Federal Regulators Escalate Probe Into GM Brake Failures

The probe centers on the company’s electronic "eBoost" brake-by-wire system, which replaced traditional mechanical links in 2019. While GM initially attributed early complaints to spindle fractures, federal investigators report continuing incidents of immediate brake assist loss that defy the manufacturer’s internal explanations. These failures force drivers to contend with extended stopping distances, a defect that has already resulted in at least six documented injuries.

The scope of the investigation now spans a wide array of models, including the Cadillac Lyriq, Chevrolet Blazer EV, and Equinox EV, as well as joint-venture vehicles like the Honda Prologue and Acura ZDX. Non-electric models, specifically the Chevy Colorado, GMC Canyon, and various Buick SUVs, are also included in the potential defect pool. Reports submitted to regulators describe harrowing scenarios, ranging from vehicles crashing through storefronts to drivers intentionally striking curbs to avoid intersection collisions. With the investigation now at the engineering analysis level, the agency is seeking to determine if the electronic system’s design flaws are more widespread than the automaker previously acknowledged.