Powertrain, generic (extended)

P2454 Diesel Particulate Filter Pressure Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Signal wire open or shorted to ground, connector unplugged
Internal sensor failure, for example from moisture
5 V reference shorted by another sensor on the same supply

Symptoms

  • Malfunction indicator lamp on
  • DPF warning or regeneration inhibited

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–300
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dpf differential pressure sensordpf pressure sensor wiringecm

Related codes

P2452P2453P2455P0641

References: fordservicecontent.com, gsi.ext.gm.com, saabwisonline.com, static.nhtsa.gov.