P0251 Fault Code

P0251 OBD-II Trouble Code Short Description

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

What does trouble code P0251 mean?

The P0251 fault code indicates that there is a malfunction in the injection pump fuel metering control system, specifically in control module A. This can be caused by issues with the camshaft, rotor, or fuel injectors, such as wear and tear, damage, or faulty components.

The solution for this error is to replace or repair any damaged or faulty components in the fuel system. It is recommended to have a professional mechanic diagnose and repair the issue as it involves the intricate fuel injection system and requires knowledge and expertise to properly diagnose and fix.

Ignoring the P0251 code can cause engine performance issues, reduced fuel efficiency, and potential damage to the fuel system components over time. Therefore, it is important to address the issue promptly to prevent further damage and ensure the safe and efficient operation of the vehicle.


What are the symptoms of the P0251 code?

Symptoms of P0251 fault code on cars may include:

  • Engine misfires
  • Rough idling
  • Decreased fuel efficiency
  • Lack of power while accelerating
  • Smoke coming from the engine
  • Illuminated check engine light
  • Difficulty starting the engine

It is essential to have the vehicle diagnosed and repaired by a qualified technician to prevent further damage to the engine.


What causes the P0251 code?

There are several possible causes for the P0251 fault code:

  1. Failed fuel injection pump
  2. Malfunctioning fuel injector driver module
  3. Damaged fuel injector wiring harness
  4. Clogged fuel filter
  5. Failing fuel pressure regulator
  6. Faulty fuel pressure sensor

It is important to diagnose and fix the underlying issue to prevent further damage to the engine and ensure proper fuel delivery. It is recommended to have a professional mechanic diagnose and repair the issue.

Possible Solutions

How to fix P0251?

  1. Check the fuel injection system: The first step in fixing this fault code is to check the fuel injection system. Inspect the fuel lines, fuel filters, fuel pump, and fuel injectors. If any of these components are faulty, replace them.

  2. Check the wiring: Inspect the wiring harness that connects the fuel injection system to the engine control module (ECM). Check for any damaged or loose wires, and repair or replace as necessary.

  3. Check the fuel pressure: Check the fuel pressure using a fuel pressure gauge. If the pressure is not within the manufacturer's recommended range, then there might be a problem with the fuel pressure regulator.

  4. Check the injection pump: The injection pump might be faulty if all the other components are functioning fine. Inspect the injection pump and replace it if necessary.

  5. Reset the fault code: After fixing the issue, reset the fault code. You can do this by either using an OBD-II scanner or disconnecting the battery for a few minutes.

If none of the above steps resolves the P0251 fault code, it's recommended to take the vehicle to a professional mechanic for further diagnosis and repair.