Powertrain
generic / SAE
P2451
EVAP System Switching Valve Stuck Closed
The EVAP switching valve - which directs vapor flow between purge and leak-detection paths - is stuck in the closed position. The diagnostic cycle cannot complete.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 51
Possible causes
- Valve stuck closed high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–400 €
- Estimated time: 0.6–1.8 h
- Component: evap switching valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012