2018 GMC Yukon XL: check engine light

Filed Oct 21, 2026 · Engine, Fuel system · OH

I was driving and the Engine light started blinking. the car started to lose power. i had to pull off the road. the blinking stopped and then i was able to get home. I had it towed to the dealership, where they told me this was a known issue with the AFM valve train system. this is a known issue and I was not made aware of it and continued to drive my car with my children inside of it. had i known, i could have had it assessed for the potential issue. But now, IT IS TOO LATE! I am now being told i need to pay $17,000 to replace my engine. something that could have been avoided if i had known to watch for any issue. but i was never warned. and now i have no car, still have car payment and no help from GM, GMC or anyone else. I know you cannot help me get this fixed, but maybe you can prevent this from happening to someone else.

Filed Feb 13, 2026 · Engine · 131,000 miles · MN

The contact owns a 2018 GMC Yukon XL. The contact stated that while driving at an undisclosed speed, and while the vehicle was idling, the engine was running rough. In addition, the vehicle failed to accelerate as intended while depressing the accelerator pedal. The check engine warning light illuminated and flashed on the instrument panel. While driving to the dealer, the vehicle hesitated, while driving and the vehicle drove roughly. The dealer diagnosed the vehicle and determined that the camshaft and lifters had failed and needed to be replaced. The vehicle was not repaired due to the cost. The vehicle remained with the dealer unrepaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 131,000.

Filed Oct 31, 2025 · Engine · NY

1. What component or system failed or malfunctioned, and is it available for inspection upon request? The engine (6.2L L87 V8) failed completely. The engine experienced knocking and rattling noises prior to the failure and then stopped functioning altogether while driving. The engine was replaced by Village Auto in Bellmore, and the failed engine is no longer available for inspection, as it was removed and replaced during the repair process. 2. How was your safety or the safety of others put at risk? The engine failure occurred while the vehicle was in motion, creating a dangerous situation where the vehicle suddenly started shaking and could not be driven. This posed a serious safety risk to me, my passengers, and other drivers on the road due to the loss of engine power, steering, and acceleration control in traffic conditions. 3. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. The issue was confirmed by an independent service center, Village Auto in Bellmore, which diagnosed the engine as irreparably damaged and requiring a full replacement. 4. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle was not inspected by General Motors, police, or insurance representatives. Insurance would not cover this issue and General Motors failed to take responsibility for a fault in the engine. 5. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No - all happened at once - engine light and complete failure

Filed Oct 22, 2025 · Engine · IL

Took the car to the dealer after getting alert from my GMC app saying it needed emission serviced, engine light came on, antilock brakes needing serviced. The dealership said that the engine is blown at just over 71200 miles. This car has only had service done at the dealership except for a tire change.

Filed May 28, 2025 · Engine · 60,000 miles · NY

The contact owns a 2018 GMC Yukon XL. The contact stated while driving 50 MPH, the check engine warning light was flashing. Additionally, there was an abnormally loud sound coming from underneath the hood, and the hood was shaking. The contact was able to drive to the residence. The vehicle was towed to Village Auto, where it was diagnosed and determined that the engine had failed and needed to be replaced. The vehicle was repaired. Village Auto contacted an unknown dealer. The contact later became aware of the federal safety agency Action Number: PE25001 (Engine, Engine and Engine Cooling), which the contact related to the failure. The manufacturer was notified of the failure and informed the contact that the repair could not be covered because the VIN was not included in a recall and due to the mileage on the vehicle. The failure mileage was approximately 60,000.

Filed Nov 27, 2024 · Transmission · 102,000 miles · VA

The contact owns a 2018 GMC Yukon XL. The contact stated that while her husband was driving 20 MPH in two wheel-drive(2WD), the vehicle started reversing while the transmission was in drive(D). The contact stated that after her husband switched to four-wheel-drive(4WD) and exceeded 40 MPH, the vehicle responded as needed. The vehicle was driven to the grandparent's residence, where it was parked. The check engine warning light was illuminated while the transmission was in park(P). The vehicle was then towed to an independent mechanic, who replaced the torque converter, the transmission, and several other unknown parts. No further information was available. The manufacturer was made aware of the failure and advised the contact to file a complaint with the federal safety agency Hotline. The failure mileage was approximately 102,000.

Filed Jan 17, 2023 · MO

1. Torque converter and currently at the GMC dealership right now. 2. failed to acceralate and runs backwards on hills if you brake at a light; stuttering between first and second gear. Hesitate to stop at lights, jerks very hard after delayed take off after braking at light. 3. Confirmed by the GMC dealership 4. Others, inspected by GMC dealership 5. None, no engine light or never seen on inspection equipment

Filed Jun 4, 2022 · Engine, Transmission · KS

The torque converter is too small for the vehicles transmission which then caused it to break and put metal into the transmission fluid. Which cause the transmission to break. My safety was at risk was because while on highway it shot high on RPMs and then made funny noise and wouldn’t go. The problem was confirmed at Aamco transmission where I have to get the transmission rebuilt. There was never a check engine light or check fluid or any codes Thrown before the problem.