P2452
Diesel Particulate Filter Pressure Sensor Circuit
A general electrical fault on the DPF differential-pressure sensor circuit. Without a valid pressure reading the ECU cannot estimate soot load and may inhibit regeneration.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
Ordered by how often each turns out to be the cause.
- DPF pressure sensor failedCommon
- Sensor sample hoses clogged with sootPossible
Parts involved
- DPF Differential Pressure Sensor
- DPF Pressure Sensor Wiring
P2452 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.