OBD-II code · Powertrain (generic)
P04C8 Fuel Fill Door Open Request Sensor or Switch Circuit
A general circuit fault is detected on the open-request input - the button or switch the driver presses to release the fuel fill door. The ECU loses the request signal, so motorised release becomes unavailable.
Is it safe to drive with P04C8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in switch circuit
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Fill Door Request Switch
Related codes
- P04C5Fuel Fill Door Lock Position Sensor Circuit Low
- P04C6Fuel Fill Door Lock Position Sensor Circuit High
- P04C7Fuel Fill Door Lock Position Sensor Circuit Intermittent or Erratic
- P04C9Fuel Fill Door Open Request Performance Stuck Off
- P04CAFuel Fill Door Open Request Sensor or Switch Circuit Low
- P04CBFuel Fill Door Open Request Sensor or Switch Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.