Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the DTC information with a scan tool. Verify no HO2S heater DTCs are set.
- If a HO2S heater DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Engine running, observe the appropriate scan tool HO2S voltage parameter. The reading should be within the range of 50-1, 050 mV.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.