2026 Cadillac Lyriq Problems

On October 28, 2026, my spouse was driving our 2026 Cadillac LYRIQ Premium Luxury RWD on the highway when the vehicle unexpectedly displayed a warning and began losing propulsion, progressively decelerating without driver command. Multiple additional warnings appeared, including Service Traction Control, Service Battery, Brake System Failure, and a 62 mph maximum speed restriction. The driver was overwhelmed by the rapidly appearing warnings and unexpected deceleration. She believes she was able to use the brakes, but cannot reliably recall the vehicle's precise braking behavior during the incident. After the vehicle stopped, she contacted OnStar. During the call, the vehicle experienced a complete apparent electrical shutdown: the displays went dark, the vehicle became unresponsive, and the OnStar call disconnected. Around the time of the incident, OnStar generated two diagnostic notifications: a critical electric drive unit malfunction with diagnostic trouble code P0560, followed approximately two minutes later by a low 12V battery warning. The vehicle could not be restarted or driven and required towing to an authorized Cadillac dealership. This unexpected loss of propulsion and subsequent complete electrical shutdown created a significant safety hazard. The underlying cause has not yet been determined.

7/16/2026 I was at Powerhouse gym hall road clinton township Michigan. I was backing out of parking space had seat belt on placed into reverse checked backup screen clear, rear view mirror and mirrors on doors. Backed out half way and rab automatic braking slammed (( twice in a row)) felt like hitting brick wall no one or obstacle near car or behind me. The car starts to go forward with in a foot front automatic braking detects car next to me slams on braking system pushes car back, Car then begins to rock between two sensor back and forth, Until front system fails to stop I sense its about to move forward an impact cars around me. Depressed brake to the ground it failed to stop, Screen flickers turns blank and I have no way to power off car, It proceeds to hit four parked cars and this cars cause damage to cars next to them. I seen article 8.27.2026 regarding GM investigation describing what I experienced currently NHTA is invetigation ?? I do not know my next step s Im being held responsible by insurance, Clinton Twp , Mi police gace me reckless driving ticket im going to court 9.3.26 to contest and there ordering driving review. I have driven 40 years no accidents tickets or violations. Now it seems Im have already been convicted guilty until I prove issue with car. 2026 Lyric

The contact owns a 2026 Cadillac Lyriq. The contact stated that while performing a three-point turn at approximately 5 MPH, the brake pedal was depressed; however, the brake pedal became hard, the vehicle failed to stop, and continued moving forward and backward continuously, resulting in a collision with an unoccupied, parked vehicle. In addition, the contact stated that prior to the incident, the vehicle sensing system was overly sensitive, causing premature stopping while coming to a stop. The contact stated that the failure was associated with NHTSA Action Number: EA26006 (Service Brakes). The manufacturer was notified of the failure by phone, filed a case, and referred the contact to the dealer for diagnostic testing. The insurance company was notified of the incident. The failure mileage was approximately 10,000.

MALFUNCTION: In normal driving mode the stop lamp / brake lights do not shut off after releasing the braking controls. The stop lamps will shut off only after the accelerator pedal is used, or when the vehicle coasts below 10mph. SAFETY: 1) When descending mountain roads the stop lamps remain illuminated for extended periods of time. In some cases the stop lamps remain illuminated for hundreds or thousands of feet after the brake controls have been released. In these situations the vehicle is now coasting downhill and NOT decelerating. In these situations there is no indication / communication provided to the traffic behind me that I am now braking and no longer coasting since the stop lamps have remained on since the previous braking event. 2) In addition, I am unable to communicate to vehicles behind by flashing my stop lamps multiple times by multiple taps on the brake pedal. The first use of the brake controls cause the stop lamps illuminate and they will remain illuminated until I use the accelerator. CONFIRMED: I have communicated with my local Cadillac dealer and they have confirmed this takes place, and they call it a 'feature' of the vehicle. THIS IS NOT: One Pedal Driving. The stop lamps illuminate correctly in this setting. Adaptive Cruise Control. The stop lamps illuminate correctly in this setting. Automatic Collision Avoidance. The stop lamps illuminate correctly in this setting.

7/16/2026 I was at Powerhouse gym hall road clinton township Michigan. I was backing out of parking space had seat belt on placed into reverse checked backup screen clear, rear view mirror and mirrors on doors. Backed out half way and rab automatic braking slammed (( twice in a row)) felt like hitting brick wall no one or obstacle near car or behind me. The car starts to go forward with in a foot front automatic braking detects car next to me slams on braking system pushes car back, Car then begins to rock between two sensor back and forth, Until front system fails to stop I sense its about to move forward an impact cars around me. Depressed brake to the ground it failed to stop, Screen flickers turns blank and I have no way to power off car, It proceeds to hit four parked cars and this cars cause damage to cars next to them. I seen article 8.27.2026 regarding GM investigation describing what I experienced currently NHTA is invetigation ?? I do not know my next step s Im being held responsible by insurance, Clinton Twp , Mi police gace me reckless driving ticket im going to court 9.3.26 to contest and there ordering driving review. I have driven 40 years no accidents tickets or violations. Now it seems Im have already been convicted guilty until I prove issue with car. 2026 Lyric

