P2422 EVAP vent valve will not open, so fresh air cannot get into the fuel vapour system

EVAP system vent valve stuck closed / restricted vent

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P2422 is an emissions fault that usually causes no driving problem, and KBB says you can keep driving if it is the only code, though it will fail an emissions test.

Source: how we rate severity

P2422 in short

P2422 means the EVAP vent valve is stuck closed or the vent path is blocked, so the system cannot draw in fresh air. Dirt or spider webs in the vent line are common, then a failed vent valve. The car normally drives fine, but it will not pass an emissions test until fixed.

The EVAP system traps fuel vapour from the tank. When the computer tests it, it closes the vent valve and uses engine vacuum, then opens the vent so fresh air can enter again. If the vent does not open, or the path behind it is blocked, the test fails and P2422 is stored.

The cause is not always the valve itself. Honda, Kia and Hyundai bulletins point to dirt or spider webs in the vent tube or lines, a vent joint fitted upside down, or the detection software on one Sonata.

Because the code often traces to a blockage, check the vent path before buying a valve.

Most likely causes

  1. Dirt or spider webs blocking the EVAP vent tube or lines

    Supported by vehicle data
    Why it ranks here
    Honda says dirt may clog the canister vent tube on Accord, Pilot, Passport and Ridgeline, and Kia says spider webs in the vent lines set P2422 on Sorento and Sportage. This is a repeated pattern across several makes.
    What would change this
    Rises if the vent tube or filler neck area shows webs or dirt, or the vent opens freely once cleared. Falls if the path is clear and the valve still will not open.
    How to test the evap charcoal canister

  2. Vent valve or canister closed valve stuck or failed

    Common general cause
    Why it ranks here
    KBB lists the vent valve itself and its control solenoid as the first causes of a stuck-closed vent code.
    What would change this
    Rises if the valve does not click or move when commanded on a scan tool and the path is clear. Falls if the valve works and airflow is blocked elsewhere.
    How to test the evap canister vent valve

  3. Wiring, connector or vacuum line fault at the vent valve

    Possible — needs testing
    Why it ranks here
    KBB names wiring and connector faults in the vent valve control circuit and vacuum line problems as further causes.
    What would change this
    Rises if the connector is corroded or loose or the valve has power but no control. Falls if the circuit tests normal.

  4. Fuel tank pressure sensor vent joint installed upside down (2011-2012 Ridgeline)

    Supported by vehicle data
    Why it ranks here
    Honda bulletin 12-028 says moisture can enter and block the vent when the fuel tank pressure sensor vent end joint was installed upside down, setting P1454 and/or P2422 on 2011-2012 Ridgelines.
    What would change this
    Rises on a 2011-2012 Ridgeline with moisture in the vent joint. Falls on other models.
    How to test the fuel tank pressure sensor

  5. Engine computer detection logic (2020 Sonata)

    Supported by vehicle data
    Why it ranks here
    Hyundai bulletin 21-01-009H updates the ECM software that detects a restricted vent valve for P2422 on the 2020 Sonata. It applies to one model and year only.
    What would change this
    Rises if a dealer finds your VIN covered and the software is not updated. Falls on other vehicles or when the software is current.
    How to test the engine control module (ecm / pcm)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. With the engine off and cool, look at the visible EVAP vent hose, filter and filler neck area for dirt, webs or a kinked hose.

    Low risk

  2. Use a scan tool to command the vent valve open and closed and listen for a click.

    Low riskTool: bidirectional scan tool

  3. Ask a dealer whether your model has a bulletin for P2422. Honda, Kia, Hyundai and Mazda have issued them.

    Low risk

Symptoms

  • Check engine light with no change in how the car drives
  • Fails an emissions test
  • A dusty or off-road driving history, or a spider-infested filler neck area

How to fix

  1. With the engine off, check that the visible EVAP vent hose near the fuel filler and canister is attached, not kinked and free of webs or dirt.

  2. Ask a dealer whether your VIN has an open bulletin for P2422.

Parts and cost context

  • EVAP canister vent valve:Check the vent path for blockage before replacing the valve. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Honda

  • 2013–2017 · Accord

    Supported by vehicle data

    Honda bulletin A15-010 says dirt may clog the canister vent tube when P2422 sets. Whether it is still current is not verified.

