Powertrain
generic / SAE
P2DDB
EVAP System Leak Detection Pump Stuck On
The EVAP leak detection pump stays running when commanded off. Relay welded or driver stuck on. 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
GroupP2
Range / numberD / DB
Possible causes
- Relay contacts welded high
- Output driver stuck on medium
- Carbon or debris buildup preventing free movement 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: medium
- DIY: possible
- Estimated cost: 80–500 €
- Estimated time: 0.5–2 h
- Component: evap leak detection pump
- Component: wiring harness
- Component: ecm
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012