OBD-II code · Powertrain (generic)
P04C9 Fuel Fill Door Open Request Performance Stuck Off
The open-request switch never registers an active state - either the contact stays open mechanically or the wiring is permanently broken. The driver cannot trigger door release.
Is it safe to drive with P04C9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySwitch contact stuck open
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
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
- P04C6Fuel Fill Door Lock Position Sensor Circuit High
- P04C7Fuel Fill Door Lock Position Sensor Circuit Intermittent or Erratic
- P04C8Fuel Fill Door Open Request Sensor or Switch Circuit
- P04CAFuel Fill Door Open Request Sensor or Switch Circuit Low
- P04CBFuel Fill Door Open Request Sensor or Switch Circuit High
- P04CCFuel Fill Door Open Request Sensor or Switch Circuit Intermittent or Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.