Conditions For Clearing MIL/DTC

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2003 Hummer H2, 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, and 2003 GMC Cab & Chassis Sierra. 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 40°F (22°C) from the start-up coolant temperature and the engine coolant temperature exceeds 160°F (70°C) during the same ignition cycle.
Use the scan tool Clear Information function.