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.
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.
Common causes
- high
Open in harness or solenoid winding
One of the most commonly reported causes for this code — check this first.
Typical part cost: $130-440
- low
Pin pushed back out of connector body
Less common, but worth ruling out after the more likely causes.
Typical part cost: $130-440
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
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Frequently asked questions
What does P04B0 mean?
P04B0 means "Refueling Vapor Control Valve Circuit Open". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P04B0?
open in harness or solenoid winding; pin pushed back out of connector body; cracked solder joint inside the module or sensor — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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