P0441 EVAP purge flow incorrect

EVAP incorrect purge flow

Monitor

EVAP faults let fuel vapour escape but rarely change how the car drives, and the main risk is a failed emissions test, so it is safe to drive while you arrange a fix.

It gets more serious if:

  • Inspect soon: You keep smelling raw fuel around the car, not just right after filling up
  • Stop: You see liquid fuel dripping or pooling under the car, or near the filler, tank or canister

Source: how we rate severity

P0441 in short

P0441 means the computer did not see the expected flow of fuel vapour from the charcoal canister into the engine. The purge valve or its hoses are almost always to blame, usually a valve that sticks or does not open. It is generally safe to drive unless you smell or see fuel.

The purge valve opens to let the engine draw stored fuel vapour out of the canister and burn it. The computer opens the valve and watches for the effect, such as a change in fuel tank pressure.

If it sees too little effect, or flow when it should be closed, it sets P0441. Nissan sums it up: the valve is either open when it should not be or not open when it should be.

P0496 is the related code for flow when the purge valve should be closed. P0443 is the electrical code for the same valve.

Most likely causes

  1. Purge valve sticking or not opening

    Common general cause
    Why it ranks here
    Nissan says the valve or its hoses are almost always the culprit, and Honda has a bulletin for purge valves that stick now and then.
    What would change this
    Rises if no vacuum passes when the valve is commanded open while the supply vacuum is good.
    How to test the evap canister purge valve

  2. Cracked, blocked or disconnected purge hose

    Common general cause
    Why it ranks here
    With no vacuum reaching the valve, there can be no purge flow.
    What would change this
    Rises if a hose is off or split, or there is no vacuum at the valve inlet.
    How to test the vacuum hoses and intake leaks

  3. Purge valve stuck open

    Possible — needs testing
    Why it ranks here
    A valve stuck open upsets the flow check too, though this more often sets P0496.
    What would change this
    Rises if vacuum passes with the valve commanded closed.
    How to test the evap canister purge valve

  4. False reading from leak detection pump tolerance (some 2012–2013 VWs)

    Supported by vehicle data
    Why it ranks here
    VW has a bulletin for a false P0441 from leak detection pump tolerance on specific models.
    What would change this
    Only applies to the VW models listed in bulletin 01 12 33.

  5. Canister restricted or shedding charcoal

    Possible — needs testing
    Why it ranks here
    A saturated canister can restrict flow and shed charcoal that damages valves.
    What would change this
    Rises if the canister is heavy or charcoal is found in the hoses.
    How to test the evap charcoal canister

  6. Fuel tank pressure sensor reading wrong

    Possible — needs testing
    Why it ranks here
    Some systems judge purge flow by tank pressure, so a bad sensor can fake a flow fault.
    What would change this
    Rises if the tank pressure reading does not move when you apply slight vacuum or pressure.
    How to test the fuel tank pressure sensor

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, check the purge hoses between the canister line, the purge valve and the intake for splits, kinks or loose ends.

    Use cautionTool: flashlight

    Warning:Let the engine cool first. Parts in the engine bay can be hot enough to burn, and fuel vapour is flammable, so keep sparks and flames away.

  2. With the engine idling, put a vacuum gauge on the canister side of the purge valve and command the valve off, then on, with a scan tool.

    Best left to a shopTool: scan tool with output controls, vacuum gauge

    Warning:Engine running: keep hands, hair and loose clothing away from belts and the fan.

  3. Check for engine vacuum at the purge valve inlet with the engine idling.

    Best left to a shopTool: vacuum gauge

    Warning:Engine running: keep clear of belts and the fan.

  4. Watch the fuel tank pressure reading on a scan tool while a shop applies slight vacuum or a small puff of air to the system.

    Best left to a shopTool: scan tool with live data

    Warning:Shop test on the fuel vapour system.

Symptoms

  • Check engine light on, usually with no change in how the car drives
  • Fails an emissions or smog test because of the light or an incomplete EVAP monitor
  • Persistent raw fuel smell around the car Gets more serious: stop and have it checked.
  • Liquid fuel dripping under the car Gets more serious: stop and have it checked.

How to fix

  1. Check the purge hoses in the engine bay are attached and not split.

    Warning:Engine off and cool.

  2. Stop filling once the pump clicks off the first time, so the canister does not flood.

  3. After a repair, drive normally for several days so the monitor can re-run. Clearing codes or disconnecting the battery resets readiness, so do it shortly before an inspection only if you then complete a drive cycle.

