P04C8
Fuel Fill Door Open Request Sensor or Switch Circuit
A general circuit fault is detected on the open-request input - the button or switch the driver presses to release the fuel fill door. The ECU loses the request signal, so motorised release becomes unavailable.
A general circuit fault is detected on the open-request input - the button or switch the driver presses to release the fuel fill door. The ECU loses the request signal, so motorised release becomes unavailable.
Common causes
- high
Open in switch circuit
One of the most commonly reported causes for this code — check this first.
Typical part cost: $70-240
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P04C8 mean?
P04C8 means "Fuel Fill Door Open Request Sensor or Switch Circuit". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P04C8?
open in switch circuit — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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