Conditions for Running the 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.

The ignition is in the Crank or Run position.
The system is not in Battery Saver mode.
The ignition voltage is more than 5.23 volts.
The communication between the TAC module and the PCM must be valid.