Federal safety regulators have expanded an investigation into potential brake-assist failures to more than 1.1 million vehicles that use General Motors’ eBoost braking system. The National Highway Traffic Safety Administration opened Engineering Analysis EA26006 on August 21, 2026, after continuing to receive reports involving loss of brake assist. The investigation now covers an estimated 1,164,820 vehicles and expands a federal probe that initially focused on the 2023 Cadillac Lyriq. No recall has been issued, and the investigation doesn’t mean NHTSA has concluded that every vehicle under review contains a defect.