  • 2016–2022 · Pilot

    Supported by vehicle data

    Honda A20-056 covers P2422 on the Pilot (and Passport). Whether it is still current is not verified.

  • 2011–2022 · Ridgeline

    Supported by vehicle data

    Honda has bulletins for P2422 on the Ridgeline: 12-028 (2011-2012, vent joint fitted upside down) and A20-002 (2017-2022). Whether they are still current is not verified.

  • A15-010Status unverified

    P2422, dirt may clog the EVAP canister vent tube

    2013–2017accord · issued · NHTSA 10099929

    Honda says dirt may be clogging the canister vent tube on cars that set P2422. The NHTSA summary does not give the repair steps.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • A20-056Status unverified

    MIL on with P2422

    2016–2022pilot, passport · issued · NHTSA 10178456

    Same vent shut valve stuck closed wording as A15-010; the summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • A20-002Status unverified

    MIL on with P2422

    2017–2022ridgeline · issued · NHTSA 10172364

    Honda service bulletin for Ridgeline with P2422; the summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 12-028Status unverified

    MIL on with P1454 and/or P2422

    2011–2012ridgeline · issued · NHTSA 10044252

    The fuel tank pressure sensor vent end joint may have been fitted upside down, so moisture blocks the vent.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Kia

  • 2011–2013 · Sorento

    Supported by vehicle data

    Kia PS162R1 says spider webs in the EVAP vent lines may set P0449 or P2422. Whether it is still current is not verified.

  • 2017–2019 · Sportage

    Supported by vehicle data

    Kia PS532 R1 says to look for spider nests between the filler neck and canister. Whether it is still current is not verified.

  • PS162R1Status unverified

    Sorento (XM) with P0449 or P2422

    2011–2013sorento · issued · NHTSA 10090167

    Check the filter assembly and EVAP vent lines for spider webs or debris before replacing parts; clear with a pipe cleaner, not compressed air.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • PS532_R1Status unverified

    P0449 and P2422 on Sportage (QL)

    2017–2019sportage · issued · NHTSA 10152892

    If the closed valve and circuit are fine, look for a spider nest between the filler neck and canister and remove it with a pipe cleaner.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Hyundai

  • 2020 · Sonata

    Supported by vehicle data

    Hyundai 21-01-009H updates the ECM detection logic for P2422. Whether it is still current is not verified.

  • 21-01-009HStatus unverified

    ECM update for P2422

    2020sonata · issued · NHTSA 10188246

    ECM software update that revises the detection logic for P2422, EVAP restricted vent valve.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0446EVAP vent control performance problem

    Same system Supported by vehicle data

    Kia bulletin 006 covers P0446 and P2422 together, because both involve the EVAP vent control.

  • P0449EVAP vent valve circuit fault

    Shares causes Supported by vehicle data

    Kia Sorento and Sportage bulletins list P0449 and P2422 together; spider webs in the vent lines can set either.

All EVAP (evaporative emissions) codes

Sources and review

  1. P2422 code: EVAP system vent valve stuck closed — Kelley Blue Book (KBB Service Advisor)
  2. Honda A15-010: MIL on with P2422, dirt may clog the EVAP canister vent tube — American Honda / NHTSA ,
  3. Honda A20-056: MIL on with P2422 on Pilot and Passport — American Honda / NHTSA ,
  4. Kia PS162R1: Sorento (XM) with P0449 or P2422, spider webs in EVAP vent lines — Kia America / NHTSA ,
  5. Kia PS532 R1: Sportage with P0449 and P2422, inspect EVAP ventilation for restrictions — Kia America / NHTSA ,
  6. Honda 12-028: MIL on with P1454 and/or P2422 on Ridgeline — American Honda / NHTSA ,
  7. Hyundai 21-01-009H: ECM update revising detection logic for P2422 — Hyundai Motor America / NHTSA ,
  8. Mazda SA-059-25: check engine light with P0451, P2422, P2451 or P0441 — Mazda North American Operations / NHTSA ,
  9. Kia 006: enhanced diagnosis and repair for P0446 / P2422 — Kia Motors America / NHTSA ,
Last reviewed
Written by
Saurabh K.
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