What is OBD-II Code P2455 – Particulate Filter Pressure Sensor A Circuit High

What is OBD-II Code P2455 – Particulate Filter Pressure Sensor A Circuit High?

When your check engine light illuminates, it can be an unwelcome surprise. If you’ve plugged in an OBD-II scanner and received the P2455 code – particulate filter pressure sensor A circuit high – it’s important to understand what it means and how to fix it. This code indicates a malfunction in the diesel particulate filter (DPF) system that could lead to severe engine damage if not addressed.

Understanding the DPF System and Its Role in Emissions Control

The diesel particulate filter is an essential component in a vehicle’s emissions control system. As its name suggests, it removes particulate matter – tiny combustible particles – from the engine exhaust before it is released into the atmosphere. Particulate matter is one of the primary pollutants from diesel exhaust and can have serious health and environmental impacts.

To remove particulate matter from the exhaust, the DPF captures it in a honeycomb-shaped ceramic material. Over time, this material becomes increasingly clogged with particulate matter and must be cleaned or replaced to maintain proper engine performance. But before we explore why the P2455 code occurs, it’s best to cover the basics of the DPF system.

The DPF system has two main components- P2455 Code.

1. Diesel Particulate Filter (DPF) – The filter captures soot particles to work appropriately, for it to be cleaned, heat is used. Heat will burn the propane inside the DPF to clear out any clogged remnants. Once the regeneration process is complete, you are good to go.

2. Particulate Pressure Sensor – Connected in the DPF, particulate matter (PM) pressure sensor is responsible for sensing and informing the engine control module (ECM) about the condition of the filter. If pressure builds up inside the filter, the sensor sends out a signal to the ECM to initiate regeneration.

The P2455 code occurs when excessive pressure is detected in the DPF system, typically caused by a malfunction in the particulate pressure sensor. The ECM may interpret this as an unusually high pressure situation, which can lead the sensor to report erroneously high pressure levels.

Symptoms of P2455 DTC Error Code

Most often, the only visible symptoms of the P2455 error code will be:

1. Check Engine Light On

2. Repetitive Clean DPF Prompts

If left unchecked, the DPF may clog, leading to engine damage and a decrease in performance.

Diagnosing P2455 Trouble Code

When you receive the P2455 code, you’ll need to diagnose the issue to identify the root cause. Here’s what to do:

1. Read the code – Use an OBD-II scan tool to read the code and any associated codes that may have also triggered.

2. Check the wiring – Examine the wiring connected to the particulate pressure sensor (PPS), checking for damage or loose connections.

3. Check the sensor – Test the PPS for proper function by checking the voltage readings across the circuit. If the readings are out of range, you may need to replace the sensor.

4. Look for leaks – Inspect the DPF system for any leaks or other damage that could lead to the erroneous pressure readings.

If the pressure sensor is faulty, it’s best to replace it.

Fixing P2455 Error Code

Once you’ve diagnosed the issue, you can begin repairing the problem. Here are the top methods:

1. Regeneration – Regeneration is the best solution to clear out clogged debris from the filter. It’s recommended to drive at highway speeds for at least 20-30 minutes once every month.

2. Replacing the Pressure Sensor – The Particulate Pressure Sensor is a crucial component required to sense and regulate the pressure in the DPF. Replacing the sensor can resolve the issue.

3. Check the wiring – If the wiring to the PPS is worn, open or shorted, this can interfere with the DPF maintenance system’s functioning. Check the wiring and fix any damage.

4. Clean or Replace DPF – Replace or clean the filters if required.


The P2455 code requires immediate attention, as ignoring it could lead to serious engine damage. With proper diagnosis and repair procedures, however, you can resolve the issue and restore your engine to proper function. Keep in mind that regular maintenance is essential to prevent DPF issues from arising, so don’t neglect your vehicle’s DPF system. By staying aware and taking proper care of your vehicle, you can keep both your car and the environment healthy.


1. What does the P2455 error code mean?

P2455 is a diagnostic trouble code (DTC) that indicates that there is excessive pressure in the particulate filter pressure sensor system, commonly associated when the filter is clogged or faulty.

2. What are the possible symptoms of the P2455 error code?

Symptoms of the P2455 code include the check engine light coming on and repetitive clean DPF prompts.

3. How can I diagnose a P2455 error code?

To diagnose a P2455 error code, you’ll need to read the code with an OBD-II scanner and check the wiring to the particulate pressure sensor.

4. How do I fix a P2455 error code?

Regeneration is the best solution to clear out clogged debris from the filter. You can also replace the particulate pressure sensor, check the wiring or replace the DPF.

5. What can cause a P2455 error code?

A malfunctioning or clogged DPF, faulty particulate pressure sensor, open or shorted wires, and leaks in the DPF can cause a P2455 error code.

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