P0255 - OBD Trouble Code

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Are your vehicle engine performance decreasing and you notice an increase in the fuel consumption? Do you notice the Malfunction Indicator Light illuminated on the dashboard? If there are faults in the fuel delivery system of the car, especially the fuel injector, then P0255 fault code is definitely going to trigger up.

OBD error code P0255 is a generic code that is defined as – “Injection pump A, rotor/cam -circuit intermittent”. This code is set when the PCM (Powertrain Control Module) detects an intermittent loss of continuity in the signal/feedback circuits between itself, the fuel metering control sensor, the fuel quantity actuator, and other sensors involved in determining the fuel pressure and volume. Note that this code applies exclusively to diesel-powered applications.

The PCM uses the pressure sensor which converts fuel pressure into a signal voltage, to calculate injector pulse width (measured in milliseconds) and injection timing to ensure that the correct amount of fuel is injected into the cylinders under all operating conditions. Thus, the signal voltages of the electronic fuel control actuator and the fuel metering control sensor must be in agreement for the PCM to be able to calculate an appropriate fuel delivery strategy to ensure efficient engine operation under all engine speeds and loads.

What causes the problem of Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector)?

• Clogged/dirty fuel filter
• Defective fuel pump
• Shorted or open circuits
• Shorted or open electrical connectors
• Faulty Powertrain Control Module that needs reprogramming

1. Powertrain Control Module - P0255 code can also display due to some defects in the PCM. So, it is very important to replace the powertrain control module components to get the correct readings. Buy new components form us now!
2. Diagnostic Tool - Choose from our wide variety of diagnostic tools to detect and correct the OBD code error.
3. Fuel Filter - Repair or replace clogged or damaged fuel filters to ensure proper and timely fuel delivery to the engine. Buy form us now!
4. Fuel Pressure Sensor - If the fuel pressure sensor is faulty, it must be immediately replaced to ensure correct air to fuel ratios. Buy new sensors now!
5. Fuel Control Actuator - If the fuel control actuator in problematic, replace it immediately and shop for new now!
6. Fuel Pump - If the fuel pump is damaged, the fuel will not enter the engine in right quantity and thus need immediate replacement. Buy new pump and replace now.

It is important to note the symptoms that can hint towards this kind of problem. Normally the below mentioned symptoms are the first to be noticed and suspect any problem. These can indicate towards definite fuel delivery system problem and thus the engine performance. Lean/rich exhaust conditions are the direct sigh of the air to fuel ratio mismatch with noting the reduced/increased volume of fuel entering the chamber. Thus, the owner must understand that the problem prevails with the delivery system only.

Common Symptoms

• Affected engine performance
• Affected fuel efficiency
• Engine stalling and reduced accelerations
• Issue of lean/rich exhaust codes
• Some misfire codes can also be stored
• Engine running on failsafe mode
• Check Engine Light On

The most common problem in this scenario is the fuel injection pump which needs replacement. However, it is important for other to be examined also and checked for any faults and damages. Major components that might need replacement are as follows:

• Check the vehicle with the OBD-II device
• Reset the code and test the vehicle to see if it comes back
• Check the electrical connections for corrosion and other issues
• Replace the fuel filter
• Replace the fuel pump
• Replace the fuel control actuator driver in the powertrain control module

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Contact an experienced mechanic who will visually inspecting the fuel system, searching primarily problem with the fuel injector circuit.

• You will require quality diagnostic tools and equipment to detect and resolve this issue. Make use of factory grade OBD scanner to scan for the existence of a particular OBD error code in the vehicle system. Always test drive the vehicle to see if the code in genuine and returning again or not.
• Freeze frame the data and clear code. Test run the vehicle to see if the code returns.
• Repair or replace the part that is causing the fuel injector circuit malfunction, once the source of the problem has been found.
• Check for any wiring and harness issues and correct the damaged, corroded or short wirings.
• If no problem is found, then check for the faulty ECU. Although, this fault is very rare but can be a reason for problematic fuel delivery system, thus hampering the engine performance. The ECU needs to be replaced in such condition and has to be reprogrammed to erase any stored faulty error.

Common Mistakes When Diagnosing The P0255 Code

• Mistakes can easily be made by anyone if they skip steps or do not complete all steps required.
• These steps should always be followed to avoid unnecessary repairs, and save time and money.