P0446 Explained - EVAP Emission Control System Vent Control Circuit Malfunction (Simple Fix)

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The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video, we explain what OBD2 code P0446 means and possible causes.
P0446 means there is an evaporative emission control system vent control circuit malfunction.
The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module (ECM) and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve. Both the vent control valve and the purge valve are usually open when the engine is at normal operating temperature.
However, the ECM occasionally performs leak tests to ensure the evaporative emission control system is working properly. During the leak test, the ECM closes the vent control valve and purge valve to create a vacuum.
When P0446 is triggered, the ECM has detected a short in the circuitry to activate the vent control valve, or the EVAP system failed to maintain the vacuum during the active EVAP leak test.
Want to learn more? Check out our blog ➡️ www.fixdapp.com/blog/p0446
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0:00 P0446 - Evaporative Emission Control (EVAP) System Vent Control Circuit Malfunction
0:24 What is the EVAP System?
1:00 P0446 is Caused When There is a Small Leak or Short Circuit in the EVAP System
1:13 Possible P0446 Causes When Paired with P0440 or P0441
1:42 Possible P0446 Cause - Gas Cap
1:44 Possible Simple Fix for P0446 - Inspect Gas Cap
2:40 Possible P0446 Cause - EVAP Hoses
2:50 Possible P0446 Cause - Fuel Tank and Charcoal Canister
2:58 Possible P0446 Cause - Vent Control Valve
3:10 Visit our blog to learn more about P0446
3:34 Happy Driving!
#FIXD #P0446 #checkenginelight

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9 июл 2024

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Комментарии : 122

@callaedwards9184 5 лет назад

Super helpful! This made the error code on my dash go away.

@fixdapp 5 лет назад

Glad to hear it!

@Victorgutierrez-bl5yl 4 года назад

what was the problem

@brayancortez3212 Год назад

“WHAT WAS THE REASON!” Cardi B

@davdjimenez1150 5 лет назад

Super informative and helpful really helped me pin point witch areas i should specifically be looking for.

@alfries9736 3 года назад

I recently bought gas here in N.J. Where we are not allowed to pump our own gas... The check engine light came on on my truck. I have a code reader and this is what came up. After watching this video I went outside to find my cap was not even really on... Thanks a lot for the tip !!! I cleared the code and it has not come back.

@jasonvigeant8893 3 года назад

Great video.. helped so much! Exactly what I needed!

@MtnBadger 2 года назад

The other possible contributor is the purge valve by the intake that can be malfunctioning. Because my 02 kia Sedona has 186k miles and is giving the 0446 code, I have replaced the evap valve and filter, which are cheap (it's the labor that eats you alive), checked the cap and the purge valve, all are replaced or working properly. There's no apparent hose damage and no leak codes, just the 446. The next probable cause is a blockage in a hose oe the canister itself. Either a smoke test or blowing low-pressure air from a compressor or air pig (those portable air tanks are called "pigs") through the hoses. If air comes through the hoses, they don't leak and the other components are okay, it must be a clog in the canister. Perseverance and some labor will eventually pay off, there's only so many things it can be, just go one step at a time.

@tnpassionstudio7178 4 года назад

What an awesome video ! Very short and very informative

@fixdapp 4 года назад

Glad you liked it!

@jwall70 Год назад

Just had this code, watched this video, tightent the gas cat problem solved, thanks for the video 👍

@rockyv.2249 3 года назад

Great stuff thanks!

@UPRR-nq6uj 4 года назад

Awesome job...subscribed

@shadowcross7248 3 года назад

So I'm getting 3 codes. PO440, PO446, and PO441. Have a 2001 Chevy Prizm. This the only thing my check engine light comes on for. What can I check first to never get these codes again. ?

@eloymartiz8349 3 года назад

2006 taurus 3.0l PO446 code no power to the canister? WHERE START TO CHECK?

@mohammadasif6521 2 года назад

I have Denali 2010 when I open fuel cap that car shut off its self quickly please tell me about this problem thanks

@MiyushuBabii 4 года назад

Thank you.... great peace of mind.

@olusesanfesobi5219 2 года назад

Can a bad Fuel EVAP lead to reduce gas mileage. I seem to have lost about 60 miles on every tank refill I did since 2019

@ase06090 Год назад

I just replaced the purge valve solenoid on my 99 Corolla and it cleared my code P0441.

@noisycricket8924 2 месяца назад

Thank you 🙏

@user-fz7pd5ue8e 6 месяцев назад

Been puzzled for 2 months now with my 2010 ford escape had a 440 and 446. Changed some parts but still have a 446. A chug while fueling. At random, especially when climbing hills. Idol is good, i can use my gas peddle and get it going good again. I don’t know what part to fix.

