Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The system voltage is more than 7 volts.
The ignition is in the Unlock/Accessory or Run position.
DTC P2122 and P2123 run continuously when the above conditions are met.