2025 Cadillac Lyriq

On April 11, 2024, the Office of Defects Investigation (ODI) opened Preliminary Evaluation PE24011 after receiving complaints concerning a loss of brake assist in 2023 MY Cadillac Lyriq vehicles. These complaints allege a hard brake pedal, followed by a “Brake System Failure” message at start up or while driving. GM shared records regarding several internal investigations for loss of brake assist due to alleged spindle fractures in the eBoost system. GM has stated that in the event of a spindle fracture, anti-lock brakes (ABS), stability control, and traction control remain functional until the vehicle comes to a complete stop. At this point, ABS, brake assist, stability control, and traction control functions are lost. The loss of these functions causes the vehicle to set one of three Diagnostic Trouble Codes (DTCs) based on failed performance criteria for the Electronic Brake Control Module (EBCM). These DTCs, in turn, activate several driver alerts: an audible chime, a visual “Service Brake System” message in the display, and multiple illuminated Malfunction Indicator Lights (MILs) for the ABS, Traction Control, and Brakes informing the driver of loss of functionality. The vehicle speed will also be limited to 70 KPH (43 MPH). Since opening PE24011, ODI has continued to receive reports of loss of brake assist. Some of these reports describe symptoms inconsistent with GM’s description of a spindle failure. These reports allege an immediate loss of brake assist functionality as opposed to the loss occurring after the vehicle comes to a complete stop. The sudden loss of brake assist during a braking event could result in extended braking distance, which increases the risk of a crash or injury. ODI believes further analysis is necessary to assess the potential for failures in GM’s eBoost system to resulting in safety-related outcomes. At this time, ODI is aware of the following vehicles that are equipped with this eBoost system: 2023-2026 MY Cadillac Lyriq, Chevrolet Colorado, and GMC Canyon; 2024-2026 MY Buick Enclave, Envision; Chevrolet Blazer EV, Equinox EV, Traverse; Cruise Origin; and GMC Acadia; 2025-2026 MY Cadillac Celestiq and Optiq. ODI is also aware of 2024-2026 MY Acura ZDX and 2024-2026 MY Honda Prologue vehicles that were built with this system. The Acura and Honda vehicles were manufactured by GM in a joint venture with Honda, and will be included in the Engineering Analysis as peer vehicles. ODI is opening this Engineering Analysis to further assess the safety-related consequences of a failed eBoost system. In addition, ODI is expanding the scope of the investigation to encompass all GM vehicles that share this eBoost system. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.

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)

NHTSA ID

11759823

Incident

Jul 31, 2026

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.

NHTSA ID

11759406

Incident

Aug 13, 2026

Mileage

10,000 mi

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.

NHTSA ID

11757615

Incident

Aug 18, 2026

I did some online research and am concerned that the accident may have been caused by a safety issue reported on our 2025 model Cadillac Lyriq involving its One Pedal Driving (OPD) feature. We had tried using OPD when we first got the car and didn't like it and have not engaged it again over the past year. However, after an Over The Air update last week, the feature seems have been engaged by itself. I noticed it the evening before and needed to research how to disengage. In the mean time my wife had to go out before I was able to disengage it, and not realizing the issue was anything but undesirable she went out to an appointment and had an accident pulling into a parking spot at Walgreens. The car surged forward into some small bushes and a small causing damage to the front bumper, grill cover, and several other pieces. No one was hurt, but the risk is obvious.

NHTSA ID

11750061

Incident

Jul 10, 2026

Stopped at the West Bound Thruway Seneca service area. After returning to the vehicle, multiple error messages were displayed on screen. "Have Power Steering Serviced, Service Stabilitrak, Service Headlamps, AWD Tempoarily Unavailable" Steering was the main issue. It was almost impossible to turn and steer. It was fortunate that it was after a stop and not while driving. The vehicle was towed to the dealer but it has yet to be determined why the steering failed.

NHTSA ID

11743028

Incident

Jun 6, 2026

OnStar system on the vehicle is busted. Because of this the accident detection no longer works and the GPS is stuck in no mans land which makes it impossible to use their app to figure out charging percentage, how far and route to take to the nearest charging station.

NHTSA ID

11732073

Incident

Nov 7, 2025

Car has been asleep after parking and will not wake up leaving all electrical components dead. GM has not been able to repair and unfortunately this has occurred 5 times including twice the month of March, 2026. Having a car parked in an unsafe location and not being able to move it very unsettling. After 30-60 minutes the car will start back up and operate normally.

NHTSA ID

11727295

Incident

Mar 26, 2026

The contact owns a 2025 Cadillac Lyriq. The contact stated that after starting the vehicle, there was a cracking sound inside the vehicle. The contact looked up and saw that the moon roof glass was cracking. The contact stated that the crack had extended several feet. There was no impact on the moon roof glass to cause the glass to crack. The local dealer and manufacturer were notified of the failure, but no assistance was provided. The failure mileage was 6,000.

NHTSA ID

11724156

Incident

Feb 10, 2026

Mileage

6,000 mi

If a vehicle has an issue with super cruise inoperative tech is directed to follow a diagnostic path before replacing the Image processing module.

This PI is to instruct dealer on diagnostic procedures that need to be completed prior to replacing a radio or IPC display

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

This preliminary information is to inform technicians and customers that GM is aware of the issue and the vehicle can still be driven. When a repair is available, this PI will be updated.

This Preliminary information communicates how to move U018B from Current to History.

This preliminary information is to inform technicians that GM is placing the B174W Front View Camera Module (ACP2) on part restriction due to elevated replacement rates and ongoing engineering investigation. Technicians must not replace the front camera module unless they have: 1.Completed the diagnostic procedure in this PI, and 2.Contacted TAC and received authorization, including the SI document number and specific step that directs camera replacement.