Conditions For Clearing MIL/DTC

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

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