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 working.
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Why resistor tricks and cheap bypass kits don't work permanently?
Because they leave the weakest, most failure‑prone part—the theft‑deterrent module (sometimes inside the BCM/IPC)—still in control. When that module finally fails, the car goes back to no‑start, even if a resistor or “bypass” was installed.
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.
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.
Why does my car crank but not start?
Because the problem in your car is not the starter motor, but most probaIf the starter turns but the engine will not fire, and the security light is on or has a history of flashing, the immobilizer is a prime suspect. The PRO Module is designed ...
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.