OBD-II code · Powertrain (generic)
P04CD Fuel Fill Door Open Request Sensor or Switch Stuck On
The open-request switch is stuck in the active state - the ECU continuously reads a request to open the fuel fill door. Either the switch is mechanically held closed or the line is shorted to its active level.
Is it safe to drive with P04CD?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySwitch contact mechanically stuck closed
- 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
- 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
- P04CEEGR Temperature Sensor C Circuit
- P04CFEGR Temperature Sensor C Circuit Range or Performance
- P04D0EGR Temperature Sensor C Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.