OBD code P2455

The DPF differential pressure sensor signal is too high, indicating possible high backpressure or an electrical fault.

Estimated severity

High

Common symptoms

Limp mode
Power loss
DPF warning light
Regeneration may be blocked
Very high differential pressure reading

Likely causes

DPF heavily restricted
Sensor signal shorted to voltage
Blocked pressure hose
Faulty differential pressure sensor
Exhaust restriction upstream or downstream of the DPF

Recommended checks

1. Check whether the pressure reading is high even with the engine off.
2. Inspect sensor wiring for short to voltage.
3. Check pressure hoses for blockage, melting or incorrect routing.
4. Measure real differential pressure if possible before forced regeneration.
5. Do not force regeneration if restriction is excessive.

What does code P2455 mean?

P2455 means the DPF pressure sensor signal is excessively high. It may reflect real high backpressure from a blocked filter, but it can also be caused by a short to voltage, blocked hose or faulty sensor. Because real high backpressure can damage the turbo, this code should be taken seriously.

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