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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0131, P0132, P0137, P0138, P0151, P0152, P0157, or P0158 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following system/component: HO2S Heater
    • Go to next step: If a related DTC is not set 
  3. Engine - Running
  4. Verify the scan tool parameter: HO2S Bank 1, 2 Sensor 1, 2 = 50 to 1, 050 mV
    • If not between 50 and 1, 050 mV 

      Refer to: Circuit/System Testing

    • Go to next step: If between 50 and 1, 050 mV 
  5. Verify the scan tool parameter: HO2S Bank 1, 2 Sensor 1, 2 = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: X2 & X3 @ B52 Heated Oxygen Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If the value spikes or drops out 

      Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

    • Go to next step: If the value does not spike or drop out 
  6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  7. All OK.
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