Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The ignition must be in the RUN or ACC position.
The system voltage is at least 9.5 volts and no more than 15.5 volts.
All the above conditions are present for greater than 15 seconds.