P04C5Fuel Fill Door Lock Position Sensor/Switch Circuit Low
- 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). P04C5 means its signal is permanently below the valid range – a short to ground, or with a switch to ground permanently closed. 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 to the lock sensor shorted to ground
- 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.