Diesel Particulate Filter Pressure Sensor Range/Performance Problem
The pressure sensor on the diesel particulate filter has readings that are out of range or inconsistent.
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What it means (plain English)
The car's computer is saying that the pressure sensor reading on the diesel particulate filter isn’t normal—it might be reading too high or too low, which can affect exhaust flow and emissions.
What the computer is actually seeing
The engine control module (ECM) monitors the differential pressure across the diesel particulate filter (DPF) using sensors. If the pressure values deviate too far from expected levels, it triggers this code.
What a healthy reading looks like
The expected differential pressure across the DPF during normal operation should typically be between 0.5 to 2.5 kPa at idle and can rise to 5-10 kPa under load, depending on the engine condition and filter regeneration state.
Guided diagnostic — the DiagCoach way
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.
- 11. Inspect wiring and connectors to the DPF pressure sensor for damage or corrosion. If found, repair or replace.
- 22. Check DPF for excessive soot build-up or blockages. Perform a DPF regeneration if required and evaluate performance again.
- 33. Measure the actual differential pressure using a scan tool or pressure gauge. Compare the values to expected values. If readings are out of range, consider sensor replacement.
- 44. Verify any recent repairs or modifications that could have affected exhaust flow, such as exhaust pipe restrictions or a malfunctioning EGR system. Test each component individually.
Common causes
- Faulty DPF pressure sensor
- Blocked or partially clogged DPF
- Wiring or connector issues to the sensor
- Incorrect engine parameters affecting pressure readings
- Failure in the ECM or calibration issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's best not to drive for long distances; if excessive soot is present, it could lead to a DPF blockage and cause significant engine issues.
Will this code clear on its own?
Not likely; you'll need to address the underlying issue for the code to clear and prevent it from returning.
What other symptoms might I notice?
You may experience reduced engine power, increased emissions, or a DPF warning light on the dashboard.
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