P0449
Evaporative Emission System Vent Valve/Solenoid Circuit Malfunction
A general electrical fault was detected in the EVAP vent valve/solenoid control circuit. Without a working vent valve the EVAP leak test cannot complete and the system may remain not-ready.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
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.
- Vent valve electrically failedCommon
- Wiring or connector faultPossible
Parts involved
- EVAP Vent Valve
- Vent Valve Wiring
P0449 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.