Click here to visit LS1Tech
Click here to visit Performance Trucks
Click here to visit Mod Motor Tech
Click here to visit Modern Hemi

PerformanceTrucks.net Forums  

Go Back   PerformanceTrucks.net Forums > GENERAL MOTORS SPECIFIC FORUMS > Tuning, Diagnostics, Electronics, and Wiring
Sign in using an external account
Register Forgot Password?

Welcome to Performance Trucks!
Welcome to Performance Trucks,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 05-19-2010, 06:48 PM   #1
Trader Rating: 0
Teching In
 
Join Date: Apr 2005
Location: conroe
Posts: 23
Default Po449 code

2005 chevy throwing po449 code, what is causing this
hammer71 is offline   Reply With Quote
Old 05-19-2010, 09:02 PM   #2
Trader Rating: 19
PT's Slowest Truck

 
budhayes3's Avatar
 
Join Date: Apr 2004
Location: Hackensack, NJ
Posts: 17,872
Default

There is a TSB about this code, you need to replace the vent solenoid and run a hose off of it up the transmission tunnel to keep dirt and debris from getting in the evap vent solenoid and clogging it up. If you went to the dealer and asked for the kit for the evap vent solenoid they'll probably know what you're talking about...or type P0449 in the search box of the GM section and you'll find a few threads about it, and maybe even part numbers and the TSB
__________________
Billy
[SIGPIC][/SIGPIC]
[URL=http://www.cardomain.com/memberpage/648999]My CarDomain Page[/URL]
[FONT=Garamond]99 5.3 Z71 RC/SB - [COLOR="Blue"]FLT Level7 65E[/COLOR], [COLOR="Purple"]Circle-D Billet 258mm 2B Multi-Disc[/COLOR], Comp 206/212 515/520 114, LS6 Springs, Harland Sharp 1.7's, [COLOR="Red"]BlackBear 02 PCM[/COLOR], 02 Injectors, 160* stat, 05 E-fans, Nelson Harness, Volant CAI w/ Ram Air, StainlessWorks Headers and !Catted! Y-Pipe, DMH 3" E-Cutout, 18" Magnaflow dumped over axle, 3.73 G80, Dropped on Gibbs 20's [B]**H/C LQ9, 4.10's, and TruTrac eventually**[/B] [/FONT]
budhayes3 is offline   Reply With Quote
Old 05-19-2010, 09:31 PM   #3
Trader Rating: 0
Teching In
 
Join Date: Apr 2005
Location: conroe
Posts: 23
Default

thanks bud, I will give this a try, many thanks.
hammer71 is offline   Reply With Quote
Old 05-19-2010, 11:45 PM   #4
Trader Rating: 1
TECH Apprentice
 
1slowsilverado's Avatar
 
Join Date: Nov 2005
Location: Daytona Beach
Posts: 310
Default

2005 what? Only tsb I show for is for 07-09. But Vehicels (mainly chevy trucks) with code po449 evap vent problem I have found most of the time the connecter to the valve losses ground from the computer. The problem is at the pigtail, the wire turns green and looses connection 3or4 inches from connector. Use pigtail #pt250 to replace the bad connection. Also be sure to use updated valve and relocate the filter.
__________________
99 Silverado EC SB 5.3L, 02 PCM, TR220 112, Comp 918's, Long Tube Headers, 3" ORY, Efans, VPI CAI, Transgo HD2, Vette servos, Magnahoes And HPTuners of course.
1slowsilverado is offline   Reply With Quote
Old 05-19-2010, 11:57 PM   #5
Trader Rating: 19
PT's Slowest Truck

 
budhayes3's Avatar
 
Join Date: Apr 2004
Location: Hackensack, NJ
Posts: 17,872
Default

I'm assuming 2005 Silverado, especially since he said P0449 which sticks out in my head...here, this may help...

Bulletin No.: 02-06-04-037E

Date: April 09, 2009

Subject:
DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Check Engine Light On (Replace Evaporative Emission (EVAP) Vent Valve Solenoid Assembly and Add/Relocate Filter Box Using Service Kit)

Models:
1999-2007 Chevrolet Silverado (Classic) Models
1999-2007 GMC Sierra (Classic) Models
2007-2009 Chevrolet Silverado Models (Excluding Hybrid)
2007-2009 GMC Sierra Models (Excluding Hybrid)

Supercede:
This bulletin is being revised to add 2009 to the models. Please discard Corporate Bulletin Number 02-06-04-037D (Section 06 - Engine/Propulsion System).

