Conditions for Clearing the MIL/DTC

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

The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
A History DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using a scan tool.