Description:

This diagnostic trouble code indicates that the DPF (Diesel Particulate Filter) differential pressure signal is unexpectedly low, pointing to a potential short to ground. This fault could lead the ECU to incorrectly assess the DPF condition, potentially underestimating the level of particulate buildup.

Reaction:

The ECU may not initiate necessary regeneration processes based on the erroneously low differential pressure reading, potentially leading to DPF clogging and reduced engine performance.

Recommendations:

• Inspect Sensor Wiring and Connections: Check for any damage or grounding issues in the wiring leading to the DPF pressure sensor.
• Test Sensor Output: Verify the differential pressure readings with a known good sensor or by using diagnostic equipment to simulate expected conditions.
• Rectify Wiring or Sensor Faults: Repair any identified issues in the wiring or replace the sensor if it is malfunctioning.
• Reset ECU and Re-calibrate Sensor: After repairs, reset the ECU to clear the fault code and recalibrate the system to ensure accurate readings.
• Monitor System Post-Repair: Ensure that the DPF system operates correctly and initiates regeneration as needed following the repair.

Note:

Maintaining accurate differential pressure readings across the DPF is crucial for optimal emission control and to prevent potential long-term damage to the filter.