P2422
EVAP System Vent Valve Stuck Closed
EVAP (emissions)
Generic OBD-II
Low
What it means
P2422 means the EVAP vent valve is stuck in the closed position. This valve lets fresh air into the charcoal canister so the fuel-vapor system can breathe and be leak-tested; stuck closed, the system can't vent or complete its self-test. The engine runs normally, but you may notice slow fueling at the pump, and the car won't pass an emissions test until the valve is cleaned or replaced.
Low
Can I keep driving? Yes — this is an emissions fault; the car drives normally, though you may notice slow fuel filling, and it will fail an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Fuel pump may click off repeatedly or fill slowly at the pump
- No real change in how the engine runs
- EVAP monitor won't complete / fails an emissions test
Common causes
Most likely first
- Stuck or contaminated EVAP vent valve (debris from the charcoal canister)Likely
- Clogged or degraded charcoal canister restricting the vent pathCommon
- Faulty vent valve or its wiring/connectorCommon
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan and confirm P2422, then locate the vent valve (usually at the charcoal canister).
- Command the valve open/closed with a scan tool and listen/feel for operation.
- Inspect the valve for dirt or debris and check the canister for clogging.
- Test the valve's resistance and wiring against spec.
- Replace the vent valve (and canister if contaminated), then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2422?+
Yes. A stuck-closed vent valve blocks the EVAP system's fresh-air path but doesn't affect the engine. You may notice slow fueling at the pump, and it will fail an emissions test.
Can I just clear P2422?+
It returns until the vent valve is freed or replaced. Because the valve is stuck closed, clearing the code won't fix the underlying fault.
Related codes
Often seen with P2422
Read & clear P2422 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX