P0260 Injection Pump Fuel Metering Control B Intermittent (Cam/Rotor/Injector)

P0260 points to intermittent injection pump fuel metering control B. The metering B command or feedback signal becomes unstable only sometimes.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear intermittent fuel metering control B codes without reproducing and locating the signal dropout.

Symptoms of P0260

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0260

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Graph metering B command, pressure feedback, pump data, RPM, load, and voltage while repeating the stored fault conditions.
Inspect connector locking, terminal tension, harness rub points, heat-related opens, fuel contamination, and intermittent power or ground faults.
Check whether the fault appears with vibration, hot operation, heavy load, start attempts, or after pump wiring service.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.