INTERMITTENT PASS KEY FAULT START NO START
NO CRANK PASS KEY FAULT LIGHT ON .FOLLOW RESET PROCEDURE CRANKS STARTS.TURN OFF PASS KEY FAULT LIGHT COMES ON NO CRANK AGAIN.
This is a common problem with GMs VATS (Vehicle Anti Theft System). The cause is usually the ignition lock cylinder. The chip on your ignition key shank is a resistor block that contacts 2 tiny wires inside the lock cylinder when the key is inserted. There were 15 chip possibilities. Over time these tiny wires wear and break. When this happens the chip no longer contacts the wires and the computer can't read the key. This enables the anti theft system and shuts down the car. When you replace the lock cylinder you'll get a template for cutting new ignition keys BUT you must have the original key tested to find out which VATS number key you have (1 thru 15). Then you have to get the correct VATS key blank so that the computer will recognize it. Then use the template that came with the new lock cylinder to have the VATS key blank cut to be able to turn on the ignition and start the car. HTH. -Jim
This was my situation until it failed entirely. The key/cylinder combination were fine, but it was the control unit that went bad (in the trunk). I also learned that you ccanotnbuy a used control unit, either. When the new one is installed, a process runs which mates it to your key, the first time the car is started.
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