Powertrain
generic / SAE
P0498
EVAP System Vent Valve Control Circuit Low
The vent valve closes the EVAP canister to atmosphere during leak tests. The control line for that valve is shorted to ground - the ECU drives the valve and measures voltage below the expected level, indicating either a harness short or an internal solenoid short.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 98
Possible causes
- Control line shorted to ground high
- Vent solenoid internally shorted 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