Conditions For Clearing MIL/DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

PCM will turn OFF the Malfunction Indicator Light (MIL) during the third consecutive trip in which the diagnostic runs and passes.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
DTC can be cleared by using scan tool.