Conditions for Setting the DTC: P0138
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The ECM detects that the HO2S 1 voltage parameter is more than 1,050 mV.
- DTC P0138 sets within 100 seconds during the rich test when the above condition is met.