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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P037A, P037B, or P0381 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function : Wait to Start Indicator - On and Off

    Verify the scan tool parameter :

    • Wait to Start Indicator Control Circuit High Voltage Test Status = Not Run or OK
    • Wait to Start Indicator Control Circuit Low Voltage Test Status = Not Run or OK
    • Wait to Start Indicator Control Circuit Open Test Status = Not Run or OK
    • 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 : Wait to Start Indicator - On and Off

    Verify the component turns On and Off : Wait to Start Indicator @ P16 Instrument Cluster

    • 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. Perform the scan tool control function : Wait to Start Indicator - On

    Verify a condition does not exist with the component : Wait to Start Indicator @ P16 Instrument Cluster - Turns Off

    • Perform the action while monitoring the component : Wiggle the harness and connector : X @ K20 Engine Control Module
    • If a condition exists 

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

    • Go to next step : If no condition exists 
  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 that no DTCs are set.

    • If the DTC sets 

      Refer to : Circuit/System Testing

    • Go to next step : If the DTC does not set 
  6. All OK.