Conditions For Clearing MIL/DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool Clear DTC Information function.