Powertrain, generic (extended)

P2455 Diesel Particulate Filter Pressure Sensor A Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2455 means the particulate filter pressure sensor signal sits above the highest plausible value, at the top of the 5 V range. Ford's 2023 diesels and the Opel/GM 2.0 CDTi in the Saab 9-5 (2010) both use 4.9 V as the limit, Ford within 2 s and Saab after 1 s; on Ford's 6.7 L the signal follows roughly 0.082 V per kPa above 0.45 V, so 4.9 V would be about 54 kPa. Typical faults are a signal wire shorted to the 5 V reference or to battery voltage, or an open low-reference (ground) circuit, which Saab lists among the circuit faults for this code. A real pressure that high from a blocked filter is unusual and would normally first raise soot codes such as P2463. Chrysler lists P2455 on the 2.8 diesel Town and Country with a sensor and connector check. The ECM falls back to a modelled soot load and may limit regeneration.

Likely causes

Signal wire shorted to 5 V reference or battery voltage
Sensor low-reference (ground) circuit open
Internal sensor failure

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

P2452P2453P2454P2463

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