P2450 EVAP switching valve (fuel tank isolation valve) not working as commanded

Evaporative emission system switching valve performance / fuel tank isolation valve stuck

Monitor

The bulletins describe a lit check engine light and, on plug-in hybrids, trouble refuelling, rather than a driving hazard, but one F-150 owner reports the truck cutting out after a stop.

It gets more serious if:

  • Inspect soon: Inspect soon if the engine cuts out or hesitates when accelerating after a stop, or on a plug-in hybrid if the fuel door will not open.

Source: how we rate severity

P2450 in short

P2450 means the computer found the EVAP switching valve, also called the fuel tank isolation valve, stuck or not responding as commanded. Causes include the valve itself, engine computer software on some Fords, loose in-tank vapour connections or overfilling a hybrid tank. It is usually driveable, but have it checked.

On many newer vehicles, and especially sealed-tank hybrids, a valve between the fuel tank and the EVAP canister is opened and closed by the computer. P2450 is set when that valve does not move or seal the way it was commanded.

Ford has bulletins that tie the code to PCM software on 2021-2025 F-150 and 2023-2025 Maverick and Escape, to improperly connected vapour lines inside the tank on 2024-2026 Expedition and Navigator, and on 2020-2025 hybrids to overfilling the tank. Jeep and Chrysler plug-in hybrids use a fuel tank isolation valve bulletin that can also stop the fuel door opening.

Owners of 2015 F-150 trucks report the EVAP blocking valve itself stuck and replaced, so a failed valve is possible, but check bulletins first.

Most likely causes

  1. Fuel tank isolation or EVAP switching valve stuck

    Supported by vehicle data
    Why it ranks here
    Owner complaints on a 2015 F-150 report the EVAP blocking valve stuck and replaced, a 2024 Tundra readout names the code as a stuck switching valve actuator, and Jeep describes it as "fuel tank isolation valve stuck open".
    What would change this
    Rises if the valve does not click or hold when commanded on a scan tool. Falls if it moves normally.
    How to test the evap canister vent valve

  2. Engine computer software that needs an update

    Supported by vehicle data
    Why it ranks here
    Ford bulletins for 2015 F-150 (TSB 18-2387), 2018 F-150 (TSB 18-2252) and 2021-2025 F-150 (TSB 25-2165) tie P2450 to the PCM and its software level.
    What would change this
    Rises if a dealer finds your VIN covered and the PCM not at the latest level. Falls if it is already up to date.
    How to test the engine control module (ecm / pcm)

  3. Tank overfilled on a hybrid

    Supported by vehicle data
    Why it ranks here
    Ford SSM 53601 says that on 2020-2025 hybrids P2450:00 may be caused by the customer overfilling the tank, and tells owners not to top off after the first automatic shut-off.
    What would change this
    Rises if the code appeared right after a fill-up that went past the first shut-off. Falls if the tank was filled normally.

  4. Vapour line connections inside the fuel tank improperly connected

    Supported by vehicle data
    Why it ranks here
    Ford TSB 26-2023 names improperly connected EVAP line connections inside the fuel tank for P2418:72 and/or P2450 on 2024-2026 Expedition and Navigator.
    What would change this
    Rises on a covered vehicle with P2418 stored too. Falls on any other vehicle.

  5. Fuel vapour valve fault on plug-in hybrids (Wrangler 4xe, Pacifica PHEV)

    Supported by vehicle data
    Why it ranks here
    FCA bulletin 14-012-25 pairs P2450 with a fuel door that will not open and has the fuel vapour valve replaced.
    What would change this
    Rises if the fuel door will not release. Falls on a non-hybrid.

What to test first

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

  1. Read all stored codes and freeze-frame data. Note whether P144C, P1450, P0455 or P0456 are stored with P2450.

    Low riskTool: OBD-II scan tool

    • IfP144C is stored too on an F-150

      It meansFord groups them in one bulletin.

      Go to step 2

    • IfP2450 alone or with other EVAP codes

      It meansAsk about bulletins.

      Go to step 2

  2. Ask a dealer whether your VIN has a PCM software update or EVAP bulletin for P2450 (Ford F-150, Escape, Maverick, Expedition, Navigator; Jeep and Chrysler plug-in hybrids).

    Low risk

  3. On a hybrid, think about whether the tank was filled past the first automatic pump shut-off before the light came on.

    Low risk

  4. Command the isolation or switching valve with a bidirectional scan tool and check that it opens, closes and holds.

    Best left to a shopTool: bidirectional scan tool

    Warning:Work on a vented fuel system can release flammable vapour. Let a shop do it.

Symptoms

  • Check engine light with the car otherwise normal
  • Hard to fill the tank, or the pump keeps shutting off (hybrids)
  • Fuel door will not open (plug-in hybrids) Gets more serious: stop and have it checked.
  • Engine cuts out when accelerating after a stop Gets more serious: stop and have it checked.

Compare with: Check engine light came on after getting gas

How to fix

  1. On a hybrid, stop the pump at the first automatic shut-off and do not top off, then see if the code returns after it is cleared.

