P2454
Diesel Particulate Filter Pressure Sensor Circuit Low
Voltage on the DPF differential-pressure sensor signal line is below the lower threshold. Typically a short to ground or an open in the supply line.
- 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.
- Signal wire shorted to groundCommon
- Reference voltage line openPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- DPF Differential Pressure Sensor
- DPF Pressure Sensor Wiring
P2454 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.