Conditions For Clearing MIL/DTC

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

The Last Test Failed status will clear when the DTC runs and passes.
The Alternative Fuels ECM will turn OFF the MIL after 3 consecutive drive trips that the DTC runs and passes.
The History status will clear after 40 consecutive WARM-UP cycles with NO failures of ANY DTC.
All DTC Information can be cleared with a scan tool.