Powertrain
generic / SAE
P04AC
EVAP System Purge Control Valve B Circuit Low
Same as P04AB with the control line shorted to ground. 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 / AC
Possible causes
- Control line shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation 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
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012