NHTSA Probes GM's 6.2L V8 Fix as Engine Failures Persist Post-Recall

General Motors’ recall remedy for its L87 6.2-liter V8 engine was supposed to put an end to a series of reliability complaints that have plagued certain trucks and SUVs. Instead, newly opened federal scrutiny suggests the fix may be failing in the field, with reported engine failures occurring after the recall service was completed. The National Highway Traffic Safety Administration has escalated its review to an Engineering Analysis, a stronger stage of investigation that could lead to additional recall actions. The move reflects growing concern that the original repair, which was intended to address issues like bearing wear and potential engine seizure, may not be preventing repeat failures in real-world driving. Affected owners have reported incidents of sudden power loss and, in some cases, complete engine failure even after receiving the mandated updates from dealers. While GM has not publicly altered its position on the remedy, the agency’s decision to deepen its probe suggests that the company may need to revisit its approach. The outcome could hinge on whether the fix addresses root causes or merely masks symptoms, a question that NHTSA engineers are now working to answer.