Powertrain
generic / SAE
P0499
EVAP System Vent Valve Control Circuit High
Same as P0498 with the control line open or shorted to supply. 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 / 99
Possible causes
- Control line open high
- Control line shorted to supply medium
- Connector pins corroded - high contact resistance 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: 80–250 €
- Estimated time: 0.4–1.2 h
- Component: evap vent valve
- Component: evap vent wiring
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012