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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P25BD >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    After determining what caused the DTC, verify there's no engine mechanical condition.

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following component/system :
    • B23 Camshaft Position Sensor
    • B26 Crankshaft Position Sensor
    • Q17 Fuel Injector
    • Fuel System
    • Go to next step : If a related DTC is not set 
  3. Verify the condition does not exist : Engine Oil - Fill Level = Overfull
    • If the condition exists 
    1. Ignition/Vehicle - Off
    2. Verify the following conditions do not exist :
      • Q17 Fuel Injector - Leaking
      • Aftermarket equipment/accessories : Calibration/Software/Fuel System
      • Engine Oil - Contaminated
      • Fuel System - Modified
      • If a condition exists - Repair or replace as necessary
      • If no condition exists - Refer to : Diagnostic Aids
    • Go to next step : If no condition exists 
  4. Verify the following conditions do not exist :
    • Positive Crankcase Ventilation PipeorPositive Crankcase Ventilation Tube - Blocked/Ice/Kinked/Leaking/Restricted/Visible Damage
    • Positive Crankcase Ventilation Valve Orifice - Blocked/Restricted/Visible Damage
    • Positive Crankcase Ventilation Oil Separator - Blocked/Kinked/Leaking/Restricted/Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  5. Engine - Running
  6. Verify there is no abnormal noise from the component : Engine
    • Go to next step : If no abnormal noise is present 
  7. Verify the following conditions do not exist :
    • Excessive engine oil @ Charge Air Cooler
    • Excessive engine oilor Excessive Smoke @ Exhaust System
    • Excessive engine oil @ Induction System/Intake Runners
    • If a condition exists 

      Replace the component : Turbocharger

    • Go to next step : If no condition exists 
  8. 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 

      Repeat the procedure starting at step 1

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