Full Breakdown
National Highway Traffic Safety Administration's (NHTSA) Expands Probe into Nearly One Million GM Trucks and SUVs Over Persistent L87 V8 Engine Failures
8/22/2026, 2:12:49 AM
Core Event: Expanded Engineering Analysis of L87 V8 Failures
The National Highway Traffic Safety Administration’s (NHTSA) Office of Defects Investigation opened an engineering-analysis investigation covering 997,743 General Motors (GM) pickup trucks and SUVs from model years 2021-2026 equipped with the 6.2-liter L87 V8. The action follows 499 complaints that vehicles repaired under the 2025 recall continued to experience engine failures, plus an additional 191 reports of failures in engines built after the recall’s production window.
Background & Context
In April 24, 2025, GM voluntarily recalled 597,630 U.S. vehicles (model years 2021-2024) after identifying manufacturing defects in the crankshaft and connecting-rod assembly of the L87 engine. The remedy required dealers to inspect each engine; vehicles that passed received a higher-viscosity oil, a new oil-fill cap, and an oil-filter replacement, while those that failed received a full engine replacement. Earlier investigations of the same engine occurred in 2022-2024, but the 2025 recall was the first to trigger a large-scale remedy.
Data & Statistics
- Potentially affected fleet: 997,743 GM vehicles (U.S.) from 2021-2026.
- Original recall scope: 597,630 U.S. vehicles (2021-2024) and roughly 721,000 globally.
- Post-remedy complaints logged by NHTSA: 499 (473 after oil-viscosity change, 26 after engine replacement).
- Post-remedy complaints reported by GM: 6,953.
- Additional failure reports for engines built after May 2024: 191.
- Historical field complaints (pre-recall): 28,102, with over half describing loss of motive power, 12 crashes, 12 minor injuries, and 42 fire reports.
Official Statements & Responses
NHTSA explained that the engineering analysis is a required step before any expanded recall can be ordered and will assess the effectiveness of the prior remedy.
Conflicting Reports & Gaps
- Complaint totals differ: NHTSA cites 499 post-remedy complaints, while GM reports 6,953.
- Scope of additional failures: The agency notes 191 failures in engines produced after the recall window (post-May 2024), a period not covered by the original recall.
- Remedy uptake: No publicly disclosed data on how many of the 997,743 vehicles have completed the special coverage program or received the higher-viscosity oil versus full engine replacement.
What’s Next
NHTSA will continue its engineering analysis and may recommend an expanded recall if the current fixes are found insufficient. GM’s special coverage program protects affected engines for 10 years from the vehicle’s original service date or 150,000 miles, whichever comes first.
Verbatim Quotes
- “They don't have a lot of outs until they get this corrected and corrected quickly, especially with the new motor coming out,” — Added Ivan Drury, director of insights at Edmunds
