P244A

P244A-DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE TOO LOW
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation

This diagnostic checks to make sure that the Diesel Particulate Filter is present and functioning correctly. The Powertrain Control Module (PCM) uses the Exhaust Differential Pressure Sensor to monitor the pressure differential through the Diesel Particulate Filter. The PCM will set the fault if it detects that the Diesel Particulate Filter is not present in the after treatment/exhaust system. This DTC is a two trip fault. Active regeneration of the Diesel Particulate Filter will be disabled. The PCM will turn off the MIL lamp immediately after the diagnostic runs and passes.

- When Monitored:
This diagnostic runs when the engine is running, but not during active regeneration of the Diesel Particulate Filter.

- Set Condition:
The Powertrain Control Module (PCM) will set the fault if it detects that the Diesel Particulate Filter is not present in the after treatment/exhaust system.





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

1. VISUAL INSPECTION
1. Inspect that the Diesel Particulate Filter has not been tampered with or removed.

Tampering or removal of the after treatment system has been detected?

Yes

- Install the correct after treatment system for the vehicle.
- Perform the DIESEL AFTERTREATMENT VALIDATION - 6.7L procedure. Component Tests and General Diagnostics

No

- Go To 2

2. CHECK FOR THE DIESEL PARTICULATE FILTER DIFFERENTIAL PRESSURE HOSES REVERSED
1. Start the engine.
2. With the scan tool, monitor the soot filter delta pressure reading.
3. The delta pressure should have a positive pressure reading. A negative reading indicates the hoses are reversed.

Is the Exhaust Differential Pressure Sensor reading a positive value?

Yes

- Go To 3

No

- Reverse the Exhaust Differential Pressure Sensor hoses.
- Perform the DIESEL AFTERTREATMENT VALIDATION - 6.7L procedure. Component Tests and General Diagnostics

3. CHECK FOR AN EXHAUST SYSTEM LEAK
1. Turn the ignition off.
2. Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS diagnostic procedure. Checking The Exhaust System For Leaks

Were any exhaust leaks found?

Yes

- Repair the Exhaust System leak.
- Perform the DIESEL AFTERTREATMENT VALIDATION - 6.7L procedure. Component Tests and General Diagnostics

No

- Go To 4

4. PERFORM THE AFTERTREATMENT SYSTEM INSPECTION
1. Perform the AFTERTREATMENT INSPECTION GUIDELINE - 6.7L procedure. Initial Inspection and Diagnostic Overview

Does after treatment Diesel Particulate Filter show evidence of failure?

Yes

- Replace the Diesel Particulate Filter.
- Perform the DIESEL AFTERTREATMENT VALIDATION - 6.7L procedure. Component Tests and General Diagnostics

No

- Replace the Exhaust Differential Pressure Sensor.
- Perform the DIESEL AFTERTREATMENT VALIDATION - 6.7L procedure. Component Tests and General Diagnostics