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P0449 vent valve malfunction - 1999 Buick Regal

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Gm has a good design on the ventvalves but they get clogged check with your local gm dealer to see if they have a replacement for it there is anew design for newer cars not sure about older ones

Posted on Oct 01, 2010


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Posted on Jan 02, 2017

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SOURCE: Looking for the evap canister vent valve on a 2006 Silverado

if you look underneath the vehicle on drivers side in the area beneath drivers you with see a plastic rectangular sort of shaped box this is evap canister and vent valve is there in this area.

Posted on Jun 20, 2009

  • 2049 Answers

SOURCE: P0449 Evaporative Emission Control System Vent

While looking for the location of the vent/solenoid for you, I came across a blog that said this error can be caused by a loose or faulty gas cap. You may want to look at that first and possibly solving the problem. Replace the cap, get autoparts store to reset the code and see what happens.

Posted on Jan 07, 2010

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SOURCE: code p0449.

GM uses an EVAP solenoid that is located under most vehicles near the gas tank and connects to the charcoal filter can. Codes can be set and will drive you crazy trying to figure out if you have a bad gas cap, broke lines---this is where they try to get you to do a smoke test, or you just think the vehicle is no good! Relax, it is usually an easy fix and one GM has known about for years but continues to make easy money off people who cannot do basic maintenance. Now one code that comes up is usually P0449, along with maybe a warning to check the gas cap to see if it is on tight! GM will gladly read this code out for you for around $98.00 and then fix it for another around $100.00 which includes the EVAP part which if you buy at their parts dept. will cost you $32.00 and my dealership parts man told me they sell one a day! It is easy money for them and obviously a defective part they keep using for the last 10 or 15 years but hey, its money in their pocket. Here is how to fix it with ONE single common screwdriver! Get under the vehicle after putting on the parking brake. The EVAP solenoid is easy to spot near the gas tank and it has one electric connector which disconnects by releasing the plastic clip and pulling the connector out. It also has ONE air line connected which goes to the charcoal cannister which also can be removed with the one screwdriver. The whole EVAP solenoid and air can can be removed with the screwdriver which makes it easier to unplug the electric and air line. Get a replacement from the dealer as they certainly are familiar with this part as they sell LOTS of them. Then just go under and plug the new one in and the problem is solved. Now if you do not have a tool to reset the codes, try the local parts places as most of them will do a reset for you.

Posted on Jan 24, 2010

Testimonial: "thanks alot.i appreciate all your help .the explanation was very good.gonna go by dealer to get the part.ill let u know how it turned out."

  • 262 Answers

SOURCE: Getting codes P0455 and P0449. From what I read,

The vent solenoid valve has been redesigned to correct the problem you are having. I would recommend purchasing the dealer component.
I am not aware of any aftermarket parts suppliers.

Posted on Feb 25, 2010

SOURCE: The check engine light on my Chevy Silverado cam

That is laymans terms. That is why it is in your manual. You ,need to get up to speed ,on todays somewhat high tech vehicles.
Now you need to go to a shop that does EVAP testing, with a smoke machine,if necessary,or at least put a scanner on it ,and replace the vent valve solenoid,if bad.(again laymans part teminology,

Posted on May 12, 2010

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2007 Buick Rainier 4.2 Code P0449, EVAP solenoid valve was replaced, codes cleared, code reappears within a minute. What else could be worn if not the Solenoid Valve?

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

The fact that it came on right way means that the code was correct and you jumped the gun in replacing the part. You've got a CIRCUIT issue, ie a wiring problem

Mar 26, 2018 | 2007 Buick Rainier

1 Answer

What makes my Chevy malibu 2005 v6 put system code po449 out

P0449 - OBD II Trouble Code Evaporative System Vent Valve/Solenoid Circuit Malfunction Our emissions expert has put together the following information about the P0449 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
OBD II Fault Code
  • OBD II P0449
Fault Code Definition
  • Evaporative System Vent Control Circuit Malfunction
What does this mean? The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions-dictated by engine temperature, speed, and load-the EVAP system stores and purges these captured fuel vapors back into the combustion process. The carbon canister, which stores the raw fuel vapors, utilizes a vent valve that allows fresh air to enter the EVAP system. This displaces the fuel vapor as it's purged into the combustion process. Code P0449 indicates that the evaporative control (EVAP) system vent valve solenoid is malfunctioning. This can be caused by either too little or too much electrical resistance or a mechanical problem with the vent valve itself. Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be a noticeable fuel odor caused by the release of fuel vapors
Common Problems That Trigger the P0449 Code
  • Missing fuel cap
  • Defective Evaporative Vent Valve
  • Defective or damaged fuel cap
  • Distorted, damaged or cracked Fuel Tank Filler Neck
  • Torn or punctured Evaporative system hose(s)
  • Defective Fuel Tank Sending Unit gasket or seal
  • Split or damaged Carbon Canister
  • Defective or damaged fuel tank
Common Misdiagnoses
  • Fuel cap
  • Evaporative Purge Valve
  • Evaporative Vent Valve
Polluting Gases Expelled
  • HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog

P0449 OBD II Trouble Code

Jan 30, 2017 | Cars & Trucks

1 Answer

Is there a fuse for the vent solenoid? getting P0449 code but vent is good.

code p 0449 refers to evaporative emission (EVAP)system, vent valve ---circuit malfunction===causes --wiring ---EVAP cannister purge valve ---ECM
check the wiring for breaks , bad connections
replace the purge valve
the vent valve is part of the purge system of the EVAP system( fuel system)

Oct 08, 2016 | 2005 Chevrolet Equinox

1 Answer

What are the probable causes of DTC P0449?

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

Check for good connection, else replace

Aug 18, 2015 | 2009 Chevrolet Impala

1 Answer

On my Hyundai Elantra code P0449 do I need to replace the CANV solenoid?

code p0449 refers to evaporative emission(EVAP) system, vent valve ---circuit malfunction===causes --wiring---EVAP cannister purge valve---ECM
replace the purge valve

Jul 06, 2015 | Hyundai Cars & Trucks

1 Answer

Code p0449 vent solenoid intermittent

EOBD II Error Code: P0449
Evaporative Emission (EVAP) System, Vent Valve - Circuit Malfunction
Possible Cause:
Wiring harness.
Evaporative emission (EVAP) canister purge valve.
Engine control module (ECM).

Dec 28, 2013 | 2001 Pontiac Montana

2 Answers

Engine light stays on because of DTC P0449. How so you fix the problem with DTCP0449?

  • P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.if the gas cap is not tieght. if you filled up with car running this code will come on or if there is a leak in the e vap system it can be found by a smoke clear the code is with a scaner.goodluck
  • Feb 28, 2011 | Chevrolet 1500 Cars & Trucks

    1 Answer

    P0449 ?

    P0449 = Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction...

    May 30, 2010 | 2001 Hyundai Santa Fe

    1 Answer

    2002 chevy blazer codes 443 449 i replaced the maf sensor the vaf sensor on air horn the emmision valve on the engine the vent valve to even tried the gas cap clear codes drove the truck guess what codes...

    p0443 is evaporative emission control system, purge control curcuit malfunction, p0449 is emission control system, vent control curcuit malfunction. p0449 is often a filler cap problem on fuel tank. try tightening cap

    May 20, 2010 | 2002 Chevrolet Blazer

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