P0449 Code?

Stl05Silverado · August 11, 2008

Ok, check engine light on AGAIN, making me really mad..well had it coded and its a P0449 code, and it says its the Purge or vent solenoids or failed the EVAP vent solenoid. Any help here??

Thanks

edbede · September 14, 2008

Ok, check engine light on AGAIN, making me really mad..well had it coded and its a P0449 code, and it says its the Purge or vent solenoids or failed the EVAP vent solenoid. Any help here??

Thanks

Hey Chris, did you fix this problem? I have the same problem and have some ideas on what to look at.

pontiac69 · October 7, 2008

my check engine light just came on so i took it to the dealer. dealer said code 0449. so he replaced the vent solenoid which cost me 423 bucks which i think is rediculas. he also said he had to relocate it because chevy said so. he had no idea why it was just in the code on replacing the part. so they also charged me for extra hoses and clamps to do so. not to mention 2 hrs of labor at 95 bucks an hour. i went to a local mechanic and he can get the part directly from gm for 102 bucks and the dealer charged me 160.

now that i got screwed on that, a day later the check engine light came on again. so i called to complain. they said bring it back in and we will check it again. now i look at the part that they replaced and mine looks new. if they had to move it because chevy said so then i should have to pay for labor or parts to do so since it is a factory defect on location. if the same code comes up then i want the old part put back in and rembersed for the labor and part.

what are your thoughts

Supertech64 · October 11, 2008

Hard to say anything on your problems really.

I have went through this diagnostic a few times in the shop, it basicaly has you comand it on with the Tech2 and listen for a click(indication the vent valve is working), then check its function with a test light power/ground/control circuits.

Most of the time its the EVAP canister vent solenoid valve or poor terminal contact in the connector, in my experience. Pontiac69s problem looks like wireing, but its hard/impossible to say without checking it with the Tech2 and test light.

There are no bulletins or PI documents on this concern.

JA_Silverado_04 · October 11, 2008

The TSB the dealer is referencing for "relocating" the Evap Vent Valve is 02-06-04-037D. I'm getting ready to take a look at mine. It seems to be a design defect to me!

I have no idea why it is happening again after they replaced the Vent Valve Solenoid though. Maybe its really a bad connection as SuperTech64 mentioned.

Has anyone done this job? Mine is a regular cab long bed. Seems like a real pain to get at it. Is there a trick to removing the hard hose from the tank side - and how do you undo those hard hose retaining clips. They are hard to get a good look at.

The new TSB suggests that you lower the transmission and place the vent near the top of the transmission, is that really necessary?

Supertech64 · October 11, 2008

#02-06-04-037D(Dirt buildup that clogs the vent, mostly on farm vehicles but found on others as well) is for P0446... Thats why I missed it. They probaly performed that to protect them from a future reocurrance of part failure. Shows the tech working on your vehicle is familar with this type of work atleast, nobody likes a comeback thats not technicaly their fault.

Chance you got a bad replacement valve is not likely. Wireing(connectors mostly...loose, corroded, etc) is definately suspect.

I have replaced them on many diffrent models. Typicaly on your truck if I'm remembering right it has two tabs(part of the hose end) that you have to squeeze together really hard and wiggle it(sometimes I cheat with a radiator hose removal tool or a 90degree pick if I can get my eyes on it to make sure I'm not destroying it to fold in the tabs)...its never easy for me, but there are guys in the shop who have no problem with it. I always locate it where the text tells me to.

arlonadkinson · July 25, 2009

#02-06-04-037D(Dirt buildup that clogs the vent, mostly on farm vehicles but found on others as well) is for P0446... Thats why I missed it. They probaly performed that to protect them from a future reocurrance of part failure. Shows the tech working on your vehicle is familar with this type of work atleast, nobody likes a comeback thats not technicaly their fault.

Chance you got a bad replacement valve is not likely. Wireing(connectors mostly...loose, corroded, etc) is definately suspect.

I have replaced them on many diffrent models. Typicaly on your truck if I'm remembering right it has two tabs(part of the hose end) that you have to squeeze together really hard and wiggle it(sometimes I cheat with a radiator hose removal tool or a 90degree pick if I can get my eyes on it to make sure I'm not destroying it to fold in the tabs)...its never easy for me, but there are guys in the shop who have no problem with it. I always locate it where the text tells me to.

