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

Where it lives

For P0255, the part to look at first is the injector named here.

Check these first

• An intermittent open in the metering control A circuit
• Corrosion or water in the metering control A connector
• A failing fuel pressure sensor
• Faulty fuel injectors or injector circuits
• A failing injection pump

What to do next

1. Watch metering control A on a scan tool while wiggling the harness
2. Inspect the metering control A wiring and connector for corrosion or water
3. Check fuel pressure and flow at the pump
4. Test the injectors for a weak spray pattern
5. Replace the injection pump if the command drops out under load
6. Clear the code and retest

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