P2422: EVAP System Vent Valve Stuck Closed

What it means

The control module detects that the EVAP system vent valve remains closed when it is expected to open. This can interfere with EVAP operation and leak testing.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The EVAP vent valve admits filtered air to the charcoal canister and is expected to open during certain system operations. This code sets when the module detects that the valve remains closed when it should open, which can interfere with normal EVAP operation and leak testing.

Common causes

Most likely first.

1. Vent valve seized closed
2. Drive circuit open
3. Carbon or debris buildup preventing free movement

Symptoms

• Check engine light on

How to diagnose it

1. Review freeze-frame data and related EVAP codes to identify when the module expected the vent valve to open.
2. Inspect the vent valve inlet and surrounding hoses for blockage, dirt, or debris that could restrict airflow.
3. Check the valve connector and wiring for an open circuit, loose contact, corrosion, or visible damage.
4. Use a scan tool to command the vent valve open, if supported, and check whether it responds and allows airflow as expected.
5. Test the valve drive circuit and valve operation against the manufacturer's specifications to distinguish a seized valve from an electrical fault.

Common fixes

• Clear debris blocking the vent valve inlet using the vehicle's specified service method.
• Reconnect or repair an open or damaged vent-valve drive circuit.
• Replace the EVAP vent valve if it is seized closed or fails an operation test.
• Repair a confirmed module-side valve-control fault.

Can I keep driving?

The vehicle is generally driveable if it runs normally, but a closed vent valve can disrupt EVAP operation and emissions testing. Arrange diagnosis soon, and pay attention to difficulty refuelling or new fuel vapour odours.