A vehicle immobilization system (10) is coupled to a network system (20)
and includes a vehicle that has a speed sensor (34) generating a vehicle
speed signal, a telematics control unit (48) receiving and transmitting
signals to and from the network (20), and a speed control module (72). An
immobilization controller (30) is coupled to the speed sensor (34), the
telematics control unit (48), and the speed control module (72). The
immobilization controller (30) receives an immobilization signal from the
network (20) and sets a maximum operating speed for the power train
controller. When the vehicle speed signal is below the maximum operating
speed, the immobilization controller reduces the maximum operating speed
within the speed control module until a lower predetermined speed limit
is met. The lower speed limit is preferably greater than zero so that
some limited mobility of the vehicle may be achieved.