Powertrain
generic / SAE
P04AB
EVAP System Purge Control Valve B Circuit Open
The second EVAP purge control valve (B) - used on systems with a divided purge path or on twin-bank engines - shows an open control circuit. The ECU cannot drive the valve, so vapor cannot be purged through this stage; tank pressure may rise and emissions diagnostics fail.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / AB
Possible causes
- Open in harness or connector high
- Solenoid winding open medium
- Pin pushed back out of connector body 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: 80–280 €
- Estimated time: 0.5–1.4 h
- Component: evap purge valve b
- Component: evap purge wiring b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012