P04C3
Fuel Fill Door Lock Position Sensor Circuit
A general circuit fault is detected on the fuel fill door lock position sensor or switch. Without it the ECU cannot determine whether the lock has actually engaged or released.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Open in sensor circuitCommon
Parts involved
- Fuel Fill Door Lock Position Sensor
P04C3 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.