Vehicle was driving in DRIVE mode, and began to surge as if it was regenerating hard (Felt as if downshifted quickly in a manual), which was odd since it was in DRIVE not LOW. Pulled over and placed the car in PARK. Car began to smoke (First noticed from the front underbody). Exited the vehicle and got far away. Called 911 and gave the dispatcher the information. The car lit on fire. Called 911 let them know the fire had begun. Car fully burned by the time the fire department was able to put out the fire. -What component or system failed or malfunctioned, and is it available for inspection upon request? Unknown, and it will be available for inspection if requested. -How was your safety or the safety of others put at risk? The fire could have easily killed someone and having to stand on the shoulder of a multilane highway next to a blaze was dangerous. -Has the problem been reproduced or confirmed by a dealer or independent service center? There is no vehicle left after the fire (Total loss confirmed by insurance) -Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Insurance Co. has. GM will be -Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No warning lights appeared at any time