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Discussion Starter #1
Most of us have had this problem and some have not bothered with it. Well because of this My remote start will not work so after doing all the research I could I found all the info I needed and a good video. The work can be done in your driveway in under an hour and you don't need much tools..

#1 Flat head Screw driver
#2 Some kind of cutters for wire ties
#3 13mm Socket

Thats it Oh and a Creeper will help....


Ok parts needed from the dealer ship.. Some might need a Adp too..

Main part about $65-$80 Adp if needed $25-$35 (Chew them down all it is is 2 plugs and wire with loom)

http://www.youtube.com/watch?feature=player_embedded&v=w1ZbKIGlojA

This Video is good but they did miss a few things that I will add like an Adp that some of you might need..

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here is the Part about $70-85.. evap5.jpg evap7.jpg

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Ok first off lowering the Spare tire will help alot.. then locate the part and all the hoses..
evapfix1.jpg evapfix2.jpg evapfix3.jpg evapfix4.jpg

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Ok start taking the filter tube off of the gas lines a few wire ties then find where the hose goes in at the canitster. as you see in the video a good long flat head screw driver will help with getting the Adp off. then you can take the valve off with the screw driver also just pull back the clip and slide it off..

evapfix5.jpg
when you get all the tubes off you can now take the bracket off the frame rail. with a 13 MM socket.

Here are some pics of the old and new.. Also look at the Plug here..

Remember Round does NOT go into Square hole....
So you might need the $30 Adp...

evapfix8.jpg evapfix10.jpg evapfix11.jpg

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Here is the old and new next to each other..

evapfix6.jpg evapfix7.jpg
Anyway Put it all back reconnect the + Batt post and you are done. The Plug into the Canaster goes right in and the breather goes up the filler line by the gas cap. Put the new Valve on the frame and tighten the 13 MM bolt and Start'er up!!!!!

Remote start works too...


Good luck..

evapfix12.jpg

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So I was at a New Years eve party and one of my friends there has a 07 LTZ Sub. So we were talking and he told me that his check light is on and his remote start is not working...:gasp: I asked if he took it to the dealer yet and he said Nope been on for 6 months.. I just so happen to have my Superchips programer in my truck and said Lets go take a look... Sure enough P0449..:glasses: I told him I can fix that...... IF you have a heated garage.. I'll be getting the parts for him this week and his Wife gave me a BIG Hug.....
 

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Discussion Starter #2
Has anyone else done this yet? Any problems?
 

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getting ready to do mine this weekend. My light came on yesterday. PO449 and PO455.
these parts go bad most times from overfilling the fuel tank, then after a very short trip park the vehicle in an area where the fuel will heat up . this then causes fuel to expand and foul the charcoal canister with liquid fuel. this creates a black sludge that damages the valves/solenoids. very common problem with over filled vehicles and a heated garage .
 

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these parts go bad most times from overfilling the fuel tank, then after a very short trip park the vehicle in an area where the fuel will heat up . this then causes fuel to expand and foul the charcoal canister with liquid fuel. this creates a black sludge that damages the valves/solenoids. very common problem with over filled vehicles and a heated garage .
Yep, thats me. I always fill up past the first time the gas pump shuts off.
 

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OK so, Im a lazy sob. Im still procrastinating. GOnna tackle over Xmas holidays. Can u verify that this part # IS for NNBS? I have a 2010 Silverado.
 

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OK so, Im a lazy sob. Im still procrastinating. GOnna tackle over Xmas holidays. Can u verify that this part # IS for NNBS? I have a 2010 Silverado.
I would not buy anything until you have inspected this for all that was mentioned.

you could possibly need a new canister if you filler up too much and then park it with out burning OFF the excess fuel.
 

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how do I determine if the canister is bad??
remove hoses and look for black goo. also any cracks they can crack. the lines also get pinched kinked with improper handling as some have had fuel system repairs and the bodyshop / mechanics are sloