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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P2457 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON/Vehicle in Service Mode.
  2. Verify only DTC P2457 is set.
    • Go to next step: If no other DTCs are set 
  3. Verify none of the conditions listed below exist:
    • Low engine coolant level.
    • Damaged, restricted, or leaking radiator, coolant pipes or hoses.
    • Contaminated engine coolant.
    • Damaged, restricted or leaking EGR cooler or cooler pipes/hoses.
      • If any of the conditions exist 

        Repair or replace the component as necessary.

      • Go to next step: If none of the conditions exist 
  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 the DTC does not set.
    • If the DTC sets 
  6. Clean or replace the EGR cooler.
    • Go to next step: If the DTC does not set 
  7. All OK
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