P2422 Evaporative Emission System Vent Valve Stuck Closed

P2422 means the EVAP vent valve, which normally lets the charcoal canister breathe, appears stuck closed. With the vent shut the system cannot equalise, so leak-detection results and pressure readings fall outside the expected range.

Code details

Generic OBD-II · P2

System: Emissions
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not condemn the charcoal canister before verifying the vent valve actually moves, because a stuck valve or blocked vent filter is the usual cause.

Symptoms of P2422

Check-engine light.
Occasionally slow or difficult refuelling.
No obvious drivability change.

Common causes of P2422

A stuck or failed EVAP vent-control valve.
A blocked vent filter or debris in the valve.
Vent-valve wiring or connector faults.
A charcoal-canister problem.

Useful checks before replacing parts

Command the vent valve on a scan tool and confirm it opens.
Inspect the vent valve and its filter for debris, dirt, or corrosion.
Check the vent-valve wiring and connector.

Related OBD-II codes

These nearby emissions entries can help compare wording and pin down the fault area.