Condition

Some customers whose vehicles are operated in dusty type environments, such as farming or mining off-road type applications, may comment about the illumination of the check engine light, with a DTC of P0446 (Restricted/Blocked EVAP Vent Path) being set.

Cause

Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition.

Correction (1999-2007 Classic/Old Style Models)

After following the published SI diagnostics for P0446 and determining that the EVAP canister vent valve is the cause of the MIL light, replace the existing EVAP canister vent valve assembly with a new assembly. This new assembly is a sealed unit that is designed to be vented through a remote filter box. To ensure correct installation, follow the procedures below.

1999-2003 Model Year (Use Service Kit P/N 19152345)

1. Raise the vehicle. Suitably support the vehicle.

2. Disconnect the EVAP canister vent valve electrical connector, if equipped.

3. Disengage the two vent valve pipe clips securing the pipe to the underbody. Remove the clips from the underbody and discard.

4. Disconnect the vent valve pipe at the EVAP canister.

5. Remove and retain the EVAP canister vent valve bracket mounting bolt.

6. Remove the complete EVAP canister vent valve assembly with bracket attached and discard.

Important
The new canister vent valve will be installed in a new location, outside of the frame.

7. Position and secure the new valve assembly to the frame bracket on the outside of the frame using the existing hole and mounting bolt.

Tighten
Tighten the bracket mounting bolt to 12 Nm (106 lb in).

8. Connect the vent valve pipe to the EVAP canister.

9. Install the two vent valve pipe clips into the existing underbody holes.

10. Connect the EVAP canister vent valve electrical connector, if equipped.

11. Attach bulk 5/8" heater hose to the vent valve port and secure using a clamp. Run a length as needed along the frame rail routing to the area above the transmission.

12. Cut the hose to determined length and install the supplied filter box. Secure using a clamp.

13. Remove the transmission support and lower the transmission assembly as necessary to allow for access to the new filter box location.

14. Secure the filter box to the transmission vent hose just forward of the hose tee-section using a tie strap. DO NOT pinch or restrict the transmission vent hose. The filter box opening should be pointing downward.

15. Raise the transmission and reinstall the transmission support.

16. Tie strap the hose as needed along the frame rail in order to keep the hose away from pinch-points and heat sources.

17. Lower the vehicle.


2004-2007 Model Year (Use Service Kit P/N 19152349)

1. Raise the vehicle. Suitably support the vehicle.

2. Disconnect the EVAP canister vent valve electrical connector.

3. Disconnect the canister pipe from the vent valve.

4. Push in the retainer and remove the existing canister vent valve from the fuel tank clip or mounting bracket. Discard the old valve.

5. Cut back the existing canister pipe approximately 51 mm (2 in) to remove the quick connect end.

6. Install the new canister vent valve to the fuel tank clip or mounting bracket.

7. Cut bulk 5/8" heater hose to a length of approximately 76 mm (3 in). Install the hose between the vent valve and the canister pipe and secure using clamps.

8. Attach bulk 5/8" heater hose to the vent valve port and secure using a clamp. Run a length as needed along the frame rail routing to the area above the transmission.

9. Cut the hose to determined length and install the supplied filter box. Secure using a clamp.

10. Remove the transmission support and lower the transmission assembly as necessary to allow for access to the new filter box location.

11. Secure the filter box to the transmission vent hose just forward of the hose tee-section using a tie strap. DO NOT pinch or restrict the transmission vent hose. The filter box opening should be pointing downward.

12. Raise the transmission and reinstall the transmission support.

13. Connect the EVAP canister vent valve electrical connector.

14. Tie strap the hose as needed along the frame rail in order to keep the hose away from pinch-points and heat sources.

15. Lower the vehicle.


Correction (2007-2009 New Style Models)

After following the published SI diagnostics for P0446 and determining that the EVAP canister vent valve is the cause of the MIL light, replace the EVAP canister vent valve assembly and relocate the remote filter box. To ensure correct installation, follow the procedures below.

Use Service Kit P/N 19152349

1. Raise the vehicle. Suitably support the vehicle.

2. Disconnect the EVAP canister vent valve electrical connector.

3. Disconnect the vent valve pipe quick connect from the canister.

4. Either cut the existing valve vent pipe and leave the remaining section of pipe in the vehicle or remove along with the valve.

