P0256 Fault Code

P0256 OBD-II Trouble Code Short Description

Injection Pump Fuel Metering Control B Malfunction (Cam/Rotor/Injector)

What does trouble code P0256 mean?

The P0256 code indicates a malfunction in the fuel metering control system of the injection pump. This could be due to issues with the cam, rotor, or injector. The injection pump is responsible for delivering fuel to the engine's cylinders, and any malfunction in its control system can result in poor engine performance, reduced fuel efficiency, and potential engine damage.

To resolve this issue, a thorough diagnosis is necessary to identify the root cause of the malfunction. The diagnosis may involve checking the fuel injectors, the injection pump's electrical connections, and the cam and rotor for any signs of damage or wear. Once the problem has been identified, appropriate repairs can be made, such as repairing or replacing the faulty components.

Ignoring the P0256 code can result in further damage to the engine over time and may lead to costly repairs. Therefore, it is important to address the issue as soon as possible to prevent any additional damage and restore the vehicle's performance.


What are the symptoms of the P0256 code?

The P0256 fault code is related to fuel injection pump malfunctions. Some symptoms of this code on cars may include:

  • Check Engine Light (CEL) will illuminate
  • Reduced engine power and performance
  • Engine misfires and runs rough or stalls
  • Difficulty starting or no start condition
  • Decreased fuel efficiency
  • Smoke from the exhaust system

If you experience any of these symptoms, it is recommended to get your vehicle diagnosed and repaired by a qualified mechanic as soon as possible to prevent further damage and costly repairs.


What causes the P0256 code?

Possible causes of P0256 fault code on cars include:

  • Malfunctioning fuel injection pump
  • Faulty fuel pressure sensor
  • Defective fuel injectors
  • Blown fuse related to the injection system
  • Damaged or worn out camshaft sensor
  • A problem with the engine control module (ECM)
  • Issues with wiring or electrical connections related to the injection system.

Possible Solutions

How to fix P0256?

The P0256 fault code refers to an issue with the fuel metering control B on the injection pump, which could be caused by a problem with the cam, rotor or injector. Here are some steps to fix the P0256 fault code on cars:

  1. Check the wiring and connections - Make sure the wiring and connectors are clean, tight and free from corrosion or damage.

  2. Check the fuel supply - Check the fuel supply to ensure that there is enough fuel pressure and clean fuel available.

  3. Replace the injection pump - If the above steps do not resolve the fault code, you may need to replace the injection pump.

  4. Check and replace the cam, rotor or injector - If the problem persists after replacing the injection pump, check and replace the cam, rotor or injector as necessary.

  5. Clear the fault code - After fixing the issue, clear the fault code and run a test drive to ensure that the problem has been resolved.

It is important to note that fixing the P0256 fault code may require specialized knowledge and tools. If you are not confident in your abilities to fix the issue, it is recommended to seek the assistance of a professional mechanic.