Conditions For Setting DTC

WARNING: This page is about a different car, the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Passlock(tm) module will inspect for a tamper code when ignition switch rotates from RUN to CRANK and will continue to monitor the signal during engine running period.
Passlock(tm) module is reading a tamper code from Passlock(tm) sensor for longer than one seconds.