5. Push in the retainer and remove the existing canister vent valve from the fuel tank clip or mounting bracket.

6. Cut back the existing canister pipe approximately 51 mm (2 in) and retain the pipe for use with new valve.

7. Connect the canister pipe quick connect to the canister.

8. Install the new canister vent valve to the fuel tank clip or mounting bracket.

9. Cut bulk 5/8" heater hose to a length of approximately 76 mm (3 in). Install the hose between the vent valve and the canister pipe and secure using clamps.

10. Attach bulk 5/8" heater hose to the vent valve port and secure using a clamp. Run a length as needed along the frame rail routing to the passenger side area above the transmission.

11. Cut the hose to determined length and install the supplied filter box. Secure using a clamp.

12. Remove the transmission heat shield, if necessary.

13. Remove the transmission support and lower the transmission assembly as necessary to allow for access to the new filter box location.

14. Secure the filter box to the transmission vent hose just forward of the hose tee-section using a tie strap. DO NOT pinch or restrict the transmission vent hose. The filter box opening should be pointing downward.

15. Raise the transmission and reinstall the transmission support.

16. Reinstall the transmission heat shield.

17. Connect the EVAP canister vent valve electrical connector.

18. Tie strap the hose as needed along the frame rail in order to keep the hose away from pinch-points and heat sources.

19. Lower the vehicle.
__________________
Billy
[SIGPIC][/SIGPIC]
[URL=http://www.cardomain.com/memberpage/648999]My CarDomain Page[/URL]
[FONT=Garamond]99 5.3 Z71 RC/SB - [COLOR="Blue"]FLT Level7 65E[/COLOR], [COLOR="Purple"]Circle-D Billet 258mm 2B Multi-Disc[/COLOR], Comp 206/212 515/520 114, LS6 Springs, Harland Sharp 1.7's, [COLOR="Red"]BlackBear 02 PCM[/COLOR], 02 Injectors, 160* stat, 05 E-fans, Nelson Harness, Volant CAI w/ Ram Air, StainlessWorks Headers and !Catted! Y-Pipe, DMH 3" E-Cutout, 18" Magnaflow dumped over axle, 3.73 G80, Dropped on Gibbs 20's [B]**H/C LQ9, 4.10's, and TruTrac eventually**[/B] [/FONT]

Last edited by budhayes3; 05-20-2010 at 12:06 AM.
budhayes3 is offline   Reply With Quote
Old 05-19-2010, 11:59 PM   #6
Trader Rating: 19
PT's Slowest Truck

 
budhayes3's Avatar
 
Join Date: Apr 2004
Location: Hackensack, NJ
Posts: 17,872
Default

Just realized that the bulletin that I posted is for P0446, not p0449...lemme look further into this, I may have my "6" and "9" mixed up...
__________________
Billy
[SIGPIC][/SIGPIC]
[URL=http://www.cardomain.com/memberpage/648999]My CarDomain Page[/URL]
[FONT=Garamond]99 5.3 Z71 RC/SB - [COLOR="Blue"]FLT Level7 65E[/COLOR], [COLOR="Purple"]Circle-D Billet 258mm 2B Multi-Disc[/COLOR], Comp 206/212 515/520 114, LS6 Springs, Harland Sharp 1.7's, [COLOR="Red"]BlackBear 02 PCM[/COLOR], 02 Injectors, 160* stat, 05 E-fans, Nelson Harness, Volant CAI w/ Ram Air, StainlessWorks Headers and !Catted! Y-Pipe, DMH 3" E-Cutout, 18" Magnaflow dumped over axle, 3.73 G80, Dropped on Gibbs 20's [B]**H/C LQ9, 4.10's, and TruTrac eventually**[/B] [/FONT]
budhayes3 is offline   Reply With Quote
Old 05-20-2010, 12:01 AM   #7
Trader Rating: 19
PT's Slowest Truck

 
budhayes3's Avatar
 
Join Date: Apr 2004
Location: Hackensack, NJ
Posts: 17,872
Default

Here's the thread that stuck out in my head in reference to this code...

