Diesel Particulate Filter (DPF) Pressure Sensor Range/Performance Problem

The DPF pressure sensor measures how clogged the diesel particulate filter is. If the sensor reads too low or high, it indicates a problem with the DPF, which can lead to increased emissions and poor performance.

The engine control module (ECM) expects the DPF pressure sensor to provide readings within a specific range based on vehicle operation conditions. If it reads under a certain threshold (typically below 0.2 volts under load) or over a certain threshold (over 4.5 volts), it triggers this code.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Inspect the wiring and connectors at the DPF pressure sensor for damage or corrosion. Repair or replace as necessary. DECISION: If wiring is good, proceed to step 2; if not, fix wiring and retest.
2. 22. Check the diesel particulate filter for excessive soot accumulation. If filter is clogged (flow rate below 200 cfm), consider cleaning or replacing it. DECISION: If filter is clear, proceed to step 3; if clogged, fix filter issue first.
3. 33. Use a scan tool to retrieve live data from the DPF pressure sensor. Ensure it is operational and readings correlate with engine load. DECISION: If readings are within expected range, sensor is likely good; if readings are erratic or outside of range, replace sensor.

• Faulty DPF pressure sensor
• Clogged diesel particulate filter
• Wiring issue between sensor and ECM
• Exhaust leak affecting sensor readings
• Poor engine performance affecting DPF operation

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