I own a Tesla so can speak for what it does and what it doesn’t. There are two independent computer systems; one is involved in providing basic functionality and safety, and the other one is responsible for the frills like autopilot, radio, etc. So the car is designed to be drivable if the other system fails (or it is “disconnected”). And if a nuclear blast fries all electronics… god help us all. We will need no cars. The only thing operational will be the Doomsday 
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