Many years ago, I was told about carjacking "prevention" method of an aftermarket alarm system. A button must be pressed upon exiting the car then at a set period of time the alarm system would kill the engine. The idea is to let the carjacker drive away and then kill the engine, rendering the car immovable yet the carjacker is far away enough so not to come back to the driver and force the driver to restart the engine.
I'd say try it in a safe area where you can pull over in the case of power loss.
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