2024 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.

My Cadillac Lyriq slams the brakes on when driving forward or in reverse with nothing in its path. This makes me very nervous to drive the vehicle as it is unpredictable as to when it happens. It scares me and affects my confidence in driving the vehicle. The entire vehicle also without warning goes completely dark meaning the screen and the entire vehicle just shut off.

NHTSA ID

11775527

Incident

Oct 15, 2026

While driving, my brakes suddenly grabbed so hard that it felt as though we were hit from behind or hit a large pot hole. There was no hole, we were not hit from behind and the brakes released immediately. We were fortunate that there was no vehicle behind us as it could have caused a collision. We were not going more than 20 mph. This has happened three times in the last 4 months. Our dealership claims there is no recall or knowledge of this happening to others.

NHTSA ID

11775514

Incident

Nov 2, 2026

The contact owns a 2024 Cadillac Lyriq. The contact stated that while driving 40 MPH and attempting to depress the brake pedal, the brakes failed to respond. The contact was unable to stop in time and crashed into the vehicle ahead. While attempting to avoid crashing into the vehicle ahead, the contact steered over to the right but crashed with the other vehicle. The contact received notification of NHTSA Campaign Number: 26V717000 (Service Brakes, Hydraulic); however, the part to do the recall repair was not yet available. The failure mileage was 27,876.

NHTSA ID

11774728

Incident

Oct 24, 2026

Mileage

27,876 mi

I was parking in the garage and only tapped on the gas to move a little bit forward and the car accelerated on its own into a racking system and that racking system went through the wall of our home. I was only trying to move further up and barley touched the gas and then the car accelerated into the storage racking system

NHTSA ID

11773879

Incident

Oct 26, 2026

My 2024 Cadillac LYRIQ, VIN [XXX], has a recurring 12V/electrical problem that has caused repeated battery failures and no-start conditions. At 4,716 miles, the vehicle would not start, the dash went black, and “Service Battery Fault” appeared. Cadillac tested the 12V battery, documented that it FAILED, and replaced it. Only 367 miles later, at 5,083 miles, the vehicle displayed “Electric Drive Unit Immediate Attention” and “Limiting Features to Save Battery.” Cadillac documented code U2C11 and performed BECM/Hybrid-EV Battery Pack Communication Module programming/reset. At 12,839 miles, Cadillac documented another electrical issue: the radio and display would not turn off after the vehicle was shut off. The system required reprogramming. At 16,040 miles, the LYRIQ again became completely inoperable and had to be towed to Cadillac. The dealer again documented that the 12V battery FAILED testing and had to be replaced for the vehicle to start. I am concerned that repeated battery replacement is treating the symptom rather than correcting an underlying electrical defect. A vehicle that repeatedly loses its low-voltage electrical system and becomes completely inoperable presents a safety concern because the driver can be unexpectedly stranded. I request that NHTSA investigate recurring 12V battery, electrical-module, battery-drain and no-start failures in 2024 Cadillac LYRIQ vehicles. I have dealer repair records documenting these incidents. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11773182

Incident

Oct 17, 2026

On or about August 6, 2026, I received email communication from the GM EV Concierge , establishing Case #106606137. My vehicle has been "bricked" and GM has had possession of it since August 3, 2026, (46 days and counting) without so much as an official diagnosis or repair timeline. I have repeatedly been told that the matter has been “escalated,” that GM is “working with the dealership,” and that the repair is being “expedited,” however, I don't know to whom it has been escalated, but at this point I have not received any measurable result rather than continuous general status statements. Regardless, the practical result remains undisputed: my vehicle continues to be unavailable, my vehicle has yet to receive an official diagnosis, and I have yet been provided with a reliable repair timeline. GM continues to route my vehicle through a process that has failed to produce an official diagnosis does not resolve the underlying problem. More importantly, it does nothing to address the fact that I remain without the leased vehicle I am paying for while it is under warranty. Because GM continues to possess my vehicle, I have been required to incur over $3,000.00 in transportation and other expenses that I would not otherwise have incurred, not including the sheer amount of time my wife and I have wasted! I specifically request that GM address its own published Trip Interruption Benefits and Assistance provision. GM’s warranty and roadside-assistance states: “Trip Interruption Benefits and Service: If your trip is interrupted due to a warranty failure, incidental expenses may be reimbursed during the Powertrain warranty period. Items considered are hotel, meals, rental car, or a vehicle being delivered back to the customer, up to 500 miles.” I did not ask GM to make an unsupported goodwill payment. I asked GM to determine whether the circumstances I have experienced qualify for consideration under GM’s own published Trip Interruption Benefits and Assistance provision.

NHTSA ID

11764970

Incident

Aug 3, 2026

The vehicle is a Cadillac Lyriq. Following an over the air software update pushed by the manufacturer, the vehicle began displaying a high voltage system error message and lost the ability to DC fast charge. The high voltage components themselves are reported to be functional, the issue appears to be caused entirely by the software update rather than a hardware failure. The vehicle has been at an authorized dealership service center since August 14, 2026, awaiting a resolution. The dealership has confirmed the fault is present and is consistent with a known issue caused by the manufacturer's software update, but has not been able to repair it independently, since the fix requires a corrected software release from the manufacturer. As of this writing, the manufacturer has not issued the corrected update and has not provided a timeline for when one will be available. This creates a safety risk because the vehicle cannot be relied upon for longer trips or situations requiring DC fast charging, which can leave the driver stranded or unable to reach a destination or charging option within a safe range, particularly in hot weather conditions common in this region. The warning message and loss of fast charging capability appeared immediately after the software update was applied, with no prior symptoms. It is unknown whether the manufacturer has independently inspected this specific vehicle beyond the dealership's diagnosis. The high voltage system and charging hardware remain available for inspection upon request. Multiple other owners of this same model have reported the identical issue following the same software update, suggesting this is a widespread defect rather than an isolated incident.

NHTSA ID

11761303

Incident

Aug 14, 2026

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.

NHTSA ID

11758673

Incident

Aug 9, 2026

This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may find Diagnostic Trouble Codes B3055, B3

This Preliminary Information provides diagnostic tips and guidance for situations where key fobs cannot be learned or programmed successfully.

This Preliminary information communicates procedure to relearn window motor when it reverses when expressing up.

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

This update contains a required software change to help improve the overall software update and diagnostics process. Be sure to install this update to be able to receive future software updates. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior.

This preliminary information is to inform technicians and customers that engineering is aware of this speed sign display missing and to not replace any parts at this time.