P2408
Fuel Cap Sensor/Switch Circuit Range/Performance
On vehicles with a sensed fuel cap, the cap-status signal is electrically valid but does not change as expected when the cap is opened or closed.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Cap switch wornCommon
- Cap seal aged, switch never seatsPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Fuel Cap Sensor
- Sensor Wiring
P2408 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.