Fault code P0444?? - Rennlist - Porsche Discussion Forums



Fault code P0444??

Reply
 
Thread Tools Search this Thread
Old 03-07-2017, 11:34 PM   #1
powdrhound
Addict
Rennlist Member
Thread Starter
 
powdrhound's Avatar
 
Join Date: Dec 2010
Posts: 2,657
Default Fault code P0444??

For the first time in 6 years of owning this car, I got a CEL. I noticed it this weekend at the track but can't recall when in popped up. I'm curious if any of the technical types on the forum here have any experience with this. I scanned it with durametric and pulled up the code P0444: Porsche fault code 98 - tank vent valve. This seems to be the culprit as all the emission readiness codes are set to PASS and there is nothing else of note. You can ignore the the CAN time out PSM as that is normal since the whole PSM system has been removed from the car years ago when the Cup ABS system was installed.

I did a little bit of google work on this and it seems this MAY be the valve that opens then the fuel nozzle is inserted into the filler neck and allows fuel vapors to be diverted to the charcoal canister during fueling. In PET it's referred to as a "bleeder valve" part # 996.201.143.01. I do however hear the clicking noise when the flapper in the neck is pushed in which indicates that the valve seems to be working, but what do I know? I spoke with another Porsche mechanic and he said this error code may be referring to some valve on the engine. I'm not sure about that however. Any ideas from the pros here would be appreciated..

[url=https://flic.kr/p/RtuyHQ]


powdrhound is offline   Reply With Quote
Old 03-07-2017, 11:39 PM   #2
TT Surgeon
Addict
Rennlist Member
 
TT Surgeon's Avatar
 
Join Date: Oct 2004
Location: KC ex pat marooned in NY
Posts: 12,462
Default

My '03 c4s dropped that code once, I think it was that canister vent valve.
TT Surgeon is offline   Reply With Quote
Old 03-08-2017, 10:07 AM   #3
Kevinmacd
Addict
Rennlist Member
 
Join Date: Nov 2010
Location: SE Florida
Posts: 2,364
Default

I have noticed not so much on the Pcar, but if you overfill other cars it seems to kick off a code due to fuel backing into the canister. Run it awhile reset and see if it goes away.
Kevinmacd is offline   Reply With Quote
Old 03-08-2017, 10:08 AM   #4
Carlo_Carrera
2011 Rennlist F1 Champion
Rennlist Member
 
Carlo_Carrera's Avatar
 
Join Date: Feb 2010
Location: Nearby
Posts: 2,916
Default

Also check your fuses. If I remember correctly sometimes a blown fuse can cause this error code.
Carlo_Carrera is offline   Reply With Quote
Old 03-08-2017, 06:14 PM   #5
ReidN
User
 
ReidN's Avatar
 
Join Date: Sep 2006
Location: Elgin, IL.
Posts: 558
Default

OK had this exact one. For me it was the plastic housing around the gas fill cap under the inner fender liner. Took 2 trys and a smoke machine to figure it out. One of the small vacuum lines attaches to a plastic barb. The barb had a hairline crack. When we saw the smoke, which took a while to show up. We touched the barb and it broke off. This is actually a common place for this to occur I have found out. Let me know what you find out. Cheers
ReidN is offline   Reply With Quote
Old 03-08-2017, 07:09 PM   #6
powdrhound
Addict
Rennlist Member
Thread Starter
 
powdrhound's Avatar
 
Join Date: Dec 2010
Posts: 2,657
Default

Thanks for the input guys. I just cleared the code with the engine off. Once the car was started the same P0444 reappeared but the CEL did not. I let the car idle for about 30 minutes and it finally dinged and the CEL came back. I cleared it again and the CEL did not come back but I'm sure it will once the car is driven. I've checked the E6 fuse but it's ok. I figured it would be since I could hear the vent valve click when I depressed the filler neck flapper valve. I'm starting to lean to the idea listed above by ReidN, there has to be a leak somewhere in the lines or the vent valve itself. I'll investigate further tomorrow.

