P0259 Fault Code

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

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0259 fault code is a diagnostic trouble code (DTC) that indicates a problem with the fuel injection pump. Specifically, it indicates that the fuel metering control B circuit is experiencing a high level of resistance.

This fault code is commonly found in diesel-powered vehicles, as these vehicles require a high level of precision in their fuel delivery systems. If left unaddressed, the P0259 code can lead to decreased fuel efficiency, reduced engine power, and other performance issues.

The most common causes of the P0259 code include a faulty fuel injection pump, a malfunctioning fuel pressure regulator, a clogged fuel filter, or wiring issues within the fuel injection system. To fix this issue, the fuel injection system must be thoroughly inspected and any faults repaired or replaced as needed.

In some cases, the vehicle may also require a software update to correct issues with the fuel injection system. It is important to address this issue promptly to avoid more serious engine problems in the future.

What are the symptoms of the P0259 code?

The symptoms of a P0259 fault code on cars include:

• Check Engine Light (CEL) is on
• Engine performance issues, such as rough idling or hesitation
• Decreased fuel efficiency
• Loss of power during acceleration
• Increased smoke emissions from the exhaust
• Difficulty starting the engine.

What causes the P0259 code?

The P0259 fault code indicates an issue with the fuel injection pump's fuel metering control. This could be caused by a variety of issues, including:

1. Malfunctioning fuel injection pump
2. Faulty fuel pump control module
3. Defective fuel pump driver module
4. Damaged fuel pressure regulator
5. Corroding fuel injector wiring harness
6. Failed fuel injector

To diagnose and fix the problem, it's best to take your vehicle to a certified mechanic or dealership for a thorough inspection. They will be able to pinpoint the exact issue and recommend the best course of action to repair it.

How to fix P0259?

To fix the P0259 fault code on cars, you can:

1. Check the fuel injection pump for any damage or malfunction.
2. Inspect the fuel injector and fuel injector wiring harness for any issues.
3. Check the engine control module (ECM) or fuel injection control module (FICM) for any malfunctions.
4. Verify the fuel system pressure using a fuel pressure gauge.
5. Check the wiring and connectors for any damage, corrosion, or loose connections.
6. Replace any damaged or malfunctioning components if necessary.