What is a Passlock / Passkey / VATS system?

What is a Passlock / Passkey / VATS system?

It’s GM’s factory engine immobilizer. Depending on the year/model it may be called Passkey, VATS, Passlock, etc., but they all work by checking a signal from the key/lock and then sending an “OK” signal to the engine computer to allow fuel.

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    • Will it also bypass Passkey 2 and 3?

      Yes. The PRO Module is designed to work with VATS, Passkey (including 2 and 3), Passlock and Passlock 2, and all related GM immobilizer architectures on the supported vehicles.

    • What is a Passlock bypass resistor?

      A resistor “bypass” is a partial fix that only tricks the system into thinking the right key is present. It still relies on the original theft‑deterrent module to send the final “OK” signal, so when that module fails, the resistor trick stops ...

    • Why Is The Security Light On In My Car?

      On many GM/Isuzu vehicles, a steady or flashing security light usually means the factory immobilizer (Passkey/Passlock/VATS) is seeing a problem with the key, lock cylinder, wiring, or theft‑deterrent module and may start disabling the engine.

    • Should I try servicing the theft‑deterrent system instead of bypassing it?

      You can, but most customers come to us after spending significant money on keys, cylinders and modules that fail again. Our approach is to bypass the failure‑prone system entirely so it can’t strand you again.

    • Why does my car start and then die after a few seconds?

      That pattern is classic for an immobilizer fault: the engine starts, then the security system cuts fuel because it doesn’t see the “OK to run” signal from the Passkey/Passlock module.