Powertrain
generic / SAE
P04B0
Refueling Vapor Control Valve Circuit Open
The refueling vapor control valve - typically part of the ORVR or capless fueling system - has an open control circuit. The valve directs fuel vapor from the tank into the canister during refueling and must open when the fuel filler is opened. Without it, vapor escapes during refueling and the system fails leak diagnostics.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / B0
Possible causes
- Open in harness or solenoid winding high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–400 €
- Estimated time: 0.8–1.8 h
- Component: refueling vapor valve
- Component: vapor canister
- Component: fuel filler assembly
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012