DPF Differential Pressure Sensor Fault
Indicates a fault in the Differential Pressure Sensor of the DPF system.
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What it means (plain English)
The engine computer is getting weird readings from the sensor that measures pressure before and after the diesel particulate filter (DPF). This can make your emissions system not work properly.
What the computer is actually seeing
The sensor measures the pressure difference. If the readings are out of the expected range, a fault is logged.
What a healthy reading looks like
Pressure differential should be between 0.1 to 0.7 psi under normal operation; any value outside this range could trigger a fault.
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 differential pressure sensor for damage or corrosion. If damaged, repair or replace. Proceed if good.
- 22. Check for DPF clogging. If back pressure exceeds 5 psi at idle, consider cleaning or replacing the DPF. Proceed if clear.
- 33. Test the differential pressure sensor with a PID tool. Compare the voltage output against the expected values (approx. 0.5V at rest, rising with exhaust flow). If output is faulty, replace the sensor.
Common causes
- Wiring issues to the sensor
- Faulty differential pressure sensor
- Clogged DPF causing skewed readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
Driving is possible, but emissions may be high and performance may suffer, fix soon.
Will this fault come back?
If the root cause is not fixed, yes, the fault is likely to reappear.
Why is this code paired with SPN 3710?
SPN 3710 indicates a clogging issue in the DPF system, which can influence the differential pressure sensor readings.
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