Description:

This error code is set when the DPF differential pressure is recorded as too high while the engine is off. This unexpected condition might indicate a sensor fault or erroneous readings due to mechanical or electronic issues within the sensor or its circuit.

Reaction:

An incorrect high-pressure reading with the engine off could prompt unnecessary DPF regeneration attempts or warnings, potentially leading to confusion in system management.

Recommendations:

• Check Sensor and Circuit Integrity: Inspect the sensor and its circuit for faults that could generate false readings.
• Verify Sensor Accuracy: Use diagnostic tools to test the sensor’s functionality and accuracy against expected zero-pressure readings with the engine off.
• Replace or Repair Faulty Sensor: If the sensor is found to be providing incorrect data, replace it to ensure correct system operation.
• Reset ECU and Re-test System: After addressing the issue, reset the ECU to clear the fault code and re-test the system to confirm the sensor now functions as expected.

Note:

Proper functionality of the DPF differential pressure sensor is essential for accurate monitoring and management of the particulate filter, especially to avoid unwarranted maintenance actions.