Check engine P codes! Chevrolet uses an EVAP solenoid that is located under most vehicles near the gas tank and connects to the charcoal filter can. All this switch does is open when the key is turned on and allows air to exhaust out of the charcoal canister! 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 Chevrolet has known about for years, but continues to make easy money off of 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 Chevrolet Avalanche will give you lots more room. The EVAP solenoid is easy to spot near the gas tank and charcoal canister 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 canister which also can be removed with the one screwdriver. The whole EVAP solenoid and air can, is easy to remove 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, especially my favorite place, called Pepboys or Aamco! 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! Now some people say to unplug the black lead but when I did this on the Avalanche the heater on the passenger side would not go to cool but after about 5 off and ons of the ac it finally did! When I unplugged the red lead it worked ok. Make sure before you unplug the battery cable, you turn off everything you can like radio, air, heat, lights, ect.! The codes are reset but of course now you have to reset the radio and clock stuff! Chevrolet put this unit under the vehicle I guess so it could collect enough dust to fail after the initial 36 month, 36,000 mile warranty! Course the new part is guaranteed for ONE year so keep all the old parts in case you have another failure in ONE year and you can exchange them for another new one! Not too bad to have a spare! They should have recalled and replaced this unit years ago but who is gonna make them? They make money out of this little defective unit and still have no idea why they went into chapter 11 bankruptcy and are headed for chapter 7 if they fail to get connected to their customers and quality! This one little item is enough for a person like me who bought this 2005 Avalanche Z71 and who thinks it is a great truck to NEVER ever again buy a GM product! Another peeve I got with GM is they do not match the spare tire with the tires on the truck! I have really good Goodyear tires on the ground but after 4 years and my first flat, I take down the spare and it is a 16 inch instead of a 17 inch and it is a Bridgestone! GM just does not get QUALITY! This info brought to you by [email protected]!

odayflor · August 11, 2009

***IMPORTANT INFORMATION YOU MUST READ*****

Ok everyone, listen up....If you have a 04 and newer silverado, with a failed evap vent solenoid, you have to read this info. Do not pay $100+ for this part(actually $150.00 at the dealer). The following part numbers associated with this part have been gm#19207763,19152349, and AC DELCO #'s 214-2082 costing over $100.00 for the modified part. This is for the modified part, with the relocation of the filterbox, and the added hose that seperates the two. No one at Gm will tell you this, but this same part, that was origionally on your silverado, is also used in the 2006 Suburban. It will be an identical replacement for what is ON YOUR TRUCK, and the cost is $24.04 AT THE DEALER. I know this because I own a 2006 silverado, and a 2006 suburban. Looked at the suburban when the part went bad on the silverado(from overfilling the tank)and bingo, same part. Ask a parts person at GM, and they will tell you otherwise, but they are lying to you. Bought the suburban part today part # 25932571 (GM #) and everything is identical, right down to the numbers stamped on the part itself. Took the part off my silverado, put the replacement on (which gm told me is not the right part), cleared the codes, and bingo no more light after 3 consecutive starts...... Why, is it that GM feels we need to pay the price for something they did wrong???? And moreso, lie to us, telling us the $150.00 part is our only choice to fix the problem. My truck went 40K miles with the origional part, and probably only went bad because of my own stupidity in overfilling the tank, whay would I not just want to spend $24.00 to put on the same part, that will probably go the rest of the life of the truck with no tank overfills???? I say CLASS ACTION LAWSUIT FOR EVERYONE THAT HAS BEEN SCAMMED INTO PAYING THE RIDICULOUS PRICE that GM is trying to suck out of us.....Please pass this on to the world, and every forum you can...Get the word out....Let the parts people at GM know we are on to their BS, and they can't take advantage of us like they have.....

dlgg7 · September 2, 2009

THANKS! for your reply Odayflor! I have an 03 Silverado 5.3L, and I went yesterday to the dealership and got this part # you listed. WELL, I had to change the vent tank from my old one to the new solenoid because the new one is bigger and I couldn't get it up where the old one was mounted at, and had to do some grinding to get the tube that fit into the vent tank to match the tube on the old solenoid, BUT well worth it! THANKS!

Beer Belly · September 3, 2009

I think I'm having the same problem that evryone is talking about. 2006 Silverado, 5.3l, 50,096 miles. Check Engine Light came on, then DIC flashed "Tighten Fuel Cap"....it was tight, rechecked it anyhow. Called the dealer and asked if they could just check for codes, they said "yes, for $99.95"....I worked for Volvo/ Nissan, and we would take our Scan Tool and check for codes for free, ain't no way I'm paying $99.95. So, does this "Tighten Fuel Cap" scenerio sound like it is actually a EVAP Selinoid???

bigredmariner · September 3, 2009

I think I'm having the same problem that evryone is talking about. 2006 Silverado, 5.3l, 50,096 miles. Check Engine Light came on, then DIC flashed "Tighten Fuel Cap"....it was tight, rechecked it anyhow. Called the dealer and asked if they could just check for codes, they said "yes, for $99.95"....I worked for Volvo/ Nissan, and we would take our Scan Tool and check for codes for free, ain't no way I'm paying $99.95. So, does this "Tighten Fuel Cap" scenerio sound like it is actually a EVAP Selinoid???

Sounds like it, more than likely if P0449 is popping then that's your problem ( Solenoid). It's a common thing with our trucks, mine's a 2006 and I just did mine a couple of months ago.

Beer Belly · September 3, 2009

Thanks, think I'll give it a shot. Funny thing happened, my Wife just called, she's on her way to work, her DIC just flashed "Tighten Fuel Cap", 2008 Saturn Aura