@nazigrammar9728 5 лет назад

got that code after sending unit replacement: few weeks after I double checked - everything on its place. The code still coming on after 20-30 miles after I cleared. I think there's a problem with a sending unit o-ring(the big one on a top of a fuel tank) because I had no code before - anyway I put a new o-ring in a fuel neck cap - nothing changed. How dangerous to drive as is? Camaro 2000

@parshasanjana25 4 года назад

Thanks bro

@fixdapp 4 года назад

No problem!

@donnametcalf777 Месяц назад

My problem seems to be an animal, chewed the electrical wire on the EVAP system. Should I take it to a Ford dealer?

@elizabethalmaraz3061 3 года назад

@mydarkwolfchannel4988 Год назад

Is this problem be the reason my car stop running?

@daviddowns7552 Год назад

one guy said,,, po446 code,,is never fixed with a purge valve. canister ect. ? he said to remove valve and blow air pressure thru while tapping to remove debris?? i cant belive this? so he says clean it but a new one wont fix it. ahhh. sounds stupid. if its bad a purge valve is what it needs i thought? weird. any suggestions on po446. im really upset hearing this cause im tired of working on this car. what a strange answer.

@el_moreno2865 3 года назад

So I have code p0446 I replaced canister and the hoses weren’t ripped. It’s not letting my Ford Focus start. I turn key start the car and it just shakes and the engine won’t let me accelerate. I keep getting code p0446 what do I do

@rkgsd 2 года назад

The charcoal canister has nothing to do with not starting.

@RhythmBlade 4 года назад

My p0446 code is paired with p0455 and I cant find anything anywhere with what it means when they are paired. Please help

@LaDeeDah 4 года назад

I have both codes as well

@RhythmBlade 4 года назад

@@LaDeeDah I found my problem. It's your evap line, you gotta get that replaced and then see if your fuel line is leaking. But, you have to get your car smoke tested first to see if theres holes anywhere. Go to your local auto shop and schedule a smoke test

@ednja 2 года назад

Could the P0446 code happen if the vehicle hasn't been started for 2 or 3 years?

@mydarkwolfchannel4988 Год назад

I have that problem but my car won’t start

@mikeyriley8959 4 года назад

I have both P0441 and P0446. Changed the gas cap, new charcoal box, purge valve, EGR valve and relay, and vacuum solenoid valve. All OEM parts. Cleaned throttle body and air intake control valve. Still get both codes. Hoses in good condition. What now?

@mistercool3859 4 года назад

I have both codes, too. Did you figure out the issue?

@mohamedalrawahi1016 4 года назад

You need yo reset the car

@anishgeorge 4 года назад

Go to charcoal canister and remove the hose from gas tank to canister use a wet vacuum to suck any gas left in hose and at canister. Mine was a little gas left in the hose and canister blocked due to overfilling. Good after I did vacuum .can use little bleeding pump also to suck gas if left in hose and clear block in canister

@mikeyriley8959 4 года назад

Anish George I got rid of the lemon. Now I. Own an ES330

@johnmcminn9455 2 года назад

@@anishgeorge that is the best solution i have heard . This also explains why over filling is bad

@michaelmiller7162 5 месяцев назад

What if i don’t have a gas cap on my 2019 Chevy

@beautifulaether 2 года назад

I am so glad you made this product! Thank you so much for everything! John 3:16 / John 3:3-5 / Revelation 21

@fixdapp 2 года назад

Thank you so much for the kind words and using FIXD! 😊 We would love to know, what’s your favorite FIXD feature?

@beautifulaether 2 года назад

@@fixdapp I like the design, and how you can tap the icon and it scans your vehicle of course. I also like how it explains the diagnostic codes, how you can input your mileage, and it shows when to replace parts and do preventative maintenance.

@sweetjustice8141 Год назад

Can you do a video on P0447?

@SLiveForTheMoment Год назад

I have p0448 for 2 years unable to be fix

@marcoa.betancourt1469 4 года назад

What if I have P0446 and when I try to fuel the pump keeps shooting off?

@infiernosaxx2548 4 года назад

Did you ever find out a fix? Because, I have the same issue.

@r0ckymountainhi 4 года назад

That means either your charcoal canister is clogged from overfilling, or your vent valve is either stuck closed, or the vent valve solenoid is bad. Try testing your vent valve solenoid first.

@OriginalBabyBoi 4 года назад

r0ckymountainhi how do you test that?

@Joeydoesmedicine 4 года назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-B7EcWwlhzBM.html I shot air through the hose referred to in this video and that’s how I fixed this particular issue

@Amp661 3 года назад

@@r0ckymountainhi if solenoid is replaced next to the fuel tank. How do you check the vent valve itself?

