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Summary
  • Diagnostic trouble code (DTC) P2422 stands for “Evaporative Emission System Vent Valve Stuck Closed.”
  • The EVAP system’s vent valve is normally open. It only closes when the PCM initiates a test as part of the mandated OBD-II standards. When the PCM detects that the EVAP system is closed even when it shouldn’t, it will set the code P2422.
  • The most common causes of the P2422 code include EVAP vent valve failure, vent valve control circuit wiring issues, malfunctioning vent valve solenoid, and faulty PCM.

The evaporative (EVAP) emission system prevents gasoline fumes and vapors from being released into the atmosphere. It directs the vapors from the fuel tank to the intake where they’re burned in the normal combustion process.

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The EVAP system has a canister vent valve that lets fresh air into the system. It is normally open unless the powertrain control module (PCM) commands it to close during testing. When the PCM detects that the valve is stuck, on-board diagnostics (OBD) will log a P2422 code.

What Does the P2422 Code Mean?

Diagnostic trouble code (DTC) P2422 stands for “Evaporative Emission System Vent Valve Stuck Closed.”

man gets obd code after car inspection
When the PCM detects that the valve is stuck, on-board diagnostics (OBD) will log a P2422 code.

The EVAP system’s vent valve is normally open. It only closes when the PCM initiates a test as part of the mandated OBD-II standards. When the PCM detects that the EVAP system is closed even when it shouldn’t, it will set the code P2422.

A DTC P2422 could mean that the valve is stuck closed or can’t be opened due to issues with the control system.

Note: The definition of code P2422 can be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P2422 Code?

What are the Common Symptoms of the P2422 Code?

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How to Diagnose the P2422 Code

Trouble code P2422 is a generic powertrain code that various makes and models can log. Although vehicles could exhibit similar symptoms, the steps for diagnosis and repair might vary depending on the vehicle’s specifications.

If you’re not familiar with the process of diagnosing trouble codes by yourself, it’s a good idea to bring your vehicle to a certified mechanic. But if you’re a seasoned DIYer and you know your way around a scan tool, then you can go ahead and do it yourself.

To help you out, we’ve gathered a video that show what the process might involve:

How to Fix the P2422 Code

Attempting to fix a P2422 code can be a frustrating and confusing task if you’re not equipped with the right tools and information. If you’re not confident with your DIY skills yet, it might be best to leave the job to the pros.

But if you think you have the automotive know-how to do the job yourself, make sure you have the right manuals before attempting any fixes. Consult guides like those from Chilton or an ALLDATA subscription for vehicle-specific repair information.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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