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Engine-Codes – Generic – P0259

P0259 Code - Injection Pump Fuel Metering Control 'B' Low

Quick Answer

The diagnostic trouble code P0259 indicates an issue with the Injection Pump Fuel Metering Control 'B' being too low. Common causes include Clogged fuel filter, Faulty fuel pump, Issues with the fuel pressure regulator. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0259 indicates Injection Pump Fuel Metering Control 'B' Low.
Common causes
Common causes include Clogged fuel filter, Faulty fuel pump, Issues with the fuel pressure regulator.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0259 Description

The diagnostic trouble code P0259 indicates an issue with the Injection Pump Fuel Metering Control 'B' being too low. This code is typically found in diesel engines and is related to the fuel injection system. The injection pump is responsible for delivering the precise amount of fuel to the engine cylinders at the correct time for combustion. When the fuel metering control is low, it means that the pump is not delivering enough fuel to meet the engine's demands, leading to potential performance issues.

OBDII Code P0259 - Injection Pump Fuel Metering Control 'B' Low
P0259 Code - Injection Pump Fuel Metering Control 'B' Low

Common Causes of P0259

  1. Clogged fuel filter
  2. Faulty fuel pump
  3. Issues with the fuel pressure regulator
  4. Wiring or electrical connection problems
  5. Malfunctioning fuel injectors

Symptoms of P0259

  1. Reduced engine power
  2. Engine misfires
  3. Poor acceleration
  4. Rough idling
  5. Decreased fuel efficiency

How to Fix P0259

  1. Diagnose the exact cause of the low fuel metering control by performing a fuel system inspection and testing fuel pressure.
  2. Replace the fuel filter if it is clogged or dirty.
  3. Test the fuel pump and replace it if it is not delivering the correct fuel pressure.
  4. Check the fuel pressure regulator for proper operation and replace if necessary.
  5. Inspect wiring and connections for any damage or corrosion, repairing or replacing as needed.

Cost to Fix P0259

The cost of repairing the Injection Pump Fuel Metering Control 'B' low code can vary depending on the specific cause of the issue and the make and model of the vehicle. On average, the repair costs can range from $200 to $800, including parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to obtain quotes from multiple sources to get an accurate estimate.

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Code P0259 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0259 Code

1. What does the OBDII code P0259 mean?

P0259 indicates an issue with the Injection Pump Fuel Metering Control 'B' circuit, specifically a low signal detected by the engine control module (ECM).

2. What are the common symptoms of a P0259 code?

Symptoms may include reduced engine power, poor fuel efficiency, rough idling, difficulty starting the engine, or the engine stalling.

3. What causes the P0259 code to appear?

Common causes include a faulty injection pump, damaged or corroded wiring or connectors in the fuel metering control circuit, a clogged fuel filter, or a malfunctioning fuel pressure sensor.

4. Can I drive my vehicle with a P0259 code?

Driving with a P0259 code is not recommended as it can lead to poor engine performance, potential stalling, and increased wear on fuel system components.

5. How is a P0259 code diagnosed?

A technician will typically inspect the fuel system, check the wiring and connectors for damage, test the fuel pressure sensor, and use a scan tool to monitor live data.

6. What repairs can fix the P0259 code?

Repairs may involve replacing the injection pump, repairing or replacing damaged wiring or connectors, cleaning or replacing the fuel filter, or replacing a faulty fuel pressure sensor.

7. Can a dirty fuel filter cause a P0259 code?

Yes, a clogged or dirty fuel filter can restrict fuel flow, causing the ECM to detect low fuel metering control and trigger the P0259 code.

8. How much does it typically cost to fix a P0259 code?

Repair costs can vary widely depending on the root cause, ranging from $100 for a fuel filter replacement to over $1,000 for injection pump replacement.

9. What tools are needed to troubleshoot the P0259 code?

Tools typically include an OBDII scanner, a multimeter for testing electrical connections, and possibly a fuel pressure gauge to check the fuel system.

10. Can a weak fuel pump trigger the P0259 code?

Yes, a weak or failing fuel pump can result in insufficient fuel pressure, which may cause the P0259 code to appear.

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