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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 P0030-P0032, P0036-P0038, P0050-P0054, P0056-P0060, P0135, P0141, P0155, or P0161 >> 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. Perform the scan tool control function: HO2S Heater Bank 1, 2 Sensor 1, 2 - On and Off

    Verify the scan tool parameter:

    • HO2S Heater Control Circuit High Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Low Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Open Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Perform the scan tool control function: HO2S Heater Bank 1, 2 Sensor 1, 2 - On and Off

    Verify the component turns On and Off: B52 Heated Oxygen Sensor

    • If the component does not turn On and Off 

      Refer to: Circuit/System Testing

    • Go to next step: If the component turns On and Off 
  4. Verify the scan tool parameter:
    • HO2S Heater Control Circuit High Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Low Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Open Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • Perform the action while monitoring the parameter:
    • Wiggle the harness and connector: B52 Heated Oxygen Sensor
    • Wiggle the harness and connector: K20 Engine Control Module
    • If not the specified state 

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

    • Go to next step: If the specified state 
  5. 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 
  6. All OK.
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