P04B4

Refueling Vapor Control Valve Stuck Closed

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Difficulty starting the engine
Increased fuel consumption
Smell of gasoline in the cabin
Check Engine Light Is On

Causes

Fuel vapor control valve jammed
Open or shorted valve wiring harness
Engine control unit malfunction
Valve contamination

How to Fix

Check the fuel vapor control valve for jamming
Check wiring harness and valve connectors
Clean or replace valve if necessary
Reset the error and check the operation of the EVAP system

Related codes

P0440 P0441 P0442 P0443