While driving on a major highway and traveling at 80 mph or so, the vehicle flashed a warning light saying “Press Start Again.” I noticed the gas pedal was no longer responding and the RPM gauge dropped to zero. The vehicle shifted itself into neutral and I was forced to steer the truck to a shoulder and scraped the underside of the front ground effect trim. The vehicle then shifted into park and would not start. When a tow operator arrived, the vehicle could not be shifted into neutral to be towed and the electric parking brake kept activating by itself while trying to load and unload the vehicle from the flatbed. The vehicle is now completely immobile and I’m waiting for information from the dealership.