It is really quite simple: Modern cars are controlled by computers — everything, from the accelerator to the brakes to the steering to the windows to the locks — take over the computer, you take complete control over the car.
The idea of hacking a car is no longer fantasy. It is real. It can be very deadly.
Way back in 2011, I wrote a couple of posts about whether hacking a car would violate the Computer Fraud and Abuse Act. I really was being a bit silly when I first thought of this as I was just looking for a creative way to make a point. At first I did not really think that hacking a car was possible. I now know that it certainly is. And yes, I believe that hacking a car would violate the CFAA.
In the August 12, 2013 issue of Forbes, hackers not only explain how to hack a car, but show you what happens in a video. You really need to watch the video in this article: Hackers Reveal Nasty New Car Attacks–With Me Behind The Wheel (Video)