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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P140B or P140C >> 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 / Vehicle - In Service Mode
  2. Verify DTC P0403, P0405, P0406, P1402, P1407, P140F, P1424 is not set.
    • Go to next step: If DTC P0403, P0405, P0406, P1402, P1407, P140F, P1424 is not set 
  3. Verify the condition does not exist:
    • Air Cleaner Element - Saturated with water/Restricted
    • Exhaust System - Leaking/Missing components/Restricted - Refer to: Symptoms - Engine Exhaust
    • Intake Manifold - Leaking
    • Intake Air Duct - Loose Clamps/Cracked/Visible Damage
    • Mass Airflow Sensor - Contamination of the measuring element/Water intrusion
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step: If no condition exists 
  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.

    Verify the DTC does not set.

    • If the DTC sets 

      Replace the component: Q14 Exhaust Gas Recirculation Valve

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