P04AE
EVAP System Purge Control Valve B Performance Stuck Open
EVAP System Purge Control Valve B Performance Stuck Open: the component is electrically intact but its response does not match the command.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Debris on valve seat prevents full closingCommon
- Return spring weakenedPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- EVAP Purge Valve B
P04AE is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.