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P0255 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


It’s important to understand the diagnostic trouble codes, or DTCs when diagnosing and repairing vehicle problems. For many car owners, one such code, P0255, can be a cause for concern. We’re going to explore the what, why, symptoms, diagnosis, common mistakes, and possible fixes for the P0255 DTC code. You will be better acquainted with what that code means and how to deal with it by the end of this article.


P0255 is a standardized OBD-II (On-Board Diagnostics II) trouble code that specifically relates to the injection pump fuel metering control “A” intermittent (cam/rotor/injector) signal. In simpler terms, it suggests that there’s an issue with the control signal for the fuel injection system. The “A” in the code may vary depending on the vehicle’s make and model, but the core meaning remains the same.


To effectively troubleshoot a P0255 DTC code, it is crucial to comprehend the possible reasons. Typical reasons include:

  • Faulty Fuel Injection Pump: This code might be caused by a defective fuel injection pump that interferes with the signal that regulates fuel metering.
  • Poor signal transmission may be caused by damaged or corroded wires, connections, or harnesses.
  • Crankshaftcrankshaft or camshaft position sensors malfunctioning: These sensors are essential for producing the signal. The code may run if either component fails.
  • Fuel Delivery Issues: Problems with fuel pressure or quality may affect the fuel injection system and result in the appearance of the code.


Knowing the symptoms of a P0255 code will help you locate the problem quickly. Typical signs include:

  • Reduced Engine Performance: Your car’s power may be diminished, and it could accelerate slowly.
  • Engine Stalling: The engine may stall or have difficulty keeping a steady idle.
  • Increased Fuel Use: An inefficient fuel supply might result in an increase in fuel use.
  • The most visible symptom is an illuminated check engine light, which is located on your dashboard.


To determine the precise reason for the P0255 code, a proper diagnostic is necessary. A knowledgeable technician will employ sophisticated diagnostic equipment to:

  • To get the code: To begin, they will gather pertinent information and recover the code using an OBD-II scanner.
  • Examine the connectors and wiring: Any obvious damage or corrosion in the wire and connections can be seen by doing a visual check.
  • Fuel Injection Pump Test: It is critical to test the circuitry and the fuel injection pump’s operation.
  • Check the sensors on the crankshaft and camshaft: Checking that these sensors are functioning properly is necessary.
  • Check the Fuel Pressure: Make sure the fuel pressure complies with the manufacturer’s requirements.

Common mistakes

Avoiding common mistakes during the diagnostic and repair process is essential:

  • Neglecting Wiring Inspection: Sometimes, the issue lies in damaged wiring or connectors, which can be overlooked.
  • Replacing Parts Prematurely: Jumping to conclusions and replacing parts without proper diagnosis can be costly and ineffective.

How serious is this?

The seriousness of the P0255 code depends, in particular, on its underlying causes and how they’re dealt with. Failure to deal with this issue may lead to reduced power, decreased fuel efficiency, and even more serious engine problems in the future. If we are to avoid more damage, the code needs to be addressed as soon as possible.

What repairs can fix the codeS?

repair manuals

The appropriate repair will vary depending on the root cause, but potential solutions may include:

  • Replacing the Fuel Injection Pump
  • Repairing or Replacing Wiring and Connectors
  • Replacing Camshaft or Crankshaft Position Sensors
  • Addressing Fuel Delivery Issues

It’s crucial to consult with a qualified mechanic to determine the most suitable course of action.

Related codes

In some cases, you may encounter related codes alongside P0255. These codes can provide additional insight into the issue. Common related codes include P0256 (Injection Pump Fuel Metering Control “B” Circuit) and P0257 (Injection Pump Fuel Metering Control “B” Range/Performance).


Finally, an issue with the fuel injection control signal is detected in the P0255 DTC code. While this might result in performance or effectiveness problems, it is necessary to address them quickly and effectively with proper diagnosis and correction.

Don’t forget that if we don’t pay attention to the code, it can lead to more serious problems down the road. Contact a professional mechanic to ensure that your vehicle is in good health and durable if you have encountered the P0255 code.

P0255 Code – What Does It Mean & How To Fix It