The P2455: Diesel Particulate Filter Pressure Sensor ‘A’ Circuit High code indicates that the voltage in the pressure sensor ‘A’ circuit for the diesel particulate filter (DPF) is higher than expected. This can be due to a faulty sensor, wiring problems, or issues with the connectors, potentially leading to incorrect pressure readings and affecting the DPF’s ability to regenerate effectively.
P2455 – Quick Overview
Code | Information |
---|---|
Meaning | P2455: Diesel Particulate Filter Pressure Sensor ‘A’ Circuit High |
Is it serious? | Moderate – high voltage can lead to incorrect pressure readings, preventing proper DPF regeneration, which may lead to increased emissions and potential filter damage. |
Possible causes | – High voltage in the pressure sensor ‘A’ circuit – Faulty sensor – Wiring or connector issues |
How to diagnose? | – Measure voltage in the pressure sensor ‘A’ circuit – Inspect and test the sensor and wiring – Replace faulty sensor if needed |
P2455 Meaning
The P2455: Diesel Particulate Filter Pressure Sensor ‘A’ Circuit High code means that the voltage from the pressure sensor ‘A’ circuit in the DPF system is above the acceptable threshold. This can indicate an electrical fault such as a short circuit or a sensor that is not functioning correctly. If the DPF pressure sensor provides inaccurate readings, it can prevent the diesel particulate filter from regenerating effectively, leading to excessive soot build-up and reduced vehicle performance.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to determine if there are any other related codes. These may provide additional insight into other parts of the DPF or exhaust system. | OBD-II Scanner |
Inspect the Pressure Sensor | Visually inspect the DPF pressure sensor ‘A’ for any visible damage, such as cracking, corrosion, or physical wear that could impact functionality. | Flashlight, Safety Gloves |
Measure Voltage in the Circuit | Use a multimeter to measure the voltage in the pressure sensor ‘A’ circuit. Compare these readings with the manufacturer’s specifications to determine if they are above the expected range. | Multimeter |
Test the Sensor Output | Use a diagnostic tool to test the output voltage of the sensor under different pressure conditions. Verify if the output is consistently higher than it should be, indicating a faulty sensor. | Diagnostic Tool, Multimeter |
Inspect Wiring and Connectors | Check the wiring and connectors leading to the sensor for any signs of damage, loose connections, shorts, or corrosion that might cause high voltage. | Flashlight, Multimeter |
Repair or Replace Damaged Wiring | If the wiring or connectors are damaged, repair or replace them as necessary to ensure the circuit is functioning correctly and voltage is within acceptable limits. | Wiring Repair Kit, Connector Tools |
Replace the Sensor if Faulty | If the sensor is found to be defective and consistently produces high voltage readings, replace it to restore proper functionality to the DPF system. | Replacement Sensor, Wrench Set |
Clear the Code and Test Drive | After completing repairs, clear the P2455 code using an OBD-II scanner. Take the vehicle for a test drive while monitoring the sensor readings to verify that they are within the correct range. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle after the test drive to ensure that the P2455 code has not returned. If the code persists, further diagnostics are necessary to find any unresolved issues. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)