What does P2455 mean?
The DPF differential pressure sensor measures the pressure drop across the diesel particulate filter. The computer uses it to estimate how much soot is in the filter and when to regenerate.
The signal is reading higher than the sensor can normally produce, which points at a wiring fault or a dead sensor.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Regens too often or not at all
- Possible reduced power
Common causes
- Open sensor ground wire
- Signal wire shorted to the 5 V reference or to battery voltage
- Water in the connector
- Failed sensor
How to diagnose P2455
- Check the sensor ground first: an open ground drives the signal high.
- Unplug the sensor: if the signal still reads high, look for a short to voltage in the harness.
- If the wiring is good, replace the sensor.
- Key on, engine off, the reading should be near zero.
- Inspect both hoses for cracks, melting and correct routing (they can be swapped by mistake).
How to fix it
- Replace hoses
- Clean tubes
- Replace the sensor
- Repair wiring
Estimated repair cost
Likely repairs for P2455 run from about $150 to $500, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| DPF differential pressure sensor | $150 - $500 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P2455?
Moderate severity
Drivable, but a false soot reading can lead to excessive regens or a clogged filter.
P2455 FAQ
What does P2455 mean?
P2455 stands for "Diesel Particulate Filter Pressure Sensor "A" Circuit High". The DPF differential pressure sensor measures the pressure drop across the diesel particulate filter.
Can I drive with a P2455 code?
Drivable, but a false soot reading can lead to excessive regens or a clogged filter.
How much does it cost to fix P2455?
It depends on the cause. The likely repairs for P2455 range from about $150 to $500 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P2455?
The most common causes are: open sensor ground wire; signal wire shorted to the 5 V reference or to battery voltage; water in the connector.