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P0446 Error Code Question

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Old 05-01-2009, 01:57 PM   #1
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P0446 Error Code Question

I have a 99 Tacoma with 3.4L V6. A while back the check engine light came on, so I invested in an OBDII tool to see what was up. It reported an error code of P0446. I ran this by a buddy who is a mechanic and he said to try replacing the gas cap. I did this and cleared the code and everything was fine for a few weeks, then it came back again yesterday with the same code. Has anyone run into this before or have any advice on what might be causing it? Thanks.
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Old 05-01-2009, 03:10 PM   #2
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Welcome to Tacoma World!
FWIW, I dont think your buddy knows what he is looking for.
Sounds like an Emissions Vale issue. Check this out, and see if it helps.
http://ncttora.com/FSM/2000/Repair%2...n/cip0441p.pdf
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Old 05-01-2009, 05:21 PM   #3
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Thanks for the quick reply. Looks like it may be a little over my head. This what happens when you have a "buddy" who's a mechanic I guess...
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Old 05-01-2009, 06:07 PM   #4
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by Colonel Troutman View Post
Thanks for the quick reply. Looks like it may be a little over my head. This what happens when you have a "buddy" who's a mechanic I guess...
It shouldnt be to hard to fix. Identify the location of the part on the truck, and take your time. Its all just nuts and bolts.
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Old 05-01-2009, 07:55 PM   #6
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Thanks again. I used an OEM gas cap and it's on nice and tight. I'll look into the charcoal canister. Sooner or later I just have to tear into it and scrape a knuckle or two. Where exactly is the charcoal canister located? I think the next thing I invest in will be a Chilton's manual.
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Old 05-01-2009, 08:03 PM   #7
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Charcoal canister location: http://www.ncttora.com/fsm/2000/Repa...ntrol/loca.pdf

Online service manuals:http://www.ncttora.com/fsm/index.html
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Old 05-01-2009, 08:16 PM   #8
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Awesome, thanks BeefTaco. Now I have something to do tomorrow!
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Old 09-29-2014, 01:59 PM   #9
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Thread revival! (real question below)

This is the number one thread when I searched "Tacoma P0446" on google...wow...

Ok so on to the problem, since this thread is out there already no need to make another.

I have a '99 3.4L (5VZ FE) that throws the P0446 code on occasion. I'll clear it and won't come back on for a couple days to a week or longer (depending on the driving i'm doing). I see a faster return of the code with in-city stop and go driving, where as longer road trips won't kick the code on at all. There are no other codes that come on with this one at all. This has been ongoing for about 3 months now.

That being said, I replaced the gas cap and tested the VCV (it was within spec). What are my next steps that I should take to put this thing to bed?
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Old 09-29-2014, 02:07 PM   #10
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Quote:
Originally Posted by Tacotime99 View Post
Thread revival! (real question below)


I have a '99 3.4L (5VZ FE) that throws the P0446 code on occasion. I'll clear it and won't come back on for a couple days to a week or longer (depending on the driving i'm doing). I see a faster return of the code with in-city stop and go driving, where as longer road trips won't kick the code on at all. There are no other codes that come on with this one at all. This has been ongoing for about 3 months now.
Just piggy backing off of Tacotime- I'm having the same code and once in a blue moon it throws P0441. I realize it's most likely the charcoal canister, but am mostly wondering what the risk of ignoring it is. Truck runs just fine, the only quirk is I sometimes have a hard time filling the gas tank. The air doesn't escape fast enough as the fuel goes in, so the fuel backs up to the top quickly and kicks the pump off.
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Old 09-30-2014, 08:55 AM   #11
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So mine came on again today after sitting at a stop light. It's been about 8 days since it last came on and most of my driving was highway over the weekend and before.

Can anyone lend some assistance or suggest solutions (taking into account my trouble shooting done already)?
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Old 12-15-2014, 09:41 AM   #12
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Tank Vent Valve

My truck was throwing the Evap codes and I spent some time hunting down the issue, eventually had to use a home made smoke system on it but figured out that the fuel tank vent valve was the cause of the issue (as a result of this is where smoke was coming out of and should not have been)

This is a plastic valve assy that goes from the top of the tank over to the charcoal canister (how the vapors get to the canister). When I was getting parts the dealer told me that the seal will age and crack or the valve, again made of plastic, can break. I have highlighted in the attached with red arrow the part I had to replace.

After dropping the tank I found that there was a hairline crack in the plastic valve housing, which was creating the leak. While I had the tank out I replaced the seal and hoses associated with this valve. Total in parts will run ~100-150 depending on if you go dealer or online purchases, this included the hoses and seals which probably were fine, however if I am dropping the tank spending an extra 30 bucks to not have to do it again is worthwhile to me.

Just wanted to post what I had found and it has successfully fixed my truck. Likely would not have found this without smoking the system as could not see the crack in the valve until it was removed from the gas tank, but found the problem quickly and allowed for a one time effort to fix the issue.
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