Conditions for Running the DTC: P2138

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The system voltage is greater than 5.23 V.
The ignition is in the Unlock/Accessory or Run position.
DTC P0641, P0651, P2120, P2125 are not set.
DTC P2138 runs continuously when the above conditions are met.