On XXX, I was involved in a collision with my 2025 Cadillac Lyriq with vin # [XXX]. in which my vehicle struck a parked car, then a tree, then a curb, in sequence, at approximately 30 mph. The vehicle continued onto the curb after the final impact. All passengers sustained injuries and required X-rays and medical treatment. There were no warning lights or dashboard indicators prior to the collision suggesting any system malfunction. During the collision, the front airbags did not deploy despite multiple significant impacts. Additionally, Automatic emergency braking didn't engage as it should Following the collision, inspection showed extensive front-end damage including damage to the tires, suspension, and cross member, hood, grill, fender etc. requiring full front-end replacement. I am requesting that NHTSA investigate the non-deployment of the airbag system and the brake failure in relation to this incident. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The contact owns a 2025 Cadillac Lyriq. The contact stated that while driving approximately 45 MPH on a four-lane highway with the cruise control deactivated, the vehicle unintendedly accelerated. The contact stated that the vehicle accelerated above 100 MPH. During the failure, the cruise control erroneously activated but the speed was not displayed. The contact attempted to stop the vehicle by depressing the brake pedal but it accelerated instead. OnStar was contacted for assistance and moments later the vehicle decelerated and was driven to the shoulder. The contact stated that the vehicle travelled approximately 3 miles before the vehicle decelerated. The contact exited the vehicle, and there was smoke coming from the wheel wells and the brake pads. A tow truck was called to the scene, and the vehicle was towed to a local dealer. The cause of the failure was not yet determined. The manufacturer was notified of the failure. The failure mileage was 10,000.
No injuries · No fire · No crash
On August 9, 2026, at approximately 3:40 a.m., while driving, the vehicle suddenly lost all propulsion and became completely disabled on the roadway. The vehicle remained powered on but would not move forward or backward. At approximately the time of the failure, Cadillac/OnStar Advanced Diagnostics generated a critical Electric Drive Unit warning instructing immediate service and reported diagnostic code P0A78. Additional vehicle diagnostic warnings involved the electric drive unit/high-voltage propulsion system. I immediately contacted roadside assistance but was unable to obtain a workable towing solution for several hours. The vehicle ultimately had to be privately towed and has remained undriveable since the incident. The loss of propulsion occurred unexpectedly while the vehicle was being driven, without advance warning that would have allowed me to safely plan for the vehicle to become disabled. I am concerned that the same sudden loss of propulsion could occur at higher speed, in traffic, at an intersection, or in another location where an unexpected loss of motive power could create a serious crash risk. The vehicle requires diagnosis and repair for the Electric Drive Unit/P0A78 condition.
No injuries · No fire · No crash
I was driving on the freeway and was between two cars. The car on my right was trying to merge into me. I immediately was breaking while trying to control steering. I attempted to honk three times and my honk horn would not work. In a case of an emergency, that is absolutely unacceptable a car like this should be able to honk.
No injuries · No fire · No crash
The infotainment screen in my car plus the menu control went completely dead. With the screen dead completely this mean you cannot see the speedomoter, rear camera feeds, warning symbols on the dash. You cannot see current speed, you cannot hear any sound so all alerting systems are down. You are completely blind in a vehicle built around this screen. Dealership has already confirmed faulty computer module. However was told it would have been originally resolved under N252500680. It has only been inspected by the manufacture. No warnings, no nothing, just dead screen out of nowhere that requires new part to bring online. Meaning dead dead; part is currently on back order and design changes were made after this exact model year showing knowledge of the fault.
No injuries · No fire · No crash