Swiss researchers hacked into eight automakers’ remote-entry systems. The setup for hacking is easy, but not simple, the researchers found. The thieves can, in fact, start those vehicles because the same signal that opens the doors also tells the push-button system it’s OK to start the car when somebody pushes the button. No coding system could stop it, the Swiss researchers said. If your car has a remote that still requires a key, the bad guys can’t start it easily, even though they can open the doors.
Source: https://thehackernews.com/2011/01/car-thieves-can-easily-hack-remote.html