I believe the issue involved Super Cruise, forward collision warning, and automatic emergency braking systems. The vehicle is currently at the dealership and available for inspection. It has been there since 6/22/25 because the brakes and rotors are on backorder. While driving on the highway in the middle lane on a Sunday afternoon, I activated adaptive cruise after the vehicle had been parked for over 2 hours. After driving seven miles, the car suddenly jolted to a stop in the middle lane, as if we had been hit. We hadn-??t-?"but cars were forced to swerve around us at highway speeds. If traffic had been heavier, this could have caused a serious crash. I exited safely to a mall parking lot, where the car began smoking from the brake area and gave multiple warnings, including -??Reduce braking to avoid overheating.-?? The car remained parked, but the messages continued. A tow truck driver later said the brakes appeared to have caught fire because of how charred they were. I have video of the smoke and warning messages. This is a major safety concern. No. The issue has not been reproduced due to the parts being unavailable. The car has remained at the dealer since 6/22/25. Not to my knowledge. Only the dealer has had physical access to the vehicle since the incident. Just before the event, I saw a brief message on the screen, possibly -??Auto Collision Not Engaged.-?? I had used Super Cruise previously without issue. No prior warning signs appeared before this failure.

- Frisco, TX, USA