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Diesel particulate filter (DPF)

P2455 DPF pressure sensor: signal or voltage too high ("A")

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P2455 means: DPF pressure sensor: signal or voltage too high ("A"). The diesel particulate filter (DPF) traps soot and burns it off from time to time. Drive gently and have the car checked soon. The repair usually costs about €60–300 in Estonia. The most common cause: connector loose, damp or corroded.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.
Typical repair cost€60–300parts and labour in Estonia

What it means

The diesel particulate filter (DPF) traps soot and burns it off from time to time. The filter is blocked, regeneration fails, or the filter sensor reading is wrong. The signal voltage is too high. Usually a wire is shorted to power, the ground is broken or the part itself has failed.

What you may notice

  • DPF or engine light on
  • Less power or limp mode
  • Higher fuel consumption
  • Fan running after switch-off

What could be wrong

  1. 1Connector loose, damp or corroded
  2. 2Wire shorted to power or ground broken
  3. 3Faulty pressure sensor
  4. 4Engine computer fault (rare)

Repair difficulty: Moderate

What you can check yourself

First look at the connector and wiring: anything loose, melted or green with corrosion? If the DPF light is on, drive steadily on the open road for 20–30 minutes so regeneration can finish. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

  1. We read the fault data on the diagnostic tool and check whether the fault is constant
  2. We measure the circuit's supply, ground and signal
  3. We repair the wire or replace the connector
  4. If the wiring is fine, we replace the pressure sensor

Standard SAE description: Diesel Particulate Filter Pressure Sensor "A" Circuit High

This code usually comes with: Diesel particulate filter (DPF) lightSee what the light means →

Related symptoms: Loss of power or limp mode

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

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Questions

What does fault code P2455 mean?

DPF pressure sensor: signal or voltage too high ("A"). The diesel particulate filter (DPF) traps soot and burns it off from time to time. The filter is blocked, regeneration fails, or the filter sensor reading is wrong. The signal voltage is too high. Usually a wire is shorted to power, the ground is broken or the part itself has failed.

Can I drive with code P2455?

Drive gently and have the car checked soon.

How much does it cost to fix P2455?

Roughly €60–300 in Estonia. The price depends on exactly what has failed and on the car.

How is P2455 fixed?

We read the fault data on the diagnostic tool and check whether the fault is constant. We measure the circuit's supply, ground and signal. We repair the wire or replace the connector. If the wiring is fine, we replace the pressure sensor.

Related codes

P2454DPF pressure sensor: signal or voltage too low ("A")P2456DPF pressure sensor: signal drops out at times ("A")P2457EGR cooler: reading or operation not rightP2567Catalyst temperature sensor: circuit faultP2568Catalyst temperature sensor: reading or operation not rightP2569Catalyst temperature sensor: signal or voltage too lowP0402Too much gas flowing through the EGR valveP0033Turbo bypass valve: circuit fault

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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