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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2457: Exhaust Gas Recirculation (EGR) Cooler Low Efficiency >> 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 only DTC P2457 is set.
    • 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.

      • 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.
    • If the DTC does not set 
  7. All OK
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