What are the common causes of P04B3?

A refueling vapor valve stuck open. Debris holding the refueling vapor valve open. A failed refueling vapor valve solenoid. A clogged charcoal canister.

Command the refueling vapor valve closed on a scan tool. Remove the refueling vapor valve and check it for debris. Check the charcoal canister for a restriction. Replace the refueling vapor valve if it stays open. Clear the code and retest.

P04B3

Refueling Vapor Control Valve Stuck Performance/Stuck Open

System: Auxiliary emission controls (P code)
Lamp: Check Engine Light
Category: Powertrain - Auxiliary Emissions Controls

What it means

P04B3 means Refueling Vapor Control Valve Stuck Performance/Stuck Open.

Where it lives

For P04B3, start at the valve the description names.

Check these first

A refueling vapor valve stuck open
Debris holding the refueling vapor valve open
A failed refueling vapor valve solenoid
A clogged charcoal canister

What to do next

Command the refueling vapor valve closed on a scan tool
Remove the refueling vapor valve and check it for debris
Check the charcoal canister for a restriction
Replace the refueling vapor valve if it stays open
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.