The federal government is expanding a safety investigation into General Motors vehicles after receiving hundreds of reports of brake failure. The issue affects more than 1.1 million cars, including many of GM’s electric vehicles, as well as ones built for Honda and Acura. The problem lies with the brake-by-wire system, known as e Boost, which can suffer a spindle fracture while driving.

GM states that critical safety features like antilock brakes should remain operational until a complete stop. However, NHTSA’s ODI reports contradict this, alleging immediate loss of braking upon e Boost failure. There are 227 incident reports to NHTSA, rising to 745 when including occurrences reported directly to GM. While 22 cases resulted in crashes and six people were injured, there have been no fatalities.

NHTSA identified affected models including the 2023-2026 Cadillac Lyriq, Chevrolet Colorado, GMC Canyon, Buick Enclave, and various EVs like the Blazer EV and Equinox EV. The list also includes the Cruise Origin, GMC Acadia, Cadillac Celestiq, Optiq, Acura ZDX, and Honda Prologue.