Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
In order to clear the DTC from a current status the ignition must be cycled and the voltage shall be greater than 9 volts.