I have a 2004 Chevrolet Impala equipped with ”Passlock” factory Theft Deterrent System. Anyway for the past couple weeks SOMETIMES I can try to start my car and it won’t do anything. No crack or click or anything. Battery is good, changed the starter and checked fuses….etc.
After researching via Google I’ve learned that year of the Impala is known for major issues with the factory Passlock system. Someone suggested using a passlock bypass module, is that possible? Or can this probably only be fixed by installing a NEW ”KEY IGNITION?” PLEASE HELP!!!!!
Answer: Yes, this is a common problem with the Chevy Impala. No, a new key will not fix the problem. There are modules . kits to bypass the system totally. If you have a non-factory security or remote on the car, this can also cause problem in the GM Passlock theft system. Best to disable that before you try to fix your car.
Most likely the problem is in the ignition switch and cylinder in the dash. This is where the Passlock sensor sends it’s signal the the BCM (Body Control Module) to allow the car to start.
We have several article relating to this problem. Click this link for more information. GM Passlock Problems
AUTO REPAIR FORUMS
Or Post Comments Further Down Page