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P2455 OBD-II Trouble Code: Diesel Particulate Filter Differential Pressure Sensor Short to Voltage

Check Engine Light

P2455 code definition

Diesel Particulate Filter Differential Pressure Sensor Short to Voltage

What the P2455 code means

P2455 is an OBD-II generic code that the engine control module (ECM) has detected the diesel particulate filter differential pressure sensor (DPFPS) signal to the ECM is shorted to voltage.

What causes the P2455 code?

  • The ECM monitors the particulate filter differential pressure sensor signal for high voltage signals, and if the voltage goes above 4.90 volts for more than 15 seconds, it sets the code P2455 and turns on the Check Engine Light.

  • The wiring or connection to the DPFPS is shorted.

What are the symptoms of the P2455 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory

  • The particulate filter may not go through a cleaning cycle and a clogged exhaust may happen

  • Loss of engine power if the filter gets clogged

How does a mechanic diagnose the P2455 code?

  • Scans codes and documents the code in the ECM. Views the freeze frame data to see when the fault happened

  • Checks the DPFPS for damaged wiring or sensor connections and damage to the sensor

  • Checks the sensor for the proper resistance to specifications

Common mistakes when diagnosing the P2455 code?

  • Failing to verify the concern before attempting any repairs

  • Failing to identify the shorted harness from loose harness straps

  • Failing to check for any technical service bulletins that may have a fix for the code

How serious is the P2455 code?

  • Code P2455 causes the Check Engine Light to go on, and this alone will cause a failed emission test.

  • The code means that the DPFPS is shorted and cannot detect when the particulate filter needs to be cleaned and regenerated. This can lead to blocked exhaust system particulate filters.

What repairs can fix the P2455 code?

  • Replacing a shorted DPFPS and run a regeneration to clean the particulate filter
  • Repairing the harness or connections to the DPFPS and run the particulate filter cleaning

Additional comments for consideration regarding the P2455 code

Code P2455 is a common code for diesel vehicles with a particulate filter that requires regeneration and uses a DPFPS. This sensor is needed to know when the filter is getting clogged and needs to have the regeneration run.

Need help with a P2455 code?

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