GM 6.2L V8 Investigation: NHTSA Sets a November 13 Deadline for Engine-Failure Records on Nearly 1 Million Trucks and SUVs

Federal safety investigators have given General Motors until November 13, 2026, to answer most of a detailed request for engine-failure records in the 6.2-liter V8 investigation, according to a November 1 report on an October 25 deadline-extension memo. The extension applies to requests 2 through 6; request 1, covering vehicle-production information, remained due October 30. The National Highway Traffic Safety Administration September 15 information request seeks complaints, field reports, warranty and goodwill claims, lawsuits and incident records related to alleged engine seizure from internal component failure.

The investigation, engineering analysis EA26005, opened August 20 to examine the recall remedy and failures in later-production engines. It lists an estimated 997,743 model-year 2021-2026 vehicles equipped with the L87 6.2-liter V8, including the Chevrolet Silverado 1500, Tahoe and Suburban; GMC Sierra 1500, Yukon and Yukon XL; and Cadillac Escalade and Escalade ESV. The existing recall, 25V-274, covers 597,571 vehicles from model years 2021-2024, which GM attributed to manufacturing problems involving connecting rods and crankshafts that could damage the engine and lead to loss of propulsion.

The distinction in the August opening document is what owners should watch: NHTSA wrote that its Office of Defects Investigation continues to receive reports of engine failures after completion of the recall remedy. That does not by itself prove the remedy failed, and November 13 does not promise a new recall or a decision date — it is the date GM evidence is due so investigators can evaluate failures and the existing remedy. Owners can check their VIN through the NHTSA recall lookup and ask their dealer about any open recall in the meantime.