Over 1.1 million GM vehicles, including EVs, are under NHTSA investigation

Federal safety regulators have expanded an investigation into brake problems in more than 1.1 million General Motors vehicles, including several electric models. The National Highway Traffic Safety Administration first opened a review in April 2026 after Cadillac Lyriq drivers reported a "Brake System Failure" warning and loss of brake assist. GM had said the cause was a fracture in a part of its eBoost braking system, and that backup safety functions like anti-lock brakes and stability control would still work until the car came to a stop. But regulators say they kept getting reports of brakes failing immediately, not just after stopping, so they've moved the case to a deeper "engineering analysis" and widened it to cover all GM vehicles with the eBoost system.

The vehicles involved span several years and brands: the 2023-2026 Cadillac Lyriq, Chevrolet Colorado, and GMC Canyon; the 2024-2026 Buick Enclave and Envision, Chevrolet Blazer EV, Equinox EV, and Traverse, Cruise Origin, and GMC Acadia; and the 2025-2026 Cadillac Celestiq and Optiq. The same GM-made braking system also shows up in the 2024-2026 Acura ZDX and Honda Prologue, so those are included too.

Regulators have logged 745 incidents connected to the issue, including 22 crashes or fires and five injuries. If you own or are considering one of these GM, Honda, or Acura models, this is a safety investigation to keep an eye on, since it could lead to a recall if the analysis confirms a defect.