Code Definition

P2455 — Diesel Particulate Filter Differential Pressure Sensor Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2455

P2455 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2455 is stored, the module has detected a signal or supply voltage higher than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2455 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Engine Control Module (ECM) monitors the diesel particulate filter (DPF) differential pressure sensor to assess exhaust backpressure across the filter, using the reading to estimate soot loading and decide when to initiate active regeneration. The differential pressure sensor measures the pressure difference between the upstream and downstream sides of the DPF via two pressure hoses connected to fittings welded into the exhaust either side of the filter, and converts that difference into an analog voltage proportional to soot accumulation. DTC P2455 is set when the ECM detects a signal vol...

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