Conditions for Running the DTC: P0138

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

The engine is running.
The Ignition 1 Signal parameter is between 11-18 volts.
The modeled exhaust gas temp model is less than 800°C (1,472°F).
DTC P0138 runs continuously when the above conditions are met.