Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2002 GMC Safari, 2002 Chevrolet Astro, 2001 GMC Safari, and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles.
A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle.
Use the scan tool Clear Information function.