Description:

This error indicates a problem with the relationship between exhaust flow and differential pressure across the DPF, signaling that the data from the differential pressure sensor does not match expected patterns based on current engine operation and exhaust flow conditions.

Reaction:

The ECU may engage safety protocols, such as reducing engine power or initiating unscheduled DPF regeneration cycles to manage perceived DPF blockages or malfunctions.

Recommendations:

• Calibrate DPF Pressure Sensor: Ensure that the DPF pressure sensor is properly calibrated to accurately reflect pressure differences.
• Check Sensor Installation and Wiring: Confirm that the sensor is correctly installed and that wiring is intact and free from damage or interference.
• Diagnose Exhaust System: Inspect the exhaust system for any anomalies that could affect pressure readings, such as leaks or restrictions.
• Reset ECU and Re-evaluate: After adjustments or repairs, reset the ECU to ensure all systems recognize the updated sensor states and re-evaluate the system under normal operation to ensure the error does not recur.

Note:

Correct interpretation of DPF differential pressure is vital for operational decisions regarding exhaust management and DPF regeneration. Accuracy in these readings helps maintain engine efficiency and emission control.