2025 Chevrolet Silverado 3500

We were pulling a 5th wheel camper on the highway at 62 mph. We experienced a series of sudden breaking sensations. Engine RPMs did not change during these events. We had been traveling for 45 minutes and decided to cancel our camping trip and return home because we were afraid of getting stranded away from home. The sensation felt like a sudden strong application of the rear brakes. It was very momentary. We turn around and shifted the transmission to "L" which limits the highest gear to 7. We did not have any more incidents. When we were close to home we shifted back to drive and the problem returned. We were concerned with a complete loss of control or motion if the problem got worse. We have an appointment to have the truck looked at next week. There were/are no diagnostics codes visible on the dash.

The vehicle was driven to a job site in Gowanda NY. The computer indicated it neede to clean the exhaust filter. The truck was parked in an open area on a blacktop parking area. The truck finished a Regen approximately 30 minutes later. The vehicle was shut down and left unattended. Approx 30 minutes later, the driver, heard noises, came around a structure and saw the vehicle was on fire. The driver did attempt to use a fire extinguisher to no avail. They then called 911 and the fire department was dispatched. The department put out the fire but the vehicle is a total loss. As this was a work site, the vehicle was towed to our shop and stored inside. The inland marine insurance company hired a fire investigator, and they looked at the vehicle. They determined the fire originated on the lower firewall in the engine compartment. He paused his investigation, to await a representative of GM to be present for destructive analysis to determine exact cause. The GM case number is XXX. This vehicle had errored multiple times and did Regen every 2-300 miles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)