A method and system of theft detection for a vehicle are provided. The method comprises providing a telematics module, a body control module and an engine control module disposed in the vehicle having components and at least one theft-detected state. The body control module is in communication with the telematics module and the engine control module. The telematics module is in further communication with a backend server disposed remotely from the vehicle. The method further comprises detecting at least one event by the body control module defining a theft flag. The method further comprises detecting disablement of the telematics module from one of the body control module and the backend server. The method further comprises activating the at least one theft-detected state of the vehicle when the theft flag and disablement of the telematics module are detected.