh gear. There was an abnormally loud clunking sound coming from the vehicle. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the valve body needed to be replaced. The vehicle was not repaired due to the parts being on backorder. The manufacturer was contacted, but no additional assistance was provided. The failure mileage was approximately 68,000.

wn a 2021 GMC Sierra 1500 6.2L (VIN: [XXX] ), which is now experiencing a severe misfire, engine ticking, and diagnostic code P318A. I’ve confirmed this issue is related to GM Recall N252494001 for engine connecting rod/crankshaft failure. However, I’ve been told my VIN has not yet been activated for recall repairs, and both the local dealership and GMC support have refused to escalate my case or offer assistance. This is a known safety issue, and I’m now at risk of total engine failure and significant financial loss while waiting for GM to act. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)