Injection Pump Fuel Metering Control "B" Intermittent (Cam/Rotor/Injector)
P0260 indicates the engine control module detected an intermittent problem with the fuel injection pump metering control circuit, specifically the fuel rail pressure (FRP) sensor signal. This code typically affects diesel engines and suggests the sensor is not communicating properly with the ECU, causing incorrect fuel delivery adjustments.
What You Might Notice
- Check engine light illuminated
- Decreased fuel economy
- Rough idle or hesitation during acceleration
- Intermittent power loss
- Difficulty starting the engine
Most Common Causes
- 1
Fuel Rail Pressure (FRP) Sensor Circuit Fault
Open, shorted, or intermittent wiring in the FRP sensor signal circuit prevents proper voltage transmission to the ECU. This is the most common cause in diesel fuel injection systems.
- 2
Fuel Rail Pressure Sensor Failure
The FRP sensor itself may be failing intermittently, causing erratic signal readings that the ECU cannot reliably interpret.
- 3
Injection Pump Control Circuit Malfunction
Electrical issues within the fuel injection pump control solenoid or its wiring can trigger this code when the metering control signal becomes intermittent.
- 4
ECU Connector or Ground Issues
Loose, corroded, or damaged connectors at the ECU or poor ground connections can cause intermittent signal loss to the metering control system.
How to Diagnose It
- 1
Check Fuel Rail Pressure (FRP) Sensor Circuit Fault — Open, shorted, or intermittent wiring in the FRP sensor signal circuit prevents proper voltage transmission to the ECU. This is the most common cause in diesel fuel injection systems.
- 2
Check Fuel Rail Pressure Sensor Failure — The FRP sensor itself may be failing intermittently, causing erratic signal readings that the ECU cannot reliably interpret.
- 3
Check Injection Pump Control Circuit Malfunction — Electrical issues within the fuel injection pump control solenoid or its wiring can trigger this code when the metering control signal becomes intermittent.
- 4
Check ECU Connector or Ground Issues — Loose, corroded, or damaged connectors at the ECU or poor ground connections can cause intermittent signal loss to the metering control system.
How to Fix It
- 1
Inspect and Repair FRP Sensor Wiring
Check the fuel rail pressure sensor harness for cracks, corrosion, or loose connections. Test continuity and voltage at the sensor connector using a multimeter. Repair or replace damaged wiring and connectors.
- 2
Replace Fuel Rail Pressure Sensor
If the wiring tests good, the FRP sensor is likely failing intermittently. Replace the sensor with an OEM or quality aftermarket part and clear the code to verify resolution.
- 3
Test and Service Fuel Injection Pump
Perform electrical tests on the fuel injection pump metering control solenoid. Check for proper voltage and resistance values. Service or replace the pump if electrical values are out of specification.
- 4
Check ECU Ground and Connectors
Inspect the ECU connectors for corrosion and ensure all ground straps are clean and tight. Clean connectors with electrical contact cleaner and reconnect firmly, then retest the system.
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