The contact owns a 2021 GMC Yukon. The contact stated while stopped at a traffic signal, the engine started revving without the accelerator pedal being depressed. The contact stated that the vehicle occasionally independently accelerated. The contact state that the failure also occurred while the vehicle was in park(P). The contact stated no warning light was illuminated. The contact had not taken the vehicle to a local dealer or independent mechanic. The vehicle had not been diagnosed or repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 17,000.

- Timmonsville, SC, USA

The contact owns a 2021 GMC Yukon. The contact stated that while driving approximately 30 MPH and accelerating to approximately 40 MPH, another vehicle suddenly pulled in front causing the contact to apply the brakes. While attempting to apply the brakes, the brake pedal went to the floor. The traction control, ABS, ECF, and check engine warning lights were illuminated. The contact then pulled over to the side of the road where the vehicle eventually coasted to a stop. The contact drove the vehicle slowly to the residence. The contact had the vehicle towed to the dealer who diagnosed that the brake master cylinder and ECF needed to be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and opened a case. The approximate failure mileage was 24,000.

- Washington, MI, USA

Total Engine Failure. Cause UNKNOWN, Driving on highway from family vacation. For 1-2 miles prior to incident car begins running rough, High RPMs, Engine pressure rising. Receive a warning on dash. 'Engine shutting down. No prior warnings or issues in the vehicle life. Pull over' Engine will not restart. Have to call two tow drivers, neither are able to get engine into neutral to tow. Second tow driver uses makeshift skids to pull car onto tow truck. Is towed to nearest GMC dealer. At next business day the car is inspected and prognosis is total engine failure. This was a 2021 just over a year old with 22,000 miles. Vehicle shut down every person in vehicle could have been injured if we had been unable to pull over to a safe location, were driving 70mph on highway.

- Dallas, TX, USA

On a road trip out of state we stopped for gas. We got back on the road and few miles out the car suddenly slowed and gave a message on the screen something about acceleration. We pulled over and next the reverse didn-€™t work. We stayed overnight then next day the reverse still did not work. We were able to place in drive and continue on but we don-€™t have fully functioning reverse mode.

- Tokio, ND, USA

The contact owns a 2021 GMC Yukon. The contact stated that while the vehicle was idling in a drive-thru, the vehicle lost motive power and stalled. The contact stated that no warning lights were illuminated. The contact stated that he was able to restart the vehicle and drove the vehicle with no issues however, the next day the failure recurred. The vehicle was towed to the dealer where the failure was diagnosed as a power control module malfunction. The contact stated that the power control module was replaced under warranty. The contact stated that failure recurred several weeks later. The vehicle was towed back to the dealer where the failure was unable to be replicated. The vehicle was test-driven at the dealer for about 50 miles and no repairs were completed. The contact stated that the failure recurred for the third time and was awaiting a tow to the dealer. The contact related the failure to NHTSA Campaign Number: 21V739000 (Fuel System, Gasoline) however, the contact was unsure if the vehicle was included or had been previously repaired under the recall. The manufacturer was notified of the failure and a case was opened. The contact stated that he was awaiting a call back from the manufacturer. The approximate failure mileage was 5,400.

- Oak Lawn, IL, USA

We have a 2021 Yukon Denali. It has just over 12,000 miles on it. My wife called me In a frenzy today saying the motor was making a poping noise and it was pulling her on the interstate. She was very concered, but managed to make it home From Her 15 mile exit. When she got home, it was evident that the lifters are to blame For This incident. GMC needs to recall all these 2021 GMC Yukons with all these lifter problems. Very unsafe. We plan on getting rid of the vehicle.

- Lacassine, LA, USA

My blind spot warning light and signal doesnt work all the time. for example, if a pass a car, or a car passes me at a speed of more than 5 miles per hour, there is no notification from the blind spot warning light in the mirror, or an audalble signale either. i have taken the car to the GMC dealership 3 times and i was told that is normal, and nothing is wrong. I own other GMC models and i have never experianced this intermitant issue.

- Mentor, OH, USA

Engine failed on my new vehicle. GM is aware of faulty lifters produced over roughly a 3 month period. My vehicle has been confirmed to have those faulty batch lifters. At this time GM is only replacing lifters on the side of the engine that failed. The local dealership is having 2-3 of these come into the service shop per day. This is a major problem and I am being told it could be 2 months before I get my vehicle back. When I get the vehicle back I want it fixed properly and safe to drive. I don't want my family broken down on the side of the road due to GM knowingly not replacing a faulty product let alone the inconvenience of not having the vehicle again for repairs.

- Henrico, VA, USA

GMC Yukon Denali SUV 2021, push rods and lifters in motor are bad, this could have cause an accident due to SUV stopping in traffic or on the highway. Please help with this safety issue. The GMC Denali SUV 2021 only has 7000 miles on it, it new. I thank you in advance for you support. Regards George L Patterson

- Opp, AL, USA

We were coming back from a trip with my children and this vehicle was barely 2 weeks old with 0 miles and we were on a highway when all the emergency lights on the dash went off. It was flagging the electrical system, the engine, the brakes. Honestly all the lights possible went off. The vehicle was lagging and it felt force when we pushed on the gas. Our hands were gripping the steering wheel to keep it in lane till we could get off.

- Aurora, CO, USA