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Old 07-18-2014, 12:47 PM   #6
Bigdav160
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Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
Re: 5.7 with 4l80e in 1969

I just read that 1998 was the first year for Passlock in the trucks. IIRC, this system "marries" the lock cylinder to the PCM. There is a hall effect sensor in the lock cylinder that has to see a key rotate to start.

I'm sure this system can be defeated pretty easily. Do a search
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