@pedroguzman4958 3 года назад

On my card I had the code by itself.. I bought a new gas cap erased the code drove round like always and no code. It was a 2001 suburban with 5.3.

@mylifethaidiy7045 Год назад

Same here. Now after 2 years the code has returned

@Matt-bp2zu 3 года назад

Why don't you have 10 billion subscribers? Great channel!

@fixdapp 3 года назад

Thank you for the kind words, Matt! We really appreciate it :)

@Matt-bp2zu Год назад

@@ibrahimabdulazim8257 no sh#t, it was an exaggeration, wasn't literal

@82frankthatank 3 года назад

Hi guys I have this code popping up for a lil while p0446 but now my truck won't start, any help will be much appreciated

@mydarkwolfchannel4988 Год назад

How did you fix it

@ricokya915 6 месяцев назад

Update?

@Pjwilliamson55 Год назад

What about PO449 code?

@stevenwing472 Год назад

All I had to do to get rid of mine. Was pull o ring off gas cap. And clean it along with where it makes contact. On tank. No more problem

@skyrob6505 3 года назад

I really need to hurry up and get a few of these hmm maybe I'll get at least 50 of them

@user-fz7pd5ue8e 6 месяцев назад

My 2010 ford escape doesn’t have a gas cap

@tomcabrera8223 2 месяца назад

Same here. Repl evap canister last year now code returned. Cleared code and wait and see.

@olusesanfesobi5219 2 года назад

Can fuel EVAP problem lead to reduced gas mileage. I seem to be losing 60 miles on every tank refill I did since 2019. Now that's really significant over a long period of time

@daviddowns7552 Год назад

yes it sure will burn more fuel. and ive noticed a slight drop in performance.possible hard starting issue also. if valve is bad and remains closed the ecm wll read as lean and try to correct with richer mixture and burns more gas i read. they are annoying!!!!!!!

@FjarilGoddess 10 месяцев назад

@daviddowns7552 Thank you, this really helped confirm my magically disappearing gas and mileage

@jenniemariehastings1760 Год назад

Just purchased Mitsubishi Raider 4dr truck 2007, so within days of $4,000 purchase lights all kinds of lights popped up , like ABS, LIGHTS ON - BRAKE LIGHT ON , CHECK ENGINE ON , so im excited fo purchase code scan ...

@surgickalstrike 6 месяцев назад

Did you fix the problems with the Mitsubishi?

@luispichardo9622 3 года назад

Hi! I replaced the fuel cap, charcoal canister, vent control valve, solenoid valve... pretty much everything on the evap system has been replaced so I am still getting the same code p0446 by itself. Please help! I don’t know what else could be. Thanks!

@thebaker7 3 года назад

Try clearing the code manually

@dmo848 3 года назад

Clog maybe

@luispichardo9622 3 года назад

I tried clearing the code and it was not clogged either. I thought it was clogged as I found dirt in the old canister. Turns out it was the fuel sending unit! Now I have another issue… p0300! As per the scanner it could be a misfiring cylinder but the light goes off once I park and start driving again. Thanks guys for your help!

@sapphirejan2040 3 года назад

Luckily I have a whole year to figure this out. And to replace my O2 sensor. I don't need to pass emissions until 10/21

@Amp661 3 года назад

I have the same code. Have any of you guys fixed your problem?

@Franksinatra96 2 года назад

Now you have 3months left

@thefolks5199 Год назад

Currently having this issue with my 06 Impala and it’s giving me HELL trying to find someone to diagnose and fix the issue just so I can pass the emissions test.

@kennieb5606 2 года назад

ITS NOT THE GAS CAP

@TreadMotorsports Год назад

It's never the gas cap 😭

@daviddowns7552 Год назад

i have a new stant gas cap,, its in perfect condition. cant be cap.

@noah9k 5 месяцев назад

Gotta try it, cheapest fix … but nope

@rickychavez6433 11 месяцев назад

Hi i have Toyota corolla 2000 p0440 and p0446

@warp3725 8 месяцев назад

Simple fix yea right

@user-qb9zx2cs6w 4 года назад

ياصديق معلوم عربي

@strategicservices9906 3 года назад

446 goes away for 2 months then returns???

@nightruler666 3 года назад

Check your gas cap

@nickhyslop5743 14 дней назад

You forgot the the fuel tank pressure switch.

@chevybigblock3311 3 года назад

So just replace one part at a time until the code goes away great diagnostic skills 👍

@fsimoesjr 4 года назад

Unfortunately I can't click a 1000 likes. Thanks a lot.

@pitbullisaac 3 года назад

I just got the p0446 I owed up the gas cap and a bunch of pressure came out . Any clues what that could be?

