General Motors Engine Failure Investigation Expands to Nearly 1 Million Vehicles

NHTSA Expands Investigation Into GM Engine Failures

The U.S. National Highway Traffic Safety Administration has upgraded and expanded its General Motors engine failure investigation involving nearly 1 million pickup trucks and SUVs. The agency said it is opening an engineering analysis, which represents a higher level of investigation than the formal review it began earlier this year. The latest action is intended to determine whether the automaker’s recall remedy effectively addressed engine failure concerns. The vehicles involved include Cadillac Escalade, Chevrolet Silverado 1500, Chevrolet Suburban, Chevrolet Tahoe, GMC Yukon, and GMC Sierra 1500 models equipped with L87 engines from the 2021 through 2026 model years.

2025 Recall Covered Nearly 600,000 Vehicles

General Motors recalled nearly 600,000 vehicles from the 2021 through 2024 model years in 2025 because of engine failure concerns that the company attributed to quality issues involving a supplier. In many reported cases, engines failed while the vehicles were moving, creating potential safety concerns for drivers and passengers. The recall remedy included inspecting engines and potentially replacing affected units, along with possible changes to the oil system. NHTSA’s latest engineering analysis will examine whether those corrective measures adequately addressed the underlying problem across the affected vehicle population.

Continued Complaints Raise Questions About Recall Effectiveness

The investigation has expanded after continued reports of engine failures involving vehicles that received the recall work. General Motors has received nearly 7,000 complaints alleging engine failures in vehicles where the recall remedy had already been completed, while NHTSA said it had received 499 complaints. The regulator also identified another 191 reports involving engine failures in vehicles equipped with the same L87 engine that were not included in the 2025 recall. The additional reports are significant because they could indicate that the original recall population or remedy may not have fully addressed the broader engine reliability issue.

Engineering Analysis Could Lead to Further Action

NHTSA said an engineering analysis is a required step before the agency could seek to compel an expanded recall or require additional repairs. The escalation therefore does not itself establish that a new recall will occur, but it allows regulators to conduct a more detailed assessment of the reported failures and the effectiveness of the existing remedy. The analysis could ultimately determine whether additional vehicles should be included, whether further repairs are necessary, or whether the existing corrective action is sufficient. The agency’s findings will be important for determining the next regulatory steps involving the affected L87-powered vehicles.

Earlier Investigations Preceded the 2025 Recall

The engine issue has been under scrutiny for several years. General Motors opened three internal investigations into the problem between 2022 and 2024 before issuing the 2025 recall after NHTSA began its own investigation. The automaker’s investigation last year identified just over 28,000 complaints, with about half alleging that the affected vehicles lost propulsion. In 2025, GM said it had identified 12 crashes and 12 injuries in the United States that could be related to the issue, along with 42 reports of fires that were possibly associated with the problem. The company said all reported injuries were minor.

GM Continues to Cooperate With NHTSA

General Motors said it continues to cooperate with NHTSA’s evaluation as the regulator moves the investigation into its engineering analysis phase. The company’s cooperation comes as regulators assess complaints involving both vehicles that received recall repairs and vehicles that were outside the original recall population. The investigation covers a broad range of high-volume pickup trucks and SUVs equipped with the L87 engine, making the outcome potentially significant for vehicle owners and future recall decisions. NHTSA’s findings will determine whether the existing repair strategy remains appropriate or whether additional regulatory action is warranted.

Frequently Asked Questions

What is the NHTSA investigation into General Motors engine failures?
The NHTSA investigation examines whether General Motors’ 2025 recall remedy adequately addressed engine failures affecting vehicles equipped with L87 engines. The agency has upgraded the review to an engineering analysis, a higher-level investigation that can precede additional regulatory action. The investigation covers nearly 1 million Cadillac, Chevrolet, and GMC vehicles from the 2021 through 2026 model years. NHTSA is evaluating continued complaints, including failures reported after recall repairs were completed, as well as reports involving vehicles that were not included in the original 2025 recall.