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

Where it lives

For P0256, the description names the injector as the part involved.

Check these first

• A faulty camshaft or rotor position sensor
• An open or short in the metering control B circuit
• A faulty fuel injector control module
• Corrosion in the metering control B connector
• Internal failure in the injection pump

What to do next

1. Read metering control B commanded and actual on a scan tool
2. Inspect the metering control B wiring and connector for damage
3. Check the camshaft or rotor position sensor signal
4. Test fuel pressure and flow at the pump
5. Replace the injector control module or injection pump if the command is not followed
6. Clear the code and retest

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