Conditions for Setting the DTC: P0138
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The ECM detects that the sensor voltage parameter is more than 1050 mV.
- DTC P0138 sets within 100 seconds during the rich test when the above condition is met.