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General Motors is facing renewed scrutiny over its 6.2-liter L87 V8 engine after federal safety investigators uncovered hundreds of additional engine failure reports, including vehicles that had already received recall repairs. The investigation is now examining nearly one million GM trucks and SUVs, raising questions about whether the original remedy adequately addressed the underlying problem.
The latest development also puts the manufacturing cutoff date at the center of the investigation. Reports of failures involving engines produced after that date suggest the problem may extend beyond the vehicles covered by GM’s original recall.
What is the problem?
The original recall was issued in April 2025, and covered 597,630 vehicles with engines manufactured between March 1, 2021, and May 31, 2024. GM identified manufacturing problems involving the connecting rods and crankshaft, whereby contamination from machining debris could damage the connecting rod bearings, while crankshaft dimensions and surface finishes outside specification could contribute to premature wear and engine failure.
If internal engine components fail, the engine can seize or stop operating while the vehicle is being driven, which can cause a sudden loss of propulsion, potentially leaving drivers unable to maintain speed in traffic. The original recall remedy involved inspecting affected engines, and depending on the findings, dealers would either replace the engine or change the oil to a higher-viscosity grade, alongside fitting a new oil filter and oil-fill cap.
However, reports of further failures have prompted the National Highway Traffic Safety Administration (NHTSA) to open an engineering analysis. By August 2026, the agency had received 499 complaints alleging engine failures after recall repairs. Of these, 473 involved vehicles that had received the oil change remedy, while 26 had undergone engine replacement.
NHTSA also identified 191 reports involving engines manufactured after the original recall’s May 31, 2024 cutoff. GM separately told investigators it had received 6,953 complaints of post-remedy engine failures. The investigation is examining whether the original repairs were effective and whether the manufacturing improvements introduced after the cutoff resolved the problem.
What owners should know
The expanded investigation covers approximately 997,743 vehicles from the 2021-2026 model years equipped with the L87 V8 engine, including:
- Cadillac Escalade and Escalade ESV
- Chevrolet Silverado 1500
- Chevrolet Suburban
- Chevrolet Tahoe
- GMC Sierra 1500
- GMC Yukon and Yukon XL
The earlier campaign specifically covered certain 2021-2024 vehicles with engines manufactured within the identified production period. Owners should check their vehicle identification number (VIN) through the NHTSA recall database to establish whether an outstanding recall applies. Those who have already received the repair should retain dealership invoices showing whether the engine was replaced or the oil viscosity was changed.
NHTSA is also seeking further information from GM about the number of vehicles repaired using each remedy and the subsequent failure rates. The investigation does not yet establish that the original remedy was ineffective or that all engines produced after the cutoff contain the same defect.
If your GM vehicle has experienced engine failure
The growing number of reported failures has raised fresh concerns about the reliability of GM’s 6.2-liter V8 engines and the effectiveness of previous repairs. If your vehicle has suffered engine damage, lost power unexpectedly, or required further work after a recall repair, get in touch with The Lemon Firm team to discuss your experience and find out whether you may have grounds for a claim.