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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0403, P1402, P1407, P140F, or P1424 >> 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 DTC P0400, P0401, P0405, P0406, P042E, P42F, P049D is not set.
    • Go to next step: If DTC P0400, P0401, P0405, P0406, P042E, P042F, P049D is not set 
  3. Perform the scan tool function: EGR Valve - Increase

    Verify the scan tool parameter: EGR Valve Position Sensor = 0 to 60% and changes

    • If not between 0 and 60% or does not change 

      Refer to: Circuit/System Testing

    • Go to next step: If between 0 and 60% and changes 
  4. 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 
  5. All OK.
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