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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 P2457 >> 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
  2. Verify DTC P0071, P0072, P0073, P0074, P00C7, P0101, P0102, P0103, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0335, P0336, P0405, P0406, P040B, P040C, P040D, P040E, P041B, P041C, P041D, P041E, P049D, P0722, P0723, P111E, P1428, P142A, P2227, P2228, P2229, P2230, P245C, or P262B is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify that none of the conditions listed below exist:
    • Low engine coolant level
    • Contaminated engine coolant
    • Damaged, leaking, or restricted engine cooling system
    • Damaged, leaking, or restricted EGR cooler and cooler pipes/hoses
    • Disconnected, damaged, or missing EGR cooler bypass valve linkage
    • EGR cooler bypass valve binding or stuck
    • If a condition is found 

      Repair as necessary.

    • Go to next step: If no condition is found 
  4. Verify that DTC P2457 is not set.
    • If the DTC is set 
    1. Clear all DTCs with a scan tool
    2. 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.
    3. Verify that DTC P2457 is not set.
      • If a DTC is set, clean or replace the EGR cooler
      • Go to next step: If no DTC is set.
    4. All OK.
    • Go to next step: If no DTC is set 
  5. All OK.
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