P2400
EVAP Leak Detection Pump Control Circuit Open
The control circuit to the EVAP leak-detection pump is open. Without that pump the ECU cannot pressurise the fuel-vapour system to test for leaks.
- 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.
- Leak detection pump failedCommon
- Wiring open to pumpPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- EVAP Leak Detection Pump
- EVAP Pump Wiring
P2400 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.