[BNaylor]

When the theft deterrent module (TDM) detects an abnormal resistance value from the key and ignition lock cylinder in a Passkey II VATs system it will cutoff fuel supply by disabling fuel injection pulse width modulation and the starter so that is a possibility.

You may be able to bypass the starter circuits but I don't think you can bypass fuel injection pulse width modulation so it will probably still not start/fire up.

However, there are other bypass procedures if it is a key and igniton lock cylinder problem. If a problem is troubleshot to the TDM then that module will need to be replaced outright.