complaints.title

Model: Sierra Denali Ultimate Engine: 6.2L V8 VIN: [XXX] Mileage at Most Recent Incident: Approximately 52,000 miles Safety Complaint Summary I am submitting this complaint to report a recurring loss…

After driving my vehicle for a short period of time I stopped to go shopping. When I returned to my vehicle I started it as usual and the check engine light illuminated. I began driving and within 0.…

While out of Town driving back home Wheel lock up on my 3500hd dually 2023 gmc .. vehicle had shudder effect and from 75 to 25 mph drasticly and engine reduced power light came on and wouldn’t come …

After completion of recall repair, changing oil weight from 0w20 to 0w40, I encountered loud squealing and knocking sounds from the engine bay. As catastrophic failure has been reported the vehicle wa…

I took the truck in for a recall they notified me and said it failed the test and there was metal in the oil and said it needed a new engine

OnStar module failed. Unable to fix and needs replaced. Thousands of other individuals having same issue. Car can shutdown without warning while driving. This issue must be addressed by GM.

Start engine light came on while driving. The truck did a dead stop in the middle of the road. Tried to restart but nothing. A tow truck was called and the truck was dropped off at the local GMC deale…

I was driving down the road at 55 mph on 4/12/2026 and had let off the gas for a 45 mph zone when I experienced a violent downshift of the transmission that squealed the tires momentarily and felt lik…

On April 1, 2026 at approximately 7pm the vehicle had a complete engine failure exiting an interstate. As I was slowing to exit the interstate the truck, without warning, lost power and locked up the…

The plastic piece above the front grill detached and flew off the truck. I’m not sure the name of the part.

Based on the critical recall and safety concerns for this known issue for the 6.2 L87 Engine failure I am highly concerned that it takes over 171 days to just get an appointment to look at this issue.…

Motor locked up on highway with heavy traffic trying to exit highway

Our truck had just passed 60,000 miles when the engine seized. The recall procedure was completed in January, and the engine passed the test at that time. We were also using the recommended 0W‑40 oi…

On 18 March 2026 I was driving at night at highway speed with my family (wife, [XXX] son, [XXX] daughter, and [XXX] son) when, without any warning, my 2023 GMC Sierra AT4 with 20,700 miles abruptly…

My 2023 GMC Sierra has 60,571 miles for a while now while driving the transmission slips and slams into gears. Recently driving with my kids in the car on highway going 70mph the back brakes locked up…

I was driving down the road and my top grille molding flew off

While driving under normal conditions, a front grille trim component detached from my vehicle without any impact or external cause. The piece became airborne and struck my windshield, creating an imme…

My vehicle is a GMC Sierra 1500 Duramax diesel. The vehicle experienced a failure of the DEF (Diesel Exhaust Fluid) system, which was diagnosed by the dealership as a failure of the DEF tank heater. T…

Motor seized while driving

Vehicle exhibited a sudden loss of power, dash screen stated a restart of the vehicle was needed. I was able to coast into a neighborhood upon attempting to restart the vehicle nothing would happen an…