Diesel Particulate Filter (DPF) Differential Pressure Sensor Circuit
Indicates a problem with the DPF differential pressure sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The DPF differential pressure sensor measures the difference in pressure before and after the DPF to see if it’s getting clogged. If there's an issue, it could mean the sensor is bad or the wiring's damaged.
What the computer is actually seeing
The ECM expects a differential pressure reading between the DPF inlet and outlet, typically around 0 to 5 volts. If the readings are out of this range or erratic, it triggers this fault.
What a healthy reading looks like
Normal differential pressure values should be between 1-3 inches of H2O at idle and can increase under load, not exceeding 10 inches of H2O.
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 the wiring and connectors for the DPF differential pressure sensor; look for frayed wires or loose connections. Decision: Are the wires intact? Yes - go to step 2; No - repair or replace wiring/connectors.
- 22. Check the DPF differential pressure sensor using a multimeter; voltage should be around 0-5 volts when the engine is at idle. Decision: Is the voltage reading correct? Yes - go to step 3; No - replace the sensor.
- 33. Verify DPF performance; if restricted, perform a regeneration or inspect for clogging. Decision: Is the DPF clean and functional? Yes - further diagnostics may be needed; No - clean or replace the DPF.
Common causes
- Faulty DPF differential pressure sensor
- Wiring or connector issues
- Clogged DPF
- Exhaust leaks before the DPF
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately severe; avoid heavy loads and schedule repairs soon.
Will this code come back after I clear it?
If the underlying issue isn’t fixed, it will likely return.
Why does this code sometimes pair with others?
Related faults often indicate common issues in the exhaust and DPF system.
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