The contact owns a 2022 Cadillac CT4. The contact stated that while driving approximately 60-65 MPH, the power steering and power brakes failed to operate as needed. The check engine and the crash warning lights were illuminated. The contact coasted to the side of the road while depressing the brake pedal with an excessive amount of force. The vehicle was stopped by bumping on a nearby curb. Once the vehicle was stopped, the contact turned off and restarted the vehicle and was able to regain power steering and power brakes functionality. The check engine warning light remained illuminated. The failure had occurred twice. The vehicle was taken to the dealer where it was diagnosed that the vehicle was showing 24 failed Communication codes; however, the exact cause of failure was unknown. The battery was replaced by the dealer after the first failure however, after the failure recurred no additional repairs had been performed. The manufacturer was made aware of the failure a complaint was filed. The contact was referred to the dealer for further assistance. The failure mileage was 9,000.

Source: NHTSA complaint ODI #11567176 · view all complaints for this vehicle at nhtsa.gov

The problem first arose in June 2023. I was driving and suddenly, all the dashboard lights went on and the brakes stopped working. There was no pressure on the pedal. I was able to roll to a stop without incident. I turned the car off and back on again and the brakes worked but the check engine light was still on. I was able to limp the mile back to my house. After almost 6 weeks at the dealer, I was told they replaced a brake module and the car was fine. On [XXX], it happened again. It was towed to the dealer and I refused to drive it again. The car had about 2400 miles on it. They took it back, although claiming nothing was wrong, and I bought the CT4V Blackwing 2023 VIN [XXX] . On [XXX], it happened in the new car (500 miles on it). The dashboard lit up, the brakes wouldn't work, although this time instead of no pressure on the pedal, it was hard as a rock. After turning it on and off again, the brakes worked but the speed was restricted and other things in the car did not seem to be working correctly. The check engine light was also on. The dealership towed it. They told me they could not recreate the problem. Weeks later, I was told that an engineer from GM was looking at it. I received a call from some customer support department person who eventually told me that there was nothing wrong with the car, that the brake failure was a result of the Allstate Milewise device that was plugged in and they would not do anything for me. My husband has a Milewise in his Chevy truck with no issues. I found a forum online discussing this problem which has apparently happened to numerous people in CT4V and Blackwings. I also spoke to Allstate which does not have any reported problems with the device. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Source: NHTSA complaint ODI #11564720 · view all complaints for this vehicle at nhtsa.gov

While driving at higher speeds the multiple CT4 vehicles that I have driven share steering issues. While driving straight, there are no issues. If following gentle bends in the highway to the RIGHT, randomly the vehicles will increase the force required to maintain the current ground track. This causes the vehicle to slightly pull away from the desired track to the left. It does NOT occur when steering to the left, only to the right. It feels as if the steering enters a different type of steering mode and eases the required steering wheel pressure when the vehicle returns to straight driving. The fact that this steering is sour is randomly timed, only occurs in one direction leads me to believe that it irks an engineering problem. I have found this issue to present itself on the CT4 and CT5. I have personally driven the vehicles as well as confirmed the issue with sources online. I do not feel that this issues constitutes a safe steering feedback.

Source: NHTSA complaint ODI #11498610 · view all complaints for this vehicle at nhtsa.gov

Sept 4 2024 my husband was involved in a motor vehicle accident involving a gravel hauler that hit him twice once in the rear then in drivers side that cause my husband to spin out of control hitting another vehicle none of the airbags deployed My husband should have been killed or severely injured by the grace of God he was not

Source: NHTSA complaint ODI #11613882 · view all complaints for this vehicle at nhtsa.gov