Powertrain
generic / SAE
P04B1
Refueling Vapor Control Valve Circuit Low
Same as P04B0 with the control line shorted to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / B1
Possible causes
- Control line shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–400 €
- Estimated time: 0.8–1.8 h
- Component: refueling vapor valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012