Automotive theft has been a persisting problem around the world and greater challenge comes from professional thieves. In this paper, we present an automotive security system to disable an automobile and its key auto systems through remote control when it is stolen. It hence deters thieves from committing the theft. It also effectively prevents stealing of key auto systems for re-selling by introducing four layers of security features written in the form of firmware and embedded on the Electronic Control Units (ECUs). The details of system design and implementation are described in the paper. The experimental results show that our system is feasible and the owner can securely control his vehicle within a few seconds.