  2. Ask a dealer whether your VIN has an open PCM software or EVAP bulletin for P2450.

Parts and cost context

  • EVAP canister vent valve:The valve is the nearest listed component for the tank isolation or switching valve; the part and its cost differ by vehicle. Test it before buying, and ask whether a software update comes first. 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

Ford

  • 2015 · F-150

    Supported by vehicle data

    Owners report P2450 with the truck cutting out after a stop and an EVAP blocking valve stuck and replaced; Ford TSB 18-2387 covers early-build 2.7L EcoBoost trucks.

  • 2021–2025 · F-150

    Supported by vehicle data

    Ford TSB 25-2165 ties P2450 to the PCM software level. Whether the bulletin is still current is not verified.

  • 2020–2025 · Escape

    Supported by vehicle data

    Ford SSM 53601 says P2450:00 may be an EVAP concern or caused by overfilling the tank; do not top off after the first shut-off.

  • 2024–2026 · Expedition

    Supported by vehicle data

    Ford TSB 26-2023 ties P2450 to improperly connected EVAP lines inside the fuel tank.

  • TSB 18-2387Status unverified

    MIL on with P2450 (2.7L EcoBoost)

    2015f-150 · NHTSA 10153939

    PCM service procedure for trucks built on or before 5 October 2015.

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

  • TSB 18-2252Status unverified

    MIL on with P2450 and/or P144C

    2018f-150 · NHTSA 10144917

    Service procedure for early-build 2018 F-150.

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

  • TSB 25-2165Status unverified

    MIL on with P2450

    2021–2025f-150 · NHTSA 11018318

    The code may be due to the PCM software level.

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

  • SSM 53601 (ford)Status unverified

    MIL on with P2450:00 on hybrids

    2020–2025escape, explorer, maverick · NHTSA 11017059

    May be an EVAP concern or caused by overfilling the tank; do not top off after the first shut-off.

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

  • TSB 26-2023 (ford)Status unverified

    MIL on with P2418:72 and/or P2450

    2024–2026expedition · NHTSA 11031259

    Improperly connected EVAP line connections inside the fuel tank.

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

Jeep

  • 2023–2025 · Wrangler

    Supported by vehicle data

    FCA bulletin 14-012-25 lists P2450 as fuel tank isolation valve stuck open on the 4xe, sometimes with the fuel door unable to open.

  • 14-012-25 (jeep)Status unverified

    P2450 fuel tank isolation valve stuck open (4xe)

    2023–2025wrangler · NHTSA 11018871

    Replace the fuel vapour valve; customers may be unable to open the fuel door.

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

Toyota

  • 2024 · Tundra

    Supported by vehicle data

    One owner readout names P2450 a switching valve actuator stuck on or open. Complaint signal only; no bulletin.

  • P144COn Ford vehicles, the EVAP purge check valve or vapor ejector path is not performing

    Shares causes Supported by vehicle data

    Ford TSB 18-2252 covers 2018 F-150 trucks that set P2450 and/or P144C.

  • P1450Fuel tank vacuum not bleeding off (Ford, Lincoln, Mazda)

    Same system Supported by vehicle data

    Ford SSM 48301 lists P2450 and P1450 among the EVAP-related codes on hybrid Fusion and C-MAX.

All EVAP (evaporative emissions) codes

P2450 questions

Is P2450 caused by overfilling the gas tank?

On 2020-2025 Ford hybrids, Ford says it can be. Stop at the first automatic pump shut-off and do not top off.

Do I need a new valve for P2450?

Not always. Ford ties the code to PCM software on several trucks and to in-tank vapour connections on some SUVs. Ask about bulletins before buying a valve.

Sources and review

  1. Ford SSM 53601: MIL with P2450:00 (2020-2025 hybrids) — Ford Motor Company / NHTSA
  2. NHTSA complaint ODI 1595700: 2015 Ford F-150, P2450 — NHTSA Office of Defects Investigation (owner complaint)
  3. FCA bulletin 14-012-25: P2450 fuel tank isolation valve stuck open (2023-2025 Wrangler 4xe, 2023-2024 Pacifica PHEV) — Stellantis (FCA) / NHTSA
  4. NHTSA complaint ODI 1689792: 2015 Ford F-150, P2450 — NHTSA Office of Defects Investigation (owner complaint)
  5. NHTSA complaint ODI 2019058: 2024 Toyota Tundra, P2450 — NHTSA Office of Defects Investigation (owner complaint)
  6. Ford TSB 18-2387: MIL with P2450 (2015 F-150 2.7L EcoBoost) — Ford Motor Company / NHTSA
  7. Ford TSB 18-2252: P2450 and/or P144C (2018 F-150) — Ford Motor Company / NHTSA
  8. Ford TSB 25-2165: MIL with P2450 (2021-2025 F-150) — Ford Motor Company / NHTSA
  9. Ford TSB 26-2023: MIL with P2418:72 and/or P2450 (2024-2026 Expedition and Navigator) — Ford Motor Company / NHTSA
  10. EVAP pinpoint test HX may give incorrect results (bulletin SSM 48301) — Ford Motor Company / NHTSA ,
  11. NHTSA complaint ODI 2126879: 2017 Ford F-150 2.7L, P2450 — NHTSA Office of Defects Investigation (owner complaint)
Last reviewed
Written by
Saurabh K.
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