Error Code P0260: What It Means & What To Do?

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OBD-II Code Decreased engine performance is defined as Injection Pump Fuel Metering Control "B" Intermittent. It indicates that PCM has detected a discrepancy in the signal voltage supplied to the electronic fuel control actuator and the signal returned from the fuel metering control sensor. This code could have been set because of mechanical or electrical issues and pertains exclusively to diesel powered vehicles.

P0260 is a diagnostic trouble code (DTC) for "Injection Pump Fuel Metering Control “B” Intermittent (Cam/Rotor/Injector)". The Injection Pump Metering Control Circuit "B" is usually found mounted inside / on the side of the injection pump bolted to the engine. The Fuel Rack Position sensor converts the amount of diesel fuel being delivered by the Fuel Quantity Actuator to the injectors into an electrical signal for the PCM. PCM receives this voltage signal to determine how much fuel it will put into the engine based upon engine operating conditions.

If the PCM input signals from the fuel metering control sensor does not coincide with the voltage reading of the fuel control actuator driver signal, this type of code will be stored and a malfunction indicator lamp may be illuminated.

What causes this problem Injection Pump Fuel Metering Control B Intermittent?

• Faulty fuel injection pump actuator
• Problem within wiring
• Frayed fuel injection pump
• Faulty fuel rack position sensor
• PCM failure

1. Fuel Injection Pump - A fuel injection pump is a very complex piece of engineering. Each one is calibrated to deliver just the right quantity of fuel via the fuel injector into the combustion chamber. This ensures the maximum power output and optimum fuel efficiency.
2. Fuel Injection Pump Actuator - Always replace the faulty fuel injection pump actuator to avoid storing associated trouble codes.
3. Fuel Rack Position Sensor - A faulty fuel rack position sensor could also be the cause of this trouble code. Make sure it should work properly else replace it. 
4. PCM - The Powertrain Control Module PCM is an on-board electronic control unit that primarily controls the charging, emission and transmission systems of the vehicle

It is always good to be aware of the symptoms of any trouble code as it will help you to identify the code. Here are some common symptoms which you may notice when this code appears:

• Reduced engine performance
• Hesitation while acceleration
• Trouble while starting
• Excessive smoke while exhaust
• Illuminated check engine light

Code P0260 is an indication that the fuel injection pump cannot control fuel into the engine intermittently, and the failure may be internal or external of the injection pump. The problem would need to be verified in order to find and repair the vehicle’s engine. Following repairs or replacements may help to fix this code:

• Check all the wiring and connections carefully. Repair or replace the damaged ones.
• Inspect the fuel injection pump, replace if found faulty.
• Replace the faulty fuel injection pump actuator.
• Replace the failed PCM (Rare).

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Below mentioned are the steps to diagnose the trouble code P0260:

• Locate the FRP sensor on your vehicle.
• Visually inspect the connector and wiring.
• Pull the connector apart and carefully inspect the terminals (the metal parts) inside the connector.
• Use electrical contact cleaner and a plastic bristle brush if cleaning of the terminals is needed. Let dry and apply electrical grease where the terminals contact.
• Clear the diagnostic trouble codes from memory, and see if P0260 code returns.
• If the P0260 code does return, we will need to test the FRP sensor and its associated circuits.
• Connect a Digital Voltmeter black lead to the ground terminal at the FRP sensor wiring harness connector. Connect the red lead of the Digital Voltmeter to the power terminal at the FRP sensor wiring harness connector. Voltmeter should read either 12 volts or 5 volts. If not, repair the power or ground wire, or replace the PCM.
• If you continue to get a P0260, this would most likely indicate a failed FRP sensor / Fuel Quantity Actuator, although a failed PCM could not be ruled out until the FRP sensor / Fuel Quantity Actuator had been replaced.

Common Mistakes When Diagnosing the P0260 Code

In order to avoid committing any mistake one should follow the proper diagnostic steps and should seek help of experienced diagnostician if required. Sometimes people do unnecessary replacements due to the lack of proper diagnosis. People usually replace Injector pumps and Injectors wherein the actual cause is not even diagnosed.

P0255 - Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector)