NHTSA Opens Huge Investigation Into General Motors V8 Engine Failures

The National Highway Traffic Safety Administration (NHTSA) has opened an investigation into reports of engine failures involving General Motors’ 6.2-liter L87 V8 engine.

The popular and powerful small-block V8 powers GM's full-size pickup and SUV offerings from all three of its key brands, Chevrolet, GMC, and Cadillac. The preliminary investigation affects an estimated 877,710 vehicles.

According to the NHTSA’s filing, the failures stem from a bearing failure that could cause either engine seizure—or the real party trick— a connecting rod breaching the engine block. This catastrophic failure would naturally result in the immediate loss of motive power, significantly increasing the risk of crashes.

NHTSA says it has already received 39 complaints related to the issue. Vehicle owners have reported sudden engine failures without prior warning signs, and in some cases, significant damage to the engine block.

Affected Vehicles

• Chevrolet Silverado 1500 (2019–2024)
• Chevrolet Suburban (2021–2024)
• Chevrolet Tahoe (2021–2024)
• GMC Sierra 1500 (2019–2024)
• GMC Yukon (2021–2024)
• Cadillac Escalade (2021–2024)

While most affected models were built between 2021 and 2024, the inclusion of older Silverado and Sierra 1500 models from 2019 and 2020 expands the scope of concern.

This investigation remains in its preliminary stages. The NHTSA’s Office of Defect Investigation is gathering data to determine the scope of the problem and whether a safety-related defect exists. If confirmed, a recall could be issued, compelling GM to address the issue across the affected fleet.

For now, drivers of these vehicles are not being advised to stop driving or to seek repairs unless they notice abnormal engine behavior. GM has stated that it will fully cooperate with the investigation.

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