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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P2452-P2456 >> 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. Engine idling.
  2. Verify the scan tool DPF differential pressure parameter is within 0 - 10 kPa (0 - 1. 5 PSI).
    • If not within the specified range 

      Refer to Circuit/System Testing.

    • Go to next step: If within the specified range 
  3. Engine idling at operating temperature, verify that the DPF Differential Pressure parameter is between 0 - 3 kPa (0 - 0. 44 PSI).
    • If not within the specified range 

      Refer to Circuit/System Testing.

    • Go to next step: If within the specified range 
  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.
  5. Verify that the DTC is not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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