Question about Chevrolet Cars & Trucks
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Posted on Jan 02, 2017
The first code is for the secondary air injection system. It could be as simple as a fuse or broken wire. It could also be the air pump. The second is the purge solenoid control circuit. Again it could be a wire or the solenoid. The third is also a EVAP code related to the vent valve, and may also be the wiring or the valve. Did all these codes set at the same time? If so you may be looking at a PCM problem. It is really hard to venture a guess at the cost without lnowing more. I advise you to use a good shop that you trust. It will take some special equiptment to properly diagnose these issues. Good Luck
Posted on Jun 24, 2009
Some might have an ses p0446, evap emissions vent circuit low. If you
take it to the dealer they want 300-400.00 to fix the problem. GM has a
service bulletin on this condition and have the updated part for 180.00,
thats suppose to eliminate this issue.
Basically the problem is, the evap purge vent valve gets clogged with dirt, especially if the truck is used in dirty conditions. Well I figured there had to be a cheaper way to cure this problem.
Here it is:
1) find the location of the vent valve; its under the truck, locate the charcoal canister on the front of the gas tank and trace the vent line to the vent valve.
2) Take the bracket loose with a 5/8 wrench.
3) Spin the valve around so the side with the hole is facing you.
4) Take an air compressor and blow the vent valve out.
5) reinstall and clear the code and it's fixed.
Now I know the updated part from gm is supposed to keep the valve from clogging ever again, but why spend the money when all you have to do is blow out the vent valve every 50k-100kmi and save your $$$!
Subject: DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Service Engine Soon (SES) Lamp Illuminated (Replace Hose/Evaporative Emission (EVAP) Canister Vent Asm) #02-06-04-037A - (02/02/2005)
- 1999-2003 Chevrolet Silverado Models
- 1999-2003 GMC Sierra Models
This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-06-04-037 (Section 06 -- Engine/Propulsion System).
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 instrument panel SES light, with a DTC of P0446 (Restricted/Blocked EVAP Vent Path) being set.
Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition.
Part Number 15086429 Hose Asm-Evap Emis Cnstr Vent
Removal & Installation
Purge Solenoid Valve-2.2L (L61) Engine
Purge Solenoid Valve-2.4L Engines
NOTE The EVAP canister may have released carbon particles, which caused this part to fail, and may cause damage to other components. Check the EVAP canister for loose carbon before returning the vehicle to service.
Vent Solenoid Valve-2.2L & 2.4L Engines
Hope this help (remember commetn and rated this).
Posted on Apr 21, 2010
SOURCE: code 499 large evap leak
this is a common easily fixed problem if you have a 2000.00 dollar smoke tester and a good scanner without these good luck obd2 alowance for evap leaks is a .020 " hole without smoke not happening
find the big black can with vacume lines on it check the lines are tight not dried up the purge solonoid all the lines check the seal on your gas cap are good places too start but without smoke machine it will be alot of hit and miss
Posted on May 18, 2010
Check engine P codes. 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. Chevrolet 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 and if you a little hefty, then removing the spare tire on the some vehicles will give you lots more room. 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 unpolug the electric and air line. Get a replacement from the dealer as they certainly are familar 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. If you do not have someone to do it, it can be done simply be removing the RED, positive lead off the battery and wait a minute and then plug it back in. The codes are reset but of course now you have to reset the radio and clock stuff.
Hope helps (remember to rate this answer).
Posted on Nov 15, 2010
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