Initially I though this may have something to do with the sea level altitude the car was run at this past weekend as it normally lives at 5200'+. I had a low fuel pressure alarm when I started the car at COTA which turned out was caused by the higher vacuum created at sea level compared to 5200' thus pulling idle pressure down. My static fuel idle fuel pressure is 3.2 bar but at COTA it dipped to 2.9. A simple increase of idle fuel pump output fixed this. This led me to think that maybe altitude had something to do with the P0444 also but that's not the case.
powdrhound is offline   Reply With Quote
Old 03-12-2017, 04:13 PM   #7
Macster
Addict
Rennlist Member
 
Join Date: Sep 2006
Location: Livermore, CA
Posts: 16,516
Default

Maybe this will be of some help?
Attached Images
File Type: pdf P0444.pdf (27.7 KB, 46 views)
Macster is offline   Reply With Quote
Old 03-12-2017, 04:34 PM   #8
powdrhound
Addict
Rennlist Member
Thread Starter
 
powdrhound's Avatar
 
Join Date: Dec 2010
Posts: 2,657
Default

Thanks Macster! I wonder why the fault code reads "tank vent valve" instead of the canister purge valve like in the maintenance document.
powdrhound is offline   Reply With Quote
Old 03-12-2017, 06:11 PM   #9
garrett376
C4 Specialist
Rennlist Member
 
Join Date: Oct 2003
Posts: 5,055
Default

Quote:
Originally Posted by powdrhound View Post
Thanks Macster! I wonder why the fault code reads "tank vent valve" instead of the canister purge valve like in the maintenance document.
Isn't that Durametric's version/interpretation of the code? They likely mislabeled its actual meaning.
garrett376 is offline   Reply With Quote
Old 03-15-2017, 09:17 PM   #10
powdrhound
Addict
Rennlist Member
Thread Starter
 
powdrhound's Avatar
 
Join Date: Dec 2010
Posts: 2,657
Default

Macster, do you know where exactly the "EVAP canister purge valve" is located and the part number for it? I'm thinking it might be 996.605.123.01 (attached to the secondary air pump bracket) but it's not very clear in PET or the maintenance manual link you provided for the trouble shooting of code P0444. It's either right near the EVAP canister (front right wheel well) or more likely on the engine near the intake somewhere. Any guidance or pics would be appreciated.

I found a picture (see link below) of what is supposed to be the EVAP purge valve but it looks like it's pointing to the N75 boost control frequency valve (996.605.155.00) instead. Obviously that is wrong.

https://www.renntech.org/forums/topi...r-purge-valve/

Thanks!

Last edited by powdrhound; 03-15-2017 at 09:55 PM.
powdrhound is offline   Reply With Quote
Old 03-16-2017, 08:07 PM   #11
Kevinmacd
Addict
Rennlist Member
 
Join Date: Nov 2010
Location: SE Florida
Posts: 2,364
Default

This may help, i know its 4cs might be close to the same location.

https://www.renntech.org/forums/topi...evap-canister/

Last edited by Kevinmacd; 03-16-2017 at 08:24 PM.
Kevinmacd is offline   Reply With Quote
Old 03-18-2017, 03:11 PM   #12
Macster
Addict
Rennlist Member
 
Join Date: Sep 2006
Location: Livermore, CA
Posts: 16,516
Default

Quote:
Originally Posted by powdrhound View Post
Macster, do you know where exactly the "EVAP canister purge valve" is located and the part number for it? I'm thinking it might be 996.605.123.01 (attached to the secondary air pump bracket) but it's not very clear in PET or the maintenance manual link you provided for the trouble shooting of code P0444. It's either right near the EVAP canister (front right wheel well) or more likely on the engine near the intake somewhere. Any guidance or pics would be appreciated.

I found a picture (see link below) of what is supposed to be the EVAP purge valve but it looks like it's pointing to the N75 boost control frequency valve (996.605.155.00) instead. Obviously that is wrong.

https://www.renntech.org/forums/topi...r-purge-valve/

Thanks!
Not sure where it is. My Turbo references have no drawing diagram.

But visit this link:

http://www.autoatlanta.com/porsche-p..._911_parts.php

Click on the Carbon Canister page and I think that wil show you where the part is located and its part #.
Macster is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
991.2 gts graphite blue roadtrip okroger 991 21 07-07-2017 03:35 AM
Full body clear bra, paint correction, coatings and more on a GT3...oh my... Detailed Designs 991 GT3 GT3RS and 911R 73 05-29-2017 01:55 PM
Check valve #16 question.... powdrhound 996 Turbo Forum 11 05-17-2017 02:29 AM
New Look for my 997TT. Lowered + HRE's Nelson999 997 Turbo Forum 24 04-22-2017 07:15 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 01:42 AM.


Copyright ę 1998 - 2017 Rennlist.com
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: