P04DB

P04DB-CRANKCASE VENTILATION SYSTEM DISCONNECTED

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Engine at operating temperature, driving at a steady speed. This monitor takes 10 minutes to completely run.

- Set Condition:
Crankcase Pressure readings have been significantly elevated, as compared to historic trends saved in the Powertrain Control Module.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. CHECK THE CRANKCASE VENTILATION HOSE

NOTE: If there are any DTCs present for the EGR Valve, EGR Airflow Control Valve, or any of the pressure sensors, perform the diagnostics for those DTCs before proceeding with this test procedure.

1. Visually inspect the Crankcase Ventilation Hose.

Is the hose disconnected, cracked, pinched or damaged?

Yes

- Repair or replace the Crankcase Ventilation Hose.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 2

2. CHECK THE INTAKE SYSTEM FOR LEAKS
1. Perform the INTAKE AIR SYSTEM PRESSURE TEST diagnostic procedure. Intake Air System Pressure Test

Were any Intake System leaks found?

Yes

- Perform the appropriate repair.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Replace the Crankcase Breather Filter.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.