What are the common causes of P04B2?

A short to power in the refueling vapor valve circuit. A failed refueling vapor control valve. A chafed refueling vapor valve wire. A faulty PCM driver.

Check the refueling vapor valve circuit for a short to power. Measure the refueling vapor valve resistance. Inspect the refueling vapor valve wire for chafing. Replace the refueling vapor valve if the circuit is shorted to power. Clear the code and retest.

P04B2

Refueling Vapor Control Valve Circuit High

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

What it means

P04B2 means Refueling Vapor Control Valve Circuit High.

Where it lives

For P04B2, the circuit described runs through the valve. The description of P04B2 reports a fault at the valve.

Check these first

A short to power in the refueling vapor valve circuit
A failed refueling vapor control valve
A chafed refueling vapor valve wire
A faulty PCM driver

What to do next

Check the refueling vapor valve circuit for a short to power
Measure the refueling vapor valve resistance
Inspect the refueling vapor valve wire for chafing
Replace the refueling vapor valve if the circuit is shorted to power
Clear the code and retest

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Updated

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