GMC Complaints

in september the check engine light came on and the care began making aloud knocking noise. When we brought it to our mechanic he let us know that the engine had bad connection rods and I would need a new engine. The mechanic stated he has seen this multiple times on GM V8 Motors

My vehicle stalled while driving on a busy highway & I had no option but to pull over, which left me & my family in a very dangerous position. Had to remove my daughter's wheelchair onto a tow truck as the vehicle had no power to use the hoist for her powerchair. Again, on the side of a busy road! Towed the vehicle to a GM dealership, who stated there was catastrophic engine failure & the engine had to be replaced. Had no way to transport my daughter until I got a new engine since her hoist was stuck at the dealership. This was our original vehicle, until the sold me another one with the same defect (2024 Yukon for MORE money!). That vehicle was reported in Complaint 11657786.

The contact owns a 2024 GMC Sierra 3500. The contact stated that while driving at 30 MPH, there was a loud pop and the vehicle jolted, after which the vehicle started to lose motive power. The contact was able to pull over to the shoulder of the roadway, where the failure persisted. The check engine warning light was illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the transmission valve body. The vehicle was not repaired due to a lack of parts availability. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 63,000.

My vehicle stalled while driving on a busy highway & I had no option but to pull over, which left me & my family in a very dangerous position. Had to remove my daughter's wheelchair onto a tow truck as the vehicle had no power to use the hoist for her powerchair. Again, on the side of a busy road! Towed the vehicle to a GM dealership, who stated there was catastrophic engine failure & the engine had to be replaced. Had no way to transport my daughter until I got a new engine since her hoist was stuck at the dealership.

Engine failed while driving on interstate. Vehicle could not be put in neutral because engine has to be running to shift. Difficult to tow. 4 hours away from home. Took to nearest dealer. Hit by hail storm sitting on dealer lot with $8000 hail damage. Still making payments and have no vehicle to drive.

The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed and making a turn, the vehicle made a loud banging sound and the vehicle shut off. No warning light was illuminated. The vehicle was towed to an independent mechanic, who determined that the engine had failed and needed to be replaced. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The manufacturer was not made aware of the failure. The failure mileage was approximately 80,000.

The contact owns 2015 GMC Sierra 1500. The contact stated that while driving on several occasions at various speeds, the vehicle lost motive power. The contact stated that the check engine warning light was illuminated for approximately a month. The vehicle was taken to an independent mechanic and the contact was informed the high-pressure fuel pump was leaking fuel into the crank case, and the high-pressure fuel pump needed to be replaced. The vehicle was repaired; however, the failure reoccurred approximately 1 year and 5 months later. The vehicle was taken to an independent mechanic where it was diagnosed and determined that the high-pressure fuel pump needed to be replaced. The vehicle was repaired. The contact stated that on several occasions while driving at various speeds, there was a loud sound coming from the engine compartment. The vehicle was towed to an independent mechanic where it was diagnosed that the fuel injectors on one side of the engine were not working properly, and that the fuel injectors needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 178,137.

Having the same issue as the recent recall on the 6.2L v8 engine failures. This has been an ongoing issue from well before the 2021 and up manufacturing dates according to many online complaints. My vehicle now needs a motor due to complete failure.This came out of nowhere with no warning very recently. It is not drivable and a new motor is not in my budget when I still owe money on the truck. GM needs to step up for the rest of these failures.

I was driving down the highway on cruise control and all of the sudden i heard a squeal, banging noise with no power to accelerate so i pulled over to the side of the road and the engine said low oil pressure and shut down and would not restart. Multiple vehicles swerved to avoid hitting my vehicle creating a safety incident with possible injury and death. No symptoms prior to the failure and vehicle was maintained according to GMC specifications at the dealer with oil changes and tire rotations. Dealer has confirmed engine needs to be replaced but after several weeks they say they are unable to replace the engine because no parts are available and no estimated repair date. This is completely unacceptable and not a timely repair. I am without a truck and still paying for the loan of the truck with interest through GM financial.

Below 10,000 miles my truck had the master brake cylinder to put which they repaired under warranty. At about 89,000 miles the engine went out stating a misfire on cylinder 2. After talking with GM the vehicle needed all the rods and cam shaft replaced which was almost an $11k repair of which I had to pay almost $5k. The truck still has sporadic shakes while at idle. Many other owners have complained of the same issues. It’s hard to understand that a new truck would have so many issues. The truck was also sold without the chip to heat the seats or the heated steering wheel. These were down afterwards one of them about a year after purchase. We feel GMC should have paid for this repair given all their engine issues. They changed the warranty from 100k miles to 60k miles because they knew these engines have major issues.