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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P1428 or P142A >> 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. Verify there are no DTCs set related to the following component/system :
    • B34 Engine Coolant Temperature Sensor
    • B66 Intake Air Temperature Sensor
    • B75C Multifunction Intake Air Sensor
    • Fuel System
    • Go to next step : If a related DTC is not set 
  3. Verify the scan tool parameter : EGR Temperature Sensor 1, 2 = -39 to 999°C (-38 to 1, 830°F)
    • If not the specified value 

      Refer to : Circuit/System Testing

    • Go to next step : If the specified value 
  4. Verify the scan tool parameter : EGR Temperature Sensor 1, 2 & IAT Sensor 2 = Not within 20°C (36°F) of each other
    • If not the specified value 

      Refer to : Circuit/System Testing

    • Go to next step : If the specified value 
  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.