NHTSA Probes GM Brake-by-Wire System Covering Over 1.1 Million Vehicles

The U.S. National Highway Traffic Safety Administration has escalated its investigation into General Motors' eBoost electro-hydraulic brake system to Engineering Analysis EA26006, covering over 1.16 million vehicles across 14 model lines from GM, Honda, and Acura for model years 2023–2026. Investigators have logged 745 incident reports, 22 crashes or fires, and six injuries, with no fatalities and no recall issued so far. GM has told investigators that a fractured spindle inside the brake control module triggers a controlled degradation sequence, allowing the vehicle to stop safely before limiting speed to around 43 mph. However, a subset of driver reports received by NHTSA describe an immediate loss of brake assist during active braking — not after the vehicle has stopped — which contradicts GM's documented and tested failure sequence. This gap between GM's designed fail-safe behavior and real-world incident reports is now a central focus of the federal investigation.