Conditions For Clearing MIL/DTC

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, and 2002 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

The PCM will turn the MIL OFF during the first consecutive trip in which the diagnostic has been run and passed.
A last test failed (current DTC) clears when the PCM turns OFF the MIL.
The history DTC will clear after the PCM runs and passes 40 consecutive warm up cycles with no failure.
The DTC can be cleared by using a scan tool.