P0259 - OBD Trouble Code

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Is your vehicle’s Check Engine Light illuminated? Are you experiencing sudden decrease in engine power and acceleration? Is there a drop in the fuel economy with increased level of emissions? All these indicate problem with the fuel delivery system and the Powertrain Control Module, thus flashing OBD Code P0259 error.

The code P0259 Injection Pump Fuel Metering Control B High (Cam/Rotor/Injector) is set when the voltage at the sensor stays above a set level (usually over 4.8V) for too long a period. This code is usually considered to be an electrical circuit issue. Refer to a vehicle specific repair manual to determine the problematic area and solve the problem.

Whenever the PCM finds discrepancy in the voltage signal, it will set this error code and thus needs immediate diagnostic as it will lead to direct impact on the fuel delivery as well as the engine performance output.

What causes the problem of Injection Pump Fuel Metering Control B High (Cam/Rotor/Injector)?

• Leaky/damaged in the fuel injector
• Poor fuel pump
• Leakage in the engine vacuum
• Some fault in the oxygen sensor
• Mass air flow or manifold air pressure sensor failure
• Poor electrical connections
• PCM failure

1. Diagnostic Tools - You will need high grade diagnostic tools for correction of the OBD error code which is detected. Buy now to grab amazing deals.
2. Powertrain Control Module - PCM faults can store and display wrong OBD Code which can result in wrong diagnosis. Thus, replace the damaged components now.
3. Fuel Pressure Sensor - Check for faulty FPS and replace it now!
4. Fuel Filter - Check and replace faulty fuel filter to avoid any hindrance to the fuel delivery and thus the engine performance.
5. Fuel Control Actuator - If the actuator is faulty, the fuel will not be correctly delivered to the injector and thus will result in delivery problems. Thus, replace it now!
6. Fuel Pump - If the fuel pump is leaky or damaged, resolve the issue immediately. But new pump now!
7. Fuel Pressure Regulator - It is important for the regulator to work properly to keep the check on the fuel demands by the engine. Thus, replace faulty parts now!
8. Fuel Pressure Gauge - Check if the pressure gauge is working perfectly. If not, replace it first.

Symptoms of a P0259 trouble code may include:

Common Symptoms

• Low engine power and limited output
• Abnormal throttle response and hard cold starting
• Declined fuel economy
• Sluggish Engine and lot of noise
• Faulty ECM/PCM
• Engine Rich or lean condition
• Engine misfires and loss of throttle response
• Engine smoking on start-up with increased emissions

Some of the parts that are directly affected and can be immediately replaced are as follows;

• Fuel Filter
• Fuel Injector
• Fuel Replay
• Wiring and Connectors
• PCM/ECM
• Fuel Pump

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Diesel engines, like gasoline engines, are controlled using a PCM. In most instances, your vehicle’s PCM provides the fuel control actuator with a voltage signal just before fuel is injected into your cylinders. A sensor in the fuel rail, fuel injection pump, or fuel pressure regulator inputs a voltage signal back to the PCM, and the PCM then uses this input signal to monitor pulse width, volume, and fuel pressure. This is why a scanner, digital volt/ohmmeter, and a fuel pressure gauge will help you to diagnose the potential causes for this code.

Always begin your diagnosis with a careful visual inspection of your system’s components, electrical connectors, and circuitry. Repair or replace any items that appear to be damaged, disconnected, or contaminated. Next—and this is very important—connect your scanner to your vehicle and record all freeze frame data and stored codes.

Check for any open, short, corroded or damaged wirings and connections in association with the sensor and the circuit and repair or replace the faulty wirings immediately.

If the Check Engine Light comes on, visually inspect the fuel tank, fuel lines, and fuel filter for any faults and damaged that can be repaired or replaced completely.

Take the manual fuel pressure readings at the fuel rail and compare it to manufacturer’s specifications. Use a scan tool to compare manual readings to what the ECM sees.

Lastly, the fuel pump is tested and replaced if found faulty. Examine the fuel injector properly for any damages or leaks and replace or repair as necessary. Use the noid light for pulse check and do a sound test to check the proper functioning of the injector.

Check for PCM (Powertrain Control Module) faults. Although rare in nature, these faults can cause wrong error being stored in the PCM and also hampers the vehicle’s performance by affecting the exhaust system, intake system, fuel delivery system, etc.

Common Mistakes When Diagnosing The P0259 Code

Most of the time we tend to diagnose the problem without completely identifying the real cause of it. It is important to follow all the diagnostic steps and examine each component carefully before correcting. Some of the components to be focused on are listed below;

• Clogged fuel filter
• Fuel pressure regulator failure
• Fuel pump failure
• Leaking fuel lines
• Powertrain Control Module (PCM) failure
• Wiring/harness issue