P2455 code meaning
Diesel Particulate Filter Pressure Sensor A Circuit High
Powertrain system Generic code P24xx codes Check engine light
What P2455 means
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.
P2455 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2455
- Malfunction indicator lamp on
- DPF warning or regeneration inhibited
Common causes of P2455
- Most likelySignal wire shorted to 5 V reference or battery voltage
- PossibleSensor low-reference (ground) circuit open
- PossibleInternal sensor failure
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
DPF differential pressure sensorDPF pressure sensor wiringECM
What each part of P2455 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 55 | The exact fault in that area. |
What to do next
- Note P2455 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2455
What does P2455 mean?
P2455 means "Diesel Particulate Filter Pressure Sensor A Circuit High". P2455 means the particulate filter pressure sensor signal sits above the highest plausible value, at the top of the 5 V range. It is a generic code, so it means the same on every make.
Is it safe to drive with P2455?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2455 fail an emissions test?
Yes, it can. P2455 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2455 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2455 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.