P0120, P0122, P0123, P0220, P0222, P0223

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 system voltage is more than 5.23 volts.
The ignition is in the Unlock/Accessory or Run position.
DTC P0606, P0641 or P0651 is not set.
The DTCs run continuously when the above conditions are met.