GMC Yukon XL engine failure problems

Filed Nov 4, 2026 · Engine, Fuel system · MI

INCIDENT 1: Internal Engine Failure & Excessive Oil Consumption Component / System Failed: Engine Internal Components (Piston Rings, Valve Guide Seals, Spark Plugs) Failure Description: Excessive oil consumption (1.5 to 2.0 quarts burned every 2,000 miles) leading to heavy oil-fouling on spark plugs #5 and #7. Required complete cylinder head, oil pan, and piston teardown to replace all pistons, rings, connecting rod bearings, lifters, guides, valve guide seals, and spark plugs. Safety Risk: Severe internal engine oil consumption and plug fouling create an immediate risk of engine misfires, unexpected loss of power, or catastrophic engine failure while driving at highway speeds. Dealer / Repair Shop Confirmation: Confirmed by Dealership Service Department via oil consumption tests, spark plug inspection with oil dye, compression tests, cylinder leak-down tests, and physical teardown. Warning Symptoms: Low oil warning lamp illuminated; continuous need to top off oil between routine maintenance services. Inspection Availability: Vehicle and replaced components are available for inspection upon request.

Filed Nov 4, 2026 · Engine · NC

On October 10, 2026, at approximately 5,200 miles, our 2026 GMC Yukon Denali XL equipped with the 6.2-liter V8 developed a sudden, severe abnormal engine noise. The servicing dealership subsequently advised us that the engine had suffered a rod-bearing failure and required engine replacement. The service manager stated that the failed engine would be returned to General Motors and that the dealership could not determine the full extent of the internal damage. We have not received a confirmed explanation of the underlying cause. The vehicle has remained out of service since the incident. We were subsequently told that a replacement engine had shipped, but we have not received confirmation that repairs are complete. We are reporting this premature internal engine failure for the federal safety agency’s review as a potential safety defect.

Filed Nov 2, 2026 · Engine · MD

I own a 2021 GMC Yukon XL Denali equipped with the 6.2L L87 V8 engine (VIN: [XXX]). At approximately 149,000 miles, the engine developed a significant internal mechanical failure requiring complete replacement. The vehicle was diagnosed by Lexington Park Chevrolet Buick GMC, an authorized GM dealership in [XXX]. The technician identified a misfire in cylinder #5, significant oil contamination of the combustion chamber and spark plug, and broken oil-control rings on piston #5. The technician also documented bottom-end engine noise and determined that replacement of the engine assembly was necessary. The dealership replaced the engine with a GM remanufactured 6.2L L87 engine (part number 19420611), at an estimated cost of $10,950. Although my vehicle was not included in GM Safety Recall 25V‑274 (N252494000), I am concerned that this significant internal engine failure may be relevant to the federal safety agency's ongoing investigation of L87 engine failures, particularly those occurring in vehicles outside the original recall population. I request that the federal safety agency review and document this failure as part of its ongoing evaluation of the L87 engine and the scope of the existing recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 2, 2026 · Engine · 9,000 miles · TX

The contact owned a 2021 GMC Yukon XL. The contact stated that while driving 75 MPH, the vehicle suddenly shut off and lost power in the middle of traffic. The contact attempted to restart the vehicle, but the vehicle failed to restart. The contact stated that the emissions warning light and the drivetrain warning light were illuminated. The manufacturer was notified of the failure and offered to pay half of the cost of the engine repair. The vehicle was towed to a dealer, where it was diagnosed with lifter and rod failures. The contact stated that the manufacturer was aware of the 6.2L engine failures. The failure mileage was 9,000.

Filed Nov 1, 2026 · Engine · IN

Engine failure at approximately 72,000 miles. The vehicle had been inspected by GM dealer and passed the pico test at approximately 60,000 miles. GM suggested repair of 0w40 oil with new oil cap and driver's manual insert was completed.

