Conditions For Clearing MIL/DTC

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. 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 drive trips when the test has run and passed.
A history DTC clears after 40 consecutive warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 40° F (22° C) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 158° F (70° C) during the same ignition cycle.
Clear the DTC with a scan tool.