P2452Diesel Particulate Filter Pressure Sensor A Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The pressure sensor A of the particulate filter, usually a differential sensor with hoses to the filter inlet and outlet, tells the ECM how loaded the filter is. Despite its generic circuit title, P2452 is in practice an offset check made when no exhaust flows. Ford's 2023 diesels run it in after-run and set the code when the sensor still reads more than 1 kPa. GM's 2018 diesels check the filter inlet pressure at the start of the drive cycle, after at least 10 s engine off, and set it as a Type B code when the offset is too big. A sensor that has drifted, moisture inside it or a hose holding pressure all give such an offset. Audi saw P2452 together with P2453, P2454, P2456 and P2002 on the 2009 to 2011 Q7 TDI and traced it to moisture entering the differential pressure sensor G505 through poor internal sealing; the fix was a sensor with better sealing. The soot model then works with wrong values, so regeneration timing suffers.
- What you may notice
- Malfunction indicator lamp on
- Regeneration too early, too late or inhibited
- Likely causes
- LikelySensor offset drifted or moisture inside the sensor
- PossibleSensor hose blocked by soot or condensate
- RareCorroded connector or terminals
- 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: €60 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.