P2454Diesel Particulate Filter Pressure Sensor A Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The particulate filter pressure sensor is a three-wire part: the ECM feeds it 5 V and ground and reads a signal that rises with the pressure difference across the filter. P2454 means that signal sits below the lowest plausible value. Ford's 2023 diesels fail below 0.10 V within 2 s, where 0.45 V corresponds to zero pressure difference; GM's 2018 diesels fail below 3 % of the supply with 80 of 160 samples. On the Opel/GM 2.0 CDTi in the Saab 9-5 (2010) an open circuit sets P2454 as well as a short to ground, after 2 s, so a disconnected plug reads low there. A shorted 5 V reference can also pull the signal down and usually sets P0641 alongside. Audi (Q7 TDI 2009 to 2011) saw P2454 from moisture inside sensor G505, and Chrysler lists it on the 2.8 diesel Town and Country with a sensor and connector check. Without the signal the filter load is estimated and regeneration may be limited.
- What you may notice
- Malfunction indicator lamp on
- DPF warning or regeneration inhibited
- Likely causes
- LikelySignal wire open or shorted to ground, connector unplugged
- PossibleInternal sensor failure, for example from moisture
- Rare5 V reference shorted by another sensor on the same supply
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.