P2422

EVAP System Vent Valve Stuck Closed

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2422 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX