P04CB
Fuel Fill Door Open Request Sensor/Switch Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check the fuel fill door for any obstructions or damage
- Inspect the fuel fill door sensor/switch for any signs of malfunction or loose connections
- Repair or replace the faulty fuel fill door sensor/switch if necessary
- Reset the vehicle's computer system to clear any error codes related to the sensor/switch circuit
Common causes
Most likely first
- Faulty fuel fill door open request sensor/switch
- Wiring or connection issue with the fuel fill door open request sensor/switch
- Faulty body control module (BCM)
- Electrical issue related to the fuel fill door open request sensor/switch circuit
- Malfunctioning instrument cluster or related components
How to diagnose & fix
Work through it in order
- Fuel fill door remains open or does not close properly
- Warning light or message indicating fuel fill door open
- Inability to refuel vehicle due to open fuel fill door
- Fuel smell around the fuel fill area
- Vehicle fuel efficiency decreases due to fuel leakage
Read & clear P04CB yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.