Trying to understand my problem.

Tiny
GARYSIEDLECKI
  • MEMBER
  • 2006 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 42,249 MILES
My engine light is on and I did a troubleshoot and I got a trouble code - P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction - But im not sure exactly how to correct it. My gas cap it also tight too, I was told it could have been that so im not sure please give me some good advise!
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Monday, October 13th, 2008 AT 4:05 PM

17 Replies

Tiny
MERLIN2021
  • EXPERT
The full instruction and diagrams for replacing the solenoid are attached below

Let us know if you need anything else
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Monday, October 13th, 2008 AT 4:09 PM
Tiny
GARYSIEDLECKI
  • MEMBER
If I dont have time to take it right, will it effect anything or cause more problems, and could this be the reason I have really bad gas milage?
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Monday, October 13th, 2008 AT 4:22 PM
Tiny
MERLIN2021
  • EXPERT
I wouldnt wait too long, you may smell fumes if the vent is stuck open.
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Thursday, October 16th, 2008 AT 4:47 PM
Tiny
CANOEIST3
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 64,000 MILES
I am getting a p0449 engine code
evap vent vlv/ sol malf. Every thing I have read says to clean ( blow out sol. )Check plug conection or to change solenoid.

My question is where is the solenoid.

I have a 32 gallon gas tank. It is an extended cab, long bed
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
BRIAN 1
  • MEMBER


http://www.2carpros.com/forum/automotive_pictures/147643_vent_1.jpg

dont bother to blow it out,it dosent fix anything,just replace it.there is an updated kit that relocates the filter.here is the Service Kit P/N 19152349.
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
CANOEIST3
  • MEMBER
I've been looking underneath my truck but can not find that part , could it be located at back of the fuel tank, I do have something attached to the tank.
( left pic) also where is the charcoal canister located. I can not seem to find it. could it be the picon the right ?


http://www.2carpros.com/forum/automotive_pictures/546094_solenoid_001_1.jpg


http://www.2carpros.com/forum/automotive_pictures/546094_canister_3.jpg

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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
BRIAN 1
  • MEMBER
Sorry I should have been a little clearer on my info, the one on the left is the vent solenoid and the one on the right is the charcoal canister. Replace and relocate the vent solenoid.
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
CHRISKEISER
  • MEMBER
  • 2009 CHEVROLET SILVERADO
  • 68,000 MILES
Im getting code p0449 vapor vent solenoid I looked it up oreillys autoparts has 2 a single port part cpv16 and a 2 port part cpv44 the only difference I see is 2 port has a fliter coming off the 2nd port does it really matter which one I use
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
You need the one that matches the one you have now. How do you know its bad?Just a code doesn't mean that is the problem setting the code.
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
LED288
  • MEMBER
  • 2003 CHEVROLET SILVERADO
How do I fix the emissions vent valve?
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
DENNYP
  • EXPERT
Check with your local GM dealer. There is an updated parts kit. The valve gets replaced and the filter gets located above the transmission. They should have a copy of a service bulletin for this.
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
WOODYODA
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 204,000 MILES
03 chevy silvarado 5.3. Can the evap purge valve cause a lean mixture code? My truck has no egr valve. My guess is the purge valve took it place.
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
WOODYODA
  • MEMBER
Thanks for the reply but my truck has no egr valve. Part of my question was does the evap purge valve serve the same purpose?
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
RASMATAZ
  • MEMBER
Exhaust gas recirculation has nothing to do with fuel vapors
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
BUTCHW73
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 54,339 MILES
I have a code in My truck and it keeps coming back.
I tried to retighten the fuel cap and it is fine I inspected the seal and it is good and clean. I have replaced the EVAP control valve and still it pops right back up. How do you find the leaks on the hoses or In the sensor. Or where is the sensor?
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Wednesday, October 31st, 2018 AT 6:56 PM (Merged)
Tiny
SCOTTY DEE
  • MEMBER
Flowing this particular code can be a real bitch. You are going to need a scan tool to monitor fuel tank pressure as well as a smoke machine to determine if there are any leaks in the system. You will probably have to hire a technician to perform the necessary tests.

Look at it this way, you're already out the money for one part that didn't work, don't try for two!
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Wednesday, October 31st, 2018 AT 6:57 PM (Merged)

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