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
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
This is about an issue with the ACC system. While driving with the ACC engaged, it will intermittently disengage and without notification. Then the vehicle applies hard braking. After many multiple occurrences, I now tap the brake pedal and apply acceleration. I can't tell you how concerning this can be while driving at interstate speed. Just the thought of a large truck behind me will put the fear into you. Additionally, I have been able to hear an electrical clicking noise emitting from the left side of the steering wheel. When this occurs the ACC is unavailable and/or unable to be selected. A barrage of notifications will appear saying the Adaptive Cruise Control Selected or Cruise Control Selected. Our Lyriq has been in the shop for this problem at least 3 times. Everytime the outcome is CND or WAD
No injuries · No fire · No crash
In the past 18 months the vehicle has experienced phantom breaking while driving 3 times. Each time there were no vehicles within 30 or more feet from the vehicle. All 3 times occurred while driving the vehicle and going between 20-40 mph. The vehicle engaged in an emergency break and stopped the car in the road. All three times could have resulted in a major accident as it occurred on busy roadways. This last time it happened in the middle of an intersection with no vehicles around me or behind me. This is a major safety concern and put my family and I in a potentially dangerous situation that could have caused major injuries to myself, my family and others around us. The vehicle is currently with Cadillac being inspected. During conversations with Cadillac they said this is a known issue and suggested that I turn the mechanism off and bypass the safety feature to avoid it from happening again. This is not a systematic fix. This is a bypass. We purchased the car for the safety and security and how sophisticated the safety mechanisms are and we have now been told as a suggestion to simply bypass it. This is very concerning on a national level of That the vehicle is known for doing this. We no longer feel safe in this vehicle The dealer has not confirmed if they have gotten it to duplicate. The only updates we have is that they are still working on the diagnostic testing. There were no warnings prior to the phantom breaking taking place.
No injuries · No fire · No crash
Component Involved: Steering Wheel Assembly (Super Cruise Steering Wheel Light Bar / Rim)Safety Defect Description:The plastic insert covering the Super Cruise LED light bar and the surrounding leather wrap located directly on the top rim of the steering wheel are breaking apart, peeling, and separating. This is an immediate and severe driving safety hazard. While executing turns and maneuvering the vehicle, the driver’s hands and clothing sleeves are actively getting caught and snagged on the exposed, broken plastic edges and peeling wrap on the wheel rim. This causes physical interference and sudden, unexpected entrapment of the driver's hand or clothing during active steering.Consequences of the Defect:This defect presents an imminent risk of a vehicle crash due to sudden mechanical restriction of the driver's hands. If a driver’s sleeve or fingers become trapped or snagged by the peeling steering wheel trim while negotiating a sharp turn, curve, or emergency evasive maneuver, they will be unable to smoothly rotate the wheel, leading to a direct loss of steering control.
No injuries · No fire · No crash