P04B7
Fuel Fill Door Position Sensor/Switch Circuit Intermittent/Erratic
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring and connections of the fuel fill door position sensor/switch
- Inspect and clean the fuel fill door position sensor/switch
- Replace the fuel fill door position sensor/switch
- Reset the vehicle's computer system to clear any intermittent error codes
Common causes
Most likely first
- Loose or faulty fuel fill door position sensor/switch connection
- Damaged or malfunctioning fuel fill door position sensor/switch
- Wiring issues or short circuit in the fuel fill door position sensor/switch circuit
- Incorrect fuel fill door positioning or alignment
- Faulty body control module (BCM) or engine control module (ECM)
How to diagnose & fix
Work through it in order
- Fuel fill door does not open/close properly
- Check engine light illuminates intermittently
- Inability to start the vehicle
- Poor fuel economy
- Fuel smell inside or outside the vehicle
Read & clear P04B7 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.