Parts and cost context

  • EVAP canister purge valve:Usually in the engine bay, on a hose between the canister line and the intake. Labour varies, so get a quote.
  • EVAP charcoal canister:If charcoal has reached the purge valve, the canister may need replacing too, or the new valve can fail again.

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

Compare used part prices on PartPriceGuide

On your vehicle

Honda

  • 2019–2024

    Supported by vehicle data

    Honda bulletin 23-091 covers the 2019–2024 Odyssey, 2019–2022 Pilot, 2019–2023 Ridgeline and 2019–2023 Passport. Spring variation can make the purge control solenoid valve stick now and then, setting P0441. Replace the solenoid and run the EVAP function test. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • 23-091Status unverified

    P0441 from an intermittently sticking purge control solenoid valve

    2019–2024odyssey, pilot, ridgeline, passport · issued · NHTSA MC-10247623

    Spring variation in the purge control solenoid valve can make it stick now and then. Replace the solenoid with the updated part and run the EVAP function test.

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

Volkswagen

  • 2009–2017

    Supported by vehicle data

    VW bulletin 20 17 02 lists P0441 among the codes where the N80 purge valve may be involved on 2009–2017 gasoline models (except Routan). It says to smoke test and check vacuum before replacing the valve. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:N80 purge valve, engine bay

  • 2012–2013

    Supported by vehicle data

    VW bulletin 01 12 33 covers a false P0441 from leak detection pump tolerance on the Passat 2.5L and the Beetle and Jetta 2.5L/2.0T. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • 01 12 33Status unverified

    P0441 false reading from leak detection pump tolerance

    2012–2013passat, beetle, jetta · issued

    Production tolerance in the leak detection pump can produce a false P0441 on 2012–2013 Passat 2.5L and Beetle and Jetta 2.5L/2.0T. The bulletin gives the dealer repair.

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

  • 20 17 02Status unverified

    EVAP purge valve (N80) diagnosis

    2009–2017 · issued · NHTSA MC-10125657

    For 2009–2017 gasoline Volkswagens (except Routan), lists the EVAP codes that can involve the N80 purge valve and says to smoke test the system and check vacuum before replacing the valve.

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

  • P0496EVAP purge flow when purge should be off

    Same system Common general cause

    Opposite faults on the same valve. P0441 is usually too little flow, P0496 flow when the valve should be closed.

  • P0443EVAP purge valve circuit fault

    Same system Common general cause

    P0443 is the electrical fault on the same purge valve. If both are stored, fix the circuit first.

All EVAP (evaporative emissions) codes

P0441 questions

Is P0441 always the purge valve?

Not always, but most of the time it is the valve or its hoses. Check the hoses for splits first, then test whether the valve opens and closes on command before replacing it.

Why does the code keep coming back after a new purge valve?

A canister shedding charcoal can damage the new valve, and an intermittent sticking valve may pass a quick test. Some makers, such as Honda, have bulletins for valves that stick only now and then.

Is it safe to keep driving?

Usually yes, as long as there is no strong fuel smell and no fuel dripping. Most makers advise getting it fixed when it is convenient. A strong fuel smell means get it checked soon, and dripping fuel means stop and do not drive.

Will this code fail an emissions inspection?

In states that test OBD-II, a check engine light that stays on with the engine running fails the test. Clearing the code does not help straight away, because the EVAP monitor then reads not ready until the car completes a drive cycle.

Sources and review

  1. Frequently Asked Questions on On-Board Diagnostics (EPA 420-F-97-003) — US EPA ,
  2. On-Board Diagnostic II (OBD II) Systems Fact Sheet — California Air Resources Board ,
  3. EVAP: The Phantom Emissions Menace (Nissan TechNews, May 2018) — Nissan North America (hosted by AutomotiveTechInfo) ,
  4. OBD Test Reference (rev 8.6) — California Bureau of Automotive Repair ,
  5. What do you mean my car is not ready? — New York State DMV
  6. Recall acknowledgement 17V-088: BMW i3 REx fuel tank vent line may chafe — BMW of North America / NHTSA
  7. Part 573 Safety Recall Report 15V-621 (Mazda 8615J): liquid fuel can enter the EVAP canister — Mazda North American Operations / NHTSA
  8. Honda 23-091: P0441 from an intermittently sticking purge control solenoid valve — American Honda / NHTSA ,
  9. VW 20 17 02: EVAP purge valve (N80) diagnosis — Volkswagen of America / NHTSA ,
  10. VW 01 12 33: P0441 false reading from leak detection pump tolerance — Volkswagen of America / NHTSA ,
  11. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  12. Land Rover SSM 74799: P0496 logged — Jaguar Land Rover North America / NHTSA ,
Last reviewed
Written by
Saurabh K.
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