Apparatus for securing a motor vehicle against theft uses a vehicle control device connected by a signaling link to a first control node of a vehicle module essential to mobilization of the vehicle, the essential module further having a power node connected to a power supply source. The apparatus comprises: an enable/disable control for conditionally disabling signaling along the signaling link, a user interface code input device communicating with the enable/disable control via a secure command link, and an armored encapsulation encapsulating the disable control and the control node and physically configured to render inoperable any of the disable control, the signaling link and the control node upon being tampered with.