@matthewe4389 3 года назад

Pressure coming outta the gas tank?

@pitbullisaac 3 года назад

@@matthewe4389 yeah

@dmo848 3 года назад

@S. C. Fuel pressure sensor

@rkgsd 2 года назад

@S. C. Pressure release is what you want to hear when the gas cap is being removed. Not sure what extreme pressure means in your situation.

@mwood1164 Год назад

Your canister is saturated or vent is plugged up

@eds.877 3 года назад

Replaced gas cap, and vent solenoid and purge valve on 2002 grand prix. Cleared code and still coming back. Lost now.

@eds.877 3 года назад

I ended up replacing the sensor on top of the tank and code so far hasn't come back. It must have been bad.

@eds.877 3 года назад

@Max LaSalle Replaced gas cap, and vent solenoid and purge valve first. Charcoal canisters don't fail often from what I have learned.

@eds.877 3 года назад

@ιτζ_rθςκ ™ No, it hasn't come back.

@surgickalstrike 6 месяцев назад

Sending unit? Did you have to drop the tank?

@eds.877 6 месяцев назад

@@surgickalstrike I had to remove the lower cushion of the back seat and a metel cover plate to get to the top of the fuel tank. The sensor I had to replace wasn't the sending unit. It was the fuel tank vapor pressure sensor. It mounts on top of the tank and pushes through a rubber grommet on top of the tank.

@submit2520 4 года назад

So my gas cap can throw a code? Say sike

@2ndgencadi189 4 года назад

lol

@stevenwillis6687 3 года назад

Your gas cap can throw a code

@2ndgencadi189 3 года назад

Yep fixed my check engine blight in my 2004 Cadillac Escalade

@Hizenbird 3 года назад

To be more accurate, your gas cap can CAUSE a code to be thrown. Just like a small hole can CAUSE your gasoline light to come on.

@daviddowns7552 Год назад

looks like im skrewed with po446. it came on one night after i went out of town. autozone read code po446 and i have a print out. i have a new stant gas cap in perfect condition. im sick of this car,its been so much trouble. ok. i bought a new purge valve,solenoid thinking it will fix it but one guy said a new valve will never fix code po446. wth. he said to use air pressure to clean it out. ? i just dont understand but i wanna just blow the car up now cause i try to take care of it but now this crap,, unfixable.🥶

@mattfanslow Год назад

Gas caps do not cause P0446. P0446 is an SAE DTC and the criteria, while wide, doesn't include leaks. The DTC sets, often along with manufacturer-specific DTCs, when the control module (ECM/PCM/VCM/DME/ME, etc) doesn't see circuit level change with release or actuation of the driver as well as a reasonable rate of pressure/vacuum decay when the vent is commanded open (N/C). Education clients is helpful to all, but this makes honest repair shops/technicians look shady when we need time to diagnose, versus just tightening the gas caps and blowing codes out for free. You know, the client saw a video by FIXD, and why would FIXD mislead them. They just have a product to sell and part of the marketing is to demonize small businesses that require happy, repeat customers and can't afford to mislead them; yet somehow that is the message most buy into.

@pov2617 Год назад

p0440 ,p0446?

@GibsonGuitarPlayer27 4 года назад

I have a 2003 Toyota Corolla and its giving only the P0446 code. I replaced the gas cap and this worked for a few weeks, then the code came back. I took it to the dealer and they said that they ran a smoke test and said that the problem is a leak in the fuel filler tube and would cost $440 to replace. I really don't trust any car dealership; could this really be the problem?

@Joey-jq2ti 4 года назад

GibsonGuitarPlayer27 never go to a dealership. I have a 2017 Ford Fiesta se hatchback and my fuel canister purge valve is stuck open and it doesn’t want to start every time after I fill it up with gas no matter how much I put in it. The part itself is $45 but I need the hoses for it and the ones on the messed up one are heat shrink wrapped to the sensor. I called the ford parts department and they couldn’t even find the sensor itself in their system and told me to go to the servic shop. I’m not about to pay them hundreds of dollars for a quick 5-10 minute job maybe less. But I got a 98 corolla as well that I bought off a friend I worked with. It’s in decent condition normal wear and tear on the head liner and steering wheel and a dent where a deer ran into it. It has the po446 code and I asked the man about it and he said nothings wrong with it, it just doesn’t want to come off. I’m hoping just buying a new gas cap and cleaning out the surrounding area works for me because I use it for deliveries and the inspections needed to be done on 3/20 lol. I had a cop behind me one time at a gate and she sat behind me for a while because the customer wouldn’t answer me to get the code and she came out and let me in and told me since I’m a delivery driver she’s just letting me know I gotta fix it and if she sees me another week with it she’ll give me a ticket