National Highway Traffic Safety Administration Expands Investigation into General Motors Engine Failures

The National Highway Traffic Safety Administration has expanded its investigation into manufacturing defects affecting General Motors' 6.2-liter V-8 engines. The federal agency announced that the probe now includes 2025 and 2026 model years, increasing the total number of potentially impacted vehicles in the United States to 997,743. These defects, attributed to supplier quality issues, can cause a loss of motive power due to engine failure. While General Motors previously issued a voluntary recall for 597,630 vehicles from 2021 to 2024, the new engineering analysis targets engines produced outside that original window. The investigation follows hundreds of consumer complaints alleging post-remedy engine failures after customers received either a higher oil viscosity change or a complete engine replacement. General Motors spokesman Bill Grotz stated that the company continues to cooperate with the federal agency's evaluation. The investigation covers popular models including the Chevrolet Silverado, Tahoe, and Suburban, as well as the GMC Sierra and Yukon, and the Cadillac Escalade.

Sources

• Detroit Free Press
  NHTSA expands GM engine recall probe to include more model years
• Car and Driver
  NHTSA Opens Investigation Into GM V-8s That Won’t Stop Imploding, Despite Receiving Recall Remedy
• WSJ
  GM Faces Safety Probe Over Engine-Failure Concerns in Nearly One Million Vehicles
• Road & Track
  NHTSA Expands Probe Into 997,000 GM V-8 Trucks and SUVs After Reported Post-Recall Engine Failures
• Reuters
  US highway agency expands probe into GM pickups, SUVs over engine failures