P04C9
Fuel Fill Door Open Request Sensor/Switch Performance/Stuck Off
Generic OBD-II
Common symptoms
What you'll notice
- Check fuel fill door for any obstructions or damage and ensure it closes properly.
- Inspect and test the fuel fill door open request sensor/switch for any signs of malfunction or stuck position.
- Clean or replace the fuel fill door open request sensor/switch if necessary.
- Check and repair any wiring or electrical connections related to the fuel fill door open request sensor/switch.
- If all else fails, consider replacing the fuel fill door open request sensor/switch to resolve the issue.
Common causes
Most likely first
- Faulty fuel fill door open request sensor/switch
- Damaged wiring or connection issues with the sensor/switch
- Obstruction or debris preventing proper functioning of the sensor/switch
- Malfunctioning control module or software issue
- Defective fuel fill door latch mechanism
How to diagnose & fix
Work through it in order
- Fuel fill door does not open when requested
- Warning light illuminates on the dashboard
- Unable to refuel the vehicle/motorcycle
- Fuel odor around the vehicle/motorcycle
- Fuel efficiency decreases
Read & clear P04C9 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.