Conditions For Clearing MIL/DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana Special, 2001 GMC Savana Camper Special, and 2001 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.

The current DTC will clear after an ignition cycle occurs without the fault recurring.
The Passlock module history DTCs clear after 100 ignition cycles with no current codes active.
Using a scan tool.