Most of the people having their own vehicle, theft happen in insecure parking places. The safeties of vehicles are extremely essential for public vehicles. Vehicle tracking and locking system installed in the vehicle, to track the place and locking engine motor. The place of the vehicle identified using Global Positioning System (GPS) and Global System Mobile communication (GSM). These systems constantly watch a moving Vehicle and report the status on demand. When the theft identified, the responsible person send SMS to the microcontroller, then microcontroller issues the control signals to stop the engine motor. Authorized person need to send the password to microcontroller to restart the vehicle and open the door. This is more secured, reliable and low cost. As the crime rate is going up, security system for vehicles is extremely essential. The GPS/GSM based system is one of the most important systems, because of its applications over a wide usage of millions of people throughout the world.