P04B8
Fuel Fill Door Position Sensor/Switch Circuit
P04B8 is an OBD-II diagnostic trouble code meaning: Fuel Fill Door Position Sensor/Switch Circuit. Common causes: cover position sensor/switch malfunction, open or shorted wiring harness. Estimated repair cost: $22–89.
Symptoms
- Check Engine Light Is On
- Error when checking the tightness of the EVAP system
- Possible problems with fuel refueling
Causes
- Cover position sensor/switch malfunction
- Open or shorted wiring harness
- Poor contact in the sensor connector
- Mechanical damage to the fuel tank cap
- Problems with the engine control unit
How to Fix
- Visual inspection of the fuel tank cap and sensor
- Checking the integrity of the wiring harness and contacts
- Testing the sensor with a multimeter
- Replacing a faulty sensor or cover
- Clearing error codes and checking the system
Related codes
Error P04B8 by Vehicle Brand
FAQ
What does the P04B8 code mean?
P04B8 is an OBD-II diagnostic trouble code that indicates: Fuel Fill Door Position Sensor/Switch Circuit
What causes a P04B8 error code?
The most common causes of P04B8 include: Cover position sensor/switch malfunction; Open or shorted wiring harness; Poor contact in the sensor connector; Mechanical damage to the fuel tank cap.
How do I fix a P04B8 diagnostic trouble code?
To fix P04B8: Visual inspection of the fuel tank cap and sensor. Checking the integrity of the wiring harness and contacts. Testing the sensor with a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P04B8?
Yes, but get it checked soon
How much does it cost to fix P04B8?
The estimated repair cost for P04B8 is $22–89. Actual cost depends on your vehicle, location, and labor rates.
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