"If the driver does not make a Vehicle Test to regain control of the vehicle in one Combat Turn, one of two things happens. First, if the vehicle has a Pilot rating, the vehicle’s autopilot kicks in and takes the necessary Complex Action to drive the vehicle. If this happens, the autopilot system begins driving with the flow of traffic. Second, if someone has disabled the Pilot program or the vehicle does not have one, it continues to travel in its last heading and is unable to defend against any incoming attacks. It takes no actions except for slowing down, or if the accelerator is locked, maintaining speed until the gamemaster says it crashes."
p. 202 core