Powertrain
generic / SAE
P0459
EVAP System Purge Control Valve A Circuit High
EVAP purge control valve A drive line stuck high — short to B+. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 59
Possible causes
- Short to B+ high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source 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: easy
- DIY: possible
- Estimated cost: 40–300 €
- Estimated time: 0.3–1.5 h
- Component: evap purge valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012