P2407
EVAP Leak Detection Pump Sense Circuit Range/Performance
The leak detection pump returns a sense signal that is electrically valid but does not match the expected response during the pump's self-test or pressure cycle.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Pump diaphragm wornCommon
- Sense wiring high resistancePossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- EVAP Leak Detection Pump
- EVAP Pump Wiring
P2407 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.