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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 P2459 >> 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 that no other DTCs are set.
    • Go to next step: If no other DTCs are set 
  3. Verify the conditions listed below do not exist:
    • Any damaged exhaust system components
    • Loose or improperly installed exhaust system components.
    • Restrictions in the exhaust differential pressure sensor ports.
    • Damaged, bent, restricted, or kinked exhaust differential pressure lines.
    • Induction system leaks.
    • Loose or disconnected charge air cooler system components.
    • If a condition is found 

      Repair as necessary

    • Go to next step: If no condition is found 
  4. Ignition ON.
  5. Verify DTC P2459 is not set.
    • If the DTC is set 
    1. Perform the Diesel Particulate Filter Service Regeneration.
    2. Verify the regeneration completed.
      • If the regeneration did not complete, replace the Diesel Particulate Filter.
      • Go to next step: If the regeneration completed

        Go to next step: All OK.

    • Go to next step: If no DTC is set 
  6. All OK.
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