Filed Oct 30, 2026 · Engine · CO

# Formal the federal safety agency Safety Complaint **2022 GMC Yukon — Catastrophic 6.2L Engine Failure, Sudden Loss of Power at Highway Speed, and Inadequate GM Response** I am filing this formal safety complaint regarding the catastrophic failure of the 6.2L V8 engine in my 2022 GMC Yukon, which has approximately 59,000 miles. The vehicle is associated with GM's 6.2L engine safety recall N252494000 (the federal safety agency 25V274). ### Sudden Engine Failure at 75 MPH — Serious Safety Risk While traveling approximately 75 miles per hour on the highway, our GMC Yukon experienced a sudden and complete engine shutdown **without any advance warning**. There were no indications that the engine was about to fail. The vehicle unexpectedly lost engine power while we were traveling at highway speed, creating an extremely dangerous situation for everyone in the vehicle and potentially for surrounding motorists. **Our family, including three young children with special needs, was placed at serious risk because of this sudden and unexpected engine failure.** The incident occurred approximately 70 miles west of [XXX], leaving us stranded in approximately 90-degree weather. We were also towing a trailer containing essential medical equipment required by one of our children with special needs. The sudden engine failure created an immediate highway safety hazard, followed by the additional concern of being stranded in extreme heat with medically vulnerable children and essential medical equipment that we could not transport with our disabled vehicle. ### GM's Failure to Assist With Medically Necessary Equipment Following the breakdown, we contacted General Motors for assistance. Despite explaining that our trailer contained medical equipment necessary for one of our children's care, GM would not assist us with moving the trailer. I find this response extremely concerning. Our family was already dealing with a frightening and potentially dangerous situation caused by the sudden failure. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

Filed Oct 22, 2026 · Electrical, Engine · CO

At around 7pm on Sunday October 18th I was driving on an interstate at about 80mph in the far left lane (of 3 Lanes) when, without any warning whatsoever, the engine power completely shutoff and the car went into neutral. The dash screen said to start the engine due to no power or low battery. I hit the start button and all the lights including all controls, blinkers, dash lights shut off. So with no blinkers, no lights, no power brakes, no power steering we were coasting in the fast lane of a usually unsafe stretch of an interstate at night. Luckily, I was able to navigate without any power to the right shoulder (lucky this was a stretch that had a shoulder) and coast to a stop. I had my wife and 4 kids in the car with me. The car was dead and said the engine battery was low. When the engine start button was pushed nothing happened, car was dead with no heat. We called onstar and requested a tow and were able to order a Lyft ride for my wife and 4 kids. The Lyft driver came to pick them up on the adjacent frontage road and they had to run across the grass median to get into that car, there was no other option to get them off of the unsafe shoulder. I stayed with the car with no power while cars and 18 wheelers speed by me while sitting on the shoulder without any lights or flashers. A highway patrol officer pulled up behind me and when he tried to open the passenger door he was unable to . I was LOCKED INSIDE THE CAR! Luckily the door unlock eventually worked and the door opened. The Patrol office stayed behind me on the shoulder of the interstate while we waited for a tow truck since it was such an unsafe situation. Due to the vehicle not being able to be put into neutral or any gear, it required a specific type of tow truck that was hard to find on a Sunday evening. It was towed to a dealer and diagnosis is catastrophic engine failure with full engine seize. Needs a full engine replacement. Assuming this is part of the massive recall on 6.2L V8 engines. SCARY!

Filed Oct 22, 2026 · Engine · AL

We own 2026 GMC Yukon XL Denali with 6.2L V8 engine with just under 4600 miles. On Monday October 19, 2026 while driving the engine seized up. It is at dealer and the are replacing the engine, radiator and about 65 other parts under hood. We do have a very short phone video of the noise it made right as it seized up!! We heard about investigation ongoing and wanted to help.

Filed Oct 21, 2026 · Engine · MT

My 2024 GMC Yukon XL Denali Ultimate (VIN 1GKS2KKLXRR331476, 6.2L L87) has been consuming engine oil excessively since early ownership. At the 20,219-mile oil change it was already a quart low, and it has needed repeated oil additions between changes since then. The vehicle is now at about 32,400 miles. I reported the problem in writing to the selling dealer on April 30, 2026, and again on October 9, 2026. GM opened case 115829578, but no oil consumption test or repair has been done. Low oil in this engine risks bearing damage and sudden engine failure while driving, the failure mode the federal safety agency is investigating under EA26005 for L87 engines built after Recall 25V‑274's production window, which includes this vehicle.

Filed Oct 20, 2026 · Engine · FL

vehicle keeps stall and loose power , I've been to the dealer many times and they replaced many parts (paid out of pocket)and the problem still , so after all of that and the struggle for months that i need to replace the engine . so i did replace the engine that cost me over 6k (out of pocket) and the problem is still , i went back and forth to the dealership and couldn't figure it out or reimburse me for anything.