P04C4
Fuel Fill Door Lock Position Sensor Circuit Range or Performance
Same as P04C3 with feedback in plausible range yet not matching the commanded lock state.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Sensor signal offsetCommon
Parts involved
- Fuel Fill Door Lock Position Sensor
P04C4 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.