P04C6Fuel Fill Door Lock Position Sensor/Switch Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- On plug-in hybrids with a sealed, pressurised tank, pressing the fuel button (open request) starts a refuelling mode: the module opens the tank valve, releases the pressure into the charcoal canister and only then unlocks the filler door via an electric actuator (Ford patent). The lock position sensor in the actuator reports locked or unlocked – not to be confused with the door position sensor (open or closed, P04B7–P04BA). P04C6 means its signal is permanently above the valid range – a short to positive, or an open circuit with a pull-up input. No manufacturer document available to us uses this code; the description follows CARB's rules for input and output components and patents on the door actuator.
- What you may notice
- Filler door does not unlock or lock reliably
- Refuelling system message
- Possibly check engine light
- Likely causes
- LikelyWire shorted to positive or open (pull-up)
- PossibleSwitch in the actuator faulty
- PossibleWater ingress
- RareModule
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.