GM L87 6.2L V8 Engine Investigation EA26005 2026: Which Vehicles Are Affected and What It Means

© A. Krivonosov

997,743 vehicles and an unsettling question about a repair that was already completed: NHTSA has escalated its case on General Motors' 6.2-liter L87 V8 to an Engineering Analysis, EA26005. The investigation covers vehicles from the 2021–2026 model years. There is no new recall of nearly a million vehicles yet — 997,743 is simply the population NHTSA is now examining.

The sharper detail is this: NHTSA received 499 complaints of engine failure after owners already went through the earlier recall, 25V-274. In 473 of those cases, the vehicle passed the inspection and got a switch to a different oil viscosity; in another 26, the engine had been fully replaced before it failed again. On top of that, NHTSA logged 191 failures in L87 units built after the production window covered by the earlier campaign. GM, for its part, reported 6,953 complaints of post-repair failures to the regulator. The ODI files reviewed by SPEEDME note one crash with one injury; no fatalities.

The earlier U.S. recall covered 597,571 vehicles from the 2021–2024 model years with the L87, built between March 1, 2021, and May 31, 2024. That means the current review is about 400,172 vehicles wider, or roughly 67%. At the time, GM tied the problem to contamination in parts and oil galleries, along with deviations in crankshaft geometry and surface finish. Those defects can damage the bearings, destroy the engine, and cause a sudden loss of propulsion.

The family includes the Chevrolet Silverado 1500, Tahoe, and Suburban, GMC Sierra 1500, Yukon, and Yukon XL, and the Cadillac Escalade and Escalade ESV, all with the naturally aspirated 6.2-liter L87. It's telling that even as the current engine struggles, GM is already preparing a next-generation V8 for the Silverado and Sierra, this time at 6.6 liters.

NHTSA now has to determine whether the earlier repair procedure was adequate and whether the problem extends to engines outside the original production batch. So owners shouldn't confuse an investigation with a recall: being included in the EA26005 population doesn't by itself mean a specific vehicle needs repair.

EA26005 opened on August 20, 2026, prompted by NHTSA's RQ26001 inquiry into how well the 25V-274 remedy actually worked. The agency cites 690 ODI complaints along with the manufacturer's own data. This is an engineering analysis, not a recall: an official owner-notification timeline and repair procedure under EA26005 haven't been set yet — those would only follow if the investigation leads to a new recall.