code p0449

Quote:
Originally Posted by 1slowsilverado
2005 what? Only tsb I show for is for 07-09. But Vehicels (mainly chevy trucks) with code po449 evap vent problem I have found most of the time the connecter to the valve losses ground from the computer. The problem is at the pigtail, the wire turns green and looses connection 3or4 inches from connector. Use pigtail #pt250 to replace the bad connection. Also be sure to use updated valve and relocate the filter.
This sounds like it will do the trick
__________________
Billy
[SIGPIC][/SIGPIC]
[URL=http://www.cardomain.com/memberpage/648999]My CarDomain Page[/URL]
[FONT=Garamond]99 5.3 Z71 RC/SB - [COLOR="Blue"]FLT Level7 65E[/COLOR], [COLOR="Purple"]Circle-D Billet 258mm 2B Multi-Disc[/COLOR], Comp 206/212 515/520 114, LS6 Springs, Harland Sharp 1.7's, [COLOR="Red"]BlackBear 02 PCM[/COLOR], 02 Injectors, 160* stat, 05 E-fans, Nelson Harness, Volant CAI w/ Ram Air, StainlessWorks Headers and !Catted! Y-Pipe, DMH 3" E-Cutout, 18" Magnaflow dumped over axle, 3.73 G80, Dropped on Gibbs 20's [B]**H/C LQ9, 4.10's, and TruTrac eventually**[/B] [/FONT]

Last edited by budhayes3; 05-20-2010 at 12:15 AM.
budhayes3 is offline   Reply With Quote
Old 05-24-2010, 04:29 PM   #8
Trader Rating: 0
Teching In
 
Join Date: Apr 2005
Location: conroe
Posts: 23
Default

If I read this right, P0449 can be tuned out? this looks like way too much trouble for fumes.
hammer71 is offline   Reply With Quote
Old 05-24-2010, 09:59 PM   #9
Trader Rating: 2
On The Tree

 
08k1500_3's Avatar
 
Join Date: Apr 2010
Location: Ellington CT
Posts: 160
Default

Just get the update kit that Budhayes listed there and install it as the bulliten says. GM uses the P0446 for the main cause, but the same issue causes the EVAP vent performance P0449 to set more often than P0446 code.

Tips for install:
To get vent off tank, just pull it down and twist, it will pop right off.
Cut the original hard plastic pipe about 1" from old vent. (use 5/8 heater hose to connect to new vent solenoid.
Run the hose from the top of the valve down the frame rail to the top of the transmission.
Should take about 20 min. to install


Parts: GM# 19152349, about 9' of 5/8 heater hose, 4 clamps and a couple of zip ties.
__________________
2008 NNBS 4wd RCSB 5.3/Patriot stage II 243's/TSP 224r cam/DOD delete/Calspeed 1 7/8" LT's ORY/Nelson tuned/Zex 125 shot/Powertrax Quik-loc/Circle-D 3200/Caltracs/3-4 drop
422rwhp/458tq before heads... Sold

New DD 2012 ECSB 5.3/6L80E.. Stock...

Drive Fast, Take Chances!
ASE Master/L1 Certified GM Technician
08k1500_3 is offline   Reply With Quote
Old 05-25-2010, 05:43 AM   #10
Trader Rating: 12
11 sec. Truck Mod

 
TIM Z's Avatar
 
Join Date: Dec 2005
Location: OH IO :(
Posts: 9,440
Default

My wifes 05 tahoe had the same issue, i just put a new EVAP vent sensor on and no problems since, i didnt reroute the hose either.
__________________

President of the Dirty Sanchez Club
2000 ECSB Z71 LT
LQ4 / TVS 1900@15psi/2barSD Dyno tuned by TJ.
Blower Cam- AlkyControlMeth-LTs LC32 8Rib
Billet 4L80E built by Mark Buck @ Precision Automotive
11.6@114@12psi no meth 1.6 60'-new times coming.
627rwhp-615tq 2nd gear dyno pull .
2009 Sierra Denali AWD- blk on blk/6.2/A6
SOLD-07' DMAX Built Trans/EFI Live - /05' Tahoe Z71. 04' 2500 Van 6.0/80E
Huge thanks to Pat(03sierraslt)and Mark Buck , and TJ !
TIM Z is offline   Reply With Quote
Old 05-25-2010, 05:43 AM
PerformanceTrucks
Ford F150




Paid Advertisement
Reply

Tags
02, 037d, 04, 06, central, check, code, emission, engine, evap, gm, po449, solenoid, system, tsb, valves, vent


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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:59 PM.

 



Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

PerformanceTrucks.net and InternetBrands, Inc. are not affiliated with the Ford Motor Company