Adaptive Cruise Control (ACC) caused dangerous unintended acceleration. This model of vehicle has an ACC that maintains following distance from a leading vehicle. It will decelerate to a full stop and will resume after a full stop while maintaining a proper following distance when prompted by a brief push on the accelerator. At the beginning of this incident, my ACC was set to about 40 MPH and I was following the car in front of me. At a traffic light, I came to a full stop behind the leading car for 10-15 seconds. At this point, I realized that the left lane turn signal changed to green which would allow me to proceed. Since there was no traffic in that lane, I decided to move from my lane to the open left lane. I turned the steering wheel to go around the car in front of me into the left lane. I then briefly touched the accelerator. The result was that the car accelerated at a high pace. Since my foot on the accelerator initiated the event, it took me a second or so to move my foot to the brake and disable ACC. During the acceleration, I was able to steer into the left lane and make the subsequent left turn without incident. I'm unlikely to make this mistake again. However, I'm pretty certain that this sequence is easily repeatable should you want to test for it. This ACC behavior seems dangerous. I expect that resuming ACC while following a vehicle will result in acceleration. But if the car is pointed in a new direction while it is stopped, it seems inappropriate to allow the ACC to resume by tapping the accelerator. A better ACC behavior would disable the"resume after a full stop" functionally if the wheel is turned more that a few degrees after an ACC controlled full stop.

MALFUNCTION: In normal driving mode the stop lamp / brake lights do not shut off after releasing the braking controls. The stop lamps will shut off only after the accelerator pedal is used, or when the vehicle coasts below 10mph. SAFETY: 1) When descending mountain roads the stop lamps remain illuminated for extended periods of time. In some cases the stop lamps remain illuminated for hundreds or thousands of feet after the brake controls have been released. In these situations the vehicle is now coasting downhill and NOT decelerating. In these situations there is no indication / communication provided to the traffic behind me that I am now braking and no longer coasting since the stop lamps have remained on since the previous braking event. 2) In addition, I am unable to communicate to vehicles behind by flashing my stop lamps multiple times by multiple taps on the brake pedal. The first use of the brake controls cause the stop lamps illuminate and they will remain illuminated until I use the accelerator. CONFIRMED: I have communicated with my local Cadillac dealer and they have confirmed this takes place, and they call it a 'feature' of the vehicle. THIS IS NOT: One Pedal Driving. The stop lamps illuminate correctly in this setting. Adaptive Cruise Control. The stop lamps illuminate correctly in this setting. Automatic Collision Avoidance. The stop lamps illuminate correctly in this setting.

Driver Side Headlight erratic flicker while parked. Low beam unexpectedly turns on and turns off. Causes eyeball light sensitivity upon approach and could cause epileptic seizures for some. Problem has been replicated by dealer with video evidence provided by me. First attempt to fix was to provide software updates. That did not remedy. The second attempt was a full and complete inspection of all wires and modules which were in tact followed by a full replacement of the headlight assembly. This also did not remedy. The third attempt did not perform any action and to mark the concern as "operating as intended." No warning lamps or other indications except being in front of the vehicle while it occurs.

My Cadillac Lyriq 1GYXPZRL1TZ601181 Has dents on the passenger roof rail. There are three dents one above the front door and 2 on the rear door. I discovered the dents on May 17, 2026 and I showed my local dealer on May 18, 2026. I have not been in a hail storm. My dealer said I need to file an insurance claim. Upon further research I have discovered that other owners have reported the same mysterious roof rail dents.

On October 28, 2026, my spouse was driving our 2026 Cadillac LYRIQ Premium Luxury RWD on the highway when the vehicle unexpectedly displayed a warning and began losing propulsion, progressively decelerating without driver command. Multiple additional warnings appeared, including Service Traction Control, Service Battery, Brake System Failure, and a 62 mph maximum speed restriction. The driver was overwhelmed by the rapidly appearing warnings and unexpected deceleration. She believes she was able to use the brakes, but cannot reliably recall the vehicle's precise braking behavior during the incident. After the vehicle stopped, she contacted OnStar. During the call, the vehicle experienced a complete apparent electrical shutdown: the displays went dark, the vehicle became unresponsive, and the OnStar call disconnected. Around the time of the incident, OnStar generated two diagnostic notifications: a critical electric drive unit malfunction with diagnostic trouble code P0560, followed approximately two minutes later by a low 12V battery warning. The vehicle could not be restarted or driven and required towing to an authorized Cadillac dealership. This unexpected loss of propulsion and subsequent complete electrical shutdown created a significant safety hazard. The underlying cause has not yet been determined.

On October 28, 2026, my spouse was driving our 2026 Cadillac LYRIQ Premium Luxury RWD on the highway when the vehicle unexpectedly displayed a warning and began losing propulsion, progressively decelerating without driver command. Multiple additional warnings appeared, including Service Traction Control, Service Battery, Brake System Failure, and a 62 mph maximum speed restriction. The driver was overwhelmed by the rapidly appearing warnings and unexpected deceleration. She believes she was able to use the brakes, but cannot reliably recall the vehicle's precise braking behavior during the incident. After the vehicle stopped, she contacted OnStar. During the call, the vehicle experienced a complete apparent electrical shutdown: the displays went dark, the vehicle became unresponsive, and the OnStar call disconnected. Around the time of the incident, OnStar generated two diagnostic notifications: a critical electric drive unit malfunction with diagnostic trouble code P0560, followed approximately two minutes later by a low 12V battery warning. The vehicle could not be restarted or driven and required towing to an authorized Cadillac dealership. This unexpected loss of propulsion and subsequent complete electrical shutdown created a significant safety hazard. The underlying cause has not yet been determined.