OBD-II code · Powertrain (generic)
P04BF Fuel Fill Door Unlock Control Circuit Open
Fuel Fill Door Unlock Control Circuit Open: the control circuit is open. Likely a broken wire, disconnected connector, or failed actuator.
Is it safe to drive with P04BF?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in harness or actuator winding
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–1.4 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Fill Door Unlock Actuator
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.