Vehicle security has become one of the major problem for owners. Due to this avoiding vehicle theft is making buzz in present automatic industry. This paper is to develop an android application to dis-engage the engine of vehicle. The system has Mobile Phone that is embedded in the vehicle with an interfacing to Engine Control Module (ECM) through microcontroller (ATMEGA328), which in turn communicates to the ECM. The vehicle being stolen can be stopped by using GPS feature of mobile phone & this information is used by owner of the vehicle for further processing.