A power train control module cut off device is provided including a power train control module mounted within a vehicle for allowing the operation of the vehicle only upon the interconnection therewith. The power train control module has an I/O port connected thereto with a plurality of contacts. Next provided is a wire harness having a first end connected to the vehicle and a second end with an I/O port connected thereto with a plurality of contacts. An interconnection assembly is included with a housing having a pair of end faces. One of the end faces has a first I/O port mounted thereon with a plurality of contacts for connecting to the I/O port of the power train control module. Another one of the end faces has a second I/O port mounted thereon with a plurality of contacts for connecting to the I/O port of the wire harness. The housing has an interior space in which there is a switching mechanism. In use, the switching mechanism has a first orientation for affording interconnection between the power train control module and the vehicle and a second orientation for precluding such interconnection.