My 2023 GMC Yukon AT4 with the 6.2L V8 has experienced multiple serious engine-related failures. The original engine previously was making a whining / knocking noise, then seized and required complete engine replacement under a GM recall/campaign involving 6.2L engine failures. The replacement engine later developed a lifter/valvetrain failure and required lifter replacement. The vehicle is now again exhibiting a pronounced rhythmic mechanical knocking/tapping noise, primarily during cold starts after sitting for an extended period. The noise occurs on most cold starts and has been documented in multiple videos. The vehicle is currently at a GMC dealership for inspection. I provided the dealer with several videos clearly demonstrating the noise. The dealer has stated that it has not yet been able to reproduce the condition and is attempting additional cold-start testing. The exact cause is currently UNKNOWN. No consistent warning lights or dashboard messages have appeared with the current knocking condition. My concern is that this vehicle has already experienced a catastrophic engine seizure, followed by internal valvetrain/lifter failure in the replacement engine, and is now again exhibiting abnormal mechanical engine noise. I am concerned this may indicate another developing internal engine failure that could potentially result in engine seizure or sudden loss of power while driving, including at highway speeds or in traffic. The vehicle and engine remain available for inspection, and multiple video recordings of the recurring cold-start knocking are available.
No injuries · No fire · No crash
The powertrain malfunctioned and it at the dealership for an engine replacement. The vehicle lost propulsion on a 2-lane road while passing another vehicle. It cut off completely and started to decelerate. There was no warning or indication that this would happen and was dangerous in that I was accelerating to pass another vehicle when the event occurred. I was able to safely pull into a driveway, but the vehicle would not crank as it could not detect what gear it should be in. It was towed to a GMC dealership locally who confirmed 2 days later that the engine would have to be replaced. It is under warranty and will take 3-4 weeks.
No injuries · No fire · No crash
Vehicle became disabled. GM service center determined that the crankshaft failed and lifter rods bent causing total engine failure. GM service center unable to determine cause and the engine is being replaced at a significant out of pocket cost.
No injuries · No fire · No crash
While driving down [XXX] in [XXX] engine had a major failure causing the loss of power and control of the vehicle going interstate speed. Luckily no accidents and no injuries or fatalities. All the these vehicles using the 6.2L engines made by GM should be bought back by GM at full purchase price. A few months ago my vehicle underwent the recall procedure and passed. So the recall process is incomplete and shows no real problem solving procedures, These vehicles are a ticking time bomb to all the owners and fellow motorists. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
No injuries · No fire · No crash
This car was subject to the GM Recall N2524940000 – This is related to engine failure in the vehicle. My Yukon Denali received the recall service on XXX at Liberty Buick GMC in XXX. It was determined that my engine would not fail and the car needed the heavier oil and a new oil filter. The car also received a 10 year warranty on the engine as part of the recall. XXX We were traveling down XXX Southbound on XXX headed to Atlanta to see family for Easter Break. My wife, son CJ (Age -XXX), XXX (XXX), and our English Cream Golden Retriever , Goose. We were traveling at 75 MPH on cruise control when a car came out in front of me. The car slowed down to adjust for the car moving out in front of us and then the engine completely shut-off and the car shifted into neutral. The car electronics turned off briefly, then came back on, with the dashboard saying “Push Start to turn on”. I hit the start button and nothing happens, I pushed the button several more times and still nothing happened. This occurred between 1:45 - 2:00 At this point, I begin to move into the right lane as we are approaching Exit XXX in [XXX]. I pull off on the exit, go about half way down and pull to the side, stopping the car. I place the car into Park and then push start on the car, nothing happens. I attempt to do this for about 5 Minutes and the engine still will not start and the car will not shut off completely (All electronics are still working). There were no warning signs that the vehicle would fail. The vehicle was inspected by GMC who determined that the engine had failed and would require full replacement. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
No injuries · No fire · No crash