Conditions for Running the DTC

WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The battery voltage is more than 10 volts.
The ignition is ON.
The accelerator pedal is not in the rest position.
DTC P2138 run continuously once the above conditions are met for more than 5 seconds.