499 owners say their GM V8 failed again after the recall repair

General Motors’ 6.2-liter L87 V8 powers some of the best-selling full-size trucks and SUVs in America, and 499 owners have now told federal regulators that the engine failed again after GM’s recall repair. Of those, 473 had received the higher-viscosity oil remedy and 26 had been given a complete replacement engine. The figures sit in an Engineering Analysis that the National Highway Traffic Safety Administration opened on Aug. 20, 2026, covering 997,743 vehicles.

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A repair that does not hold is a different regulatory problem from a defect nobody has addressed yet, and the agency treats it that way.

From a recall to a second federal probe

The first act was GM’s own. In April 2025 the company filed Recall 25V-274 with NHTSA, covering 597,630 vehicles with the L87 built between March 1, 2021 and May 31, 2024. GM told the agency that teardown work found two supplier-related root causes: rod-bearing damage from sediment left on the connecting rods and in the crankshaft oil galleries, and crankshaft dimensions and surface finish outside specification. The company said that a failed engine means the vehicle will lose propulsion, raising the risk of a crash. Its own tally of field complaints at that point stood at 28,102, including 14,332 alleging loss of propulsion, plus 12 alleged crashes, 12 alleged injuries it called minor or non-physical, and 42 fire allegations.

The remedy was not the same for every engine. Dealers inspected each one; engines that passed received higher-viscosity oil, a new oil fill cap, a new filter and an owner’s manual insert, while engines that failed inspection were repaired or replaced using parts built after the suppliers’ suspect manufacturing window.

NHTSA’s Office of Defects Investigation had already moved. It opened a recall query, RQ26001, on Jan. 16, 2026, to test whether the oil-and-inspection remedy was working, and the agency’s data listing shows that query closed on Aug. 20, 2026, the same day it opened EA26005. An Engineering Analysis is the step that follows an initial inquiry when the agency wants deeper testing, so the upgrade is the agency’s own signal that the early evidence justified more work.

GM told NHTSA what owners should watch for before a failure: knocking or banging noises, the check engine light, and performance changes such as hesitation, abnormal shifting, reduced propulsion or a no-start condition. The company also said it would reimburse owners for earlier repairs under a plan on file with the agency, and gave its recall contact as General Motors in Warren, Michigan, at 586-596-1733. Those details matter now because a vehicle that passed the oil-viscosity remedy is no longer protected by the recall in the way owners were told it would be.

Two groups of failures, 499 and 191

The agency’s opening document, signed off by investigator Steve Perry, reviewer Sharon Yukevich and approver Tanya Topka, sets out two separate concerns. The first is the 499 complaints from vehicles that had already been through the Recall 25V-274 remedy. The second is 191 reports of L87 failures in engines built after the recall’s production period ended, which explains why the probe reaches model years through 2026 rather than stopping at the 2024 cutoff. The investigation also notes that GM itself reported 6,953 post-remedy engine failure complaints, a far larger pool than the 499 filed with the government.

The failure table in the document lists one crash or fire, one injury and no fatalities. The subject line NHTSA chose is blunt: loss of motive power caused by engine failure after a recall remedy.

Motor1 reported that GM has now faced several separate L87 inquiries since 2022, two of which closed without a recall and one of which, opened in January 2025, produced the recall. The outlet described the engine as proving to be a headache for the automaker, a characterization the agency’s own paperwork does not use.

What comes next is set by the agency’s process rather than by any deadline in the document. An Engineering Analysis lets investigators request more data from GM, test the remedy and the later-built engines, and then decide whether to ask the company to recall again. NHTSA has published no end date for EA26005, and its data listing shows the case as open.

Which trucks and SUVs are in the count

The 997,743 figure covers model years 2021 through 2026 and spans the Cadillac Escalade, Chevrolet Silverado 1500, Chevrolet Suburban, Chevrolet Tahoe, GMC Sierra and GMC Yukon, including the longer Yukon XL. Owners who want to know whether a specific vehicle carries the L87 and has an open repair can enter the VIN at NHTSA’s recall lookup, which shows campaign status for the original recall.

The document does not include a direct statement from GM, and the agency has not said what outcome it expects. The open question is whether NHTSA concludes that the remedy itself is inadequate, which could force a second recall, or that the later-built engines need their own campaign. The 499 owners and the 191 with newer engines are the evidence the Office of Defects Investigation will weigh first.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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