My vehicle is making a knocking sound and has the L87 6.2 V8 engine that is under recall for catastrophic failure. It has been evaluated by 2 mechanics that say it needs a new engine. Yes it is available for inspection upon request. Although it has not shutdown yet, both mechanics have said it is eventually going to be a catastrophic failure. My safety and families safety is at risk of it shuts down and causes an accident. There is no warning light currently displayed.
No injuries · No fire · No crash
Once we learned about the 6.2L Engine Failure we took the vehicle to Mckinney GMC in [XXX], test were run and were told the engine needed to be replaced, but would take several months to repair. We could not wait months for the vehicle so we had the vehicle towed to Sewell GMC in [XXX] (we bought the vehicle CPO from there) they ran test and said we didn't need a new engine but that they would just replace the oil weight and it would be fine. The engine has not run right since, it shakes and idles hard, and was never given a clear answer as to how metal shavings were found in the oil at McKinney GMC but magically disappeared at the Sewell dealership. Its very unsettling that at any moment while driving the engine could seize and blow. I feel like we have a lemon vehicle and the oil weight change is simply a band aid for this situation. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
No injuries · No fire · No crash
This vehicle has been towed into GMC service 3 times to date. #1. 2/2024 (mil 22,662) would not start, low voltage msg, replaced battery. #2. 4/2026 (mil 57,854) vehicle went into N on its own while I was driving down the road, msg on dash "function not available", I stopped and the engine died & would not restart, no engagement from starter motor, found P0615 present, found blown fuse on battery distribution fuse block, replaced. #3. 7/2026 (mil 63,041) vehicle went into N on its own while I was driving down interstate, msg on dash "function not available", I stopped, the engine died and would not restart, found main battery fuse blown, engine seized, found spun rod bearing full of metal debris, replaced engine, radiator, cooler lines, seals, gaskets, bolts, & fluids. My safety was at risk as I was driving down a highway and the interstate 2 of the times the vehicle put itself in N. The problem has been confirmed by the dealer. The vehicle has been inspected by the dealer's service dept. Prior to these incidents I did not notice any symptoms that would have alerted me of what was to come. **This report is referring to my latest incident which was engine seizure. *Two recalls have been performed, #1. 5/2025 "reprogrammed serial data module" & #2. 11/2025 "engine loss of propulsion recall", replaced oil with 0W-40 & "ECM software update recall", replaced ECM with SPS.
No injuries · No fire · No crash
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