P2455 Fault Code

Diesel Particulate Filter Differential Pressure Sensor Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2455 code indicates that the diesel particulate filter (DPF) differential pressure sensor circuit is experiencing a high voltage condition. This sensor plays a critical role in monitoring the pressure difference between the inlet and outlet of the DPF, which helps the engine control module (ECM) determine when to initiate a regeneration cycle. When the reading from this sensor is higher than expected, it can trigger this fault code, signaling potential issues within the DPF system.

What are the symptoms of the P2455 code?

Common symptoms of a P2455 code may include:

• Check Engine Light illuminated on the dashboard.
• Poor engine performance, including decreased power and acceleration.
• Increased exhaust smoke due to improper DPF function.
• Difficulty in the vehicle passing emissions tests.

What causes the P2455 code?

The high voltage readings can stem from various issues, including:

• A faulty DPF differential pressure sensor.
• Damaged wiring or connectors in the sensor circuit.
• Blockages in the DPF or exhaust system affecting pressure readings.
• A malfunctioning ECM that misinterprets the sensor data.

How to fix P2455?

To resolve the P2455 code, it is recommended to:

• Inspect the DPF differential pressure sensor and its wiring for any visible damage.
• Test the sensor for proper operation and replace it if necessary.
• Check for any blockages in the DPF or exhaust system and address them as needed.
• Clear the fault code and perform a test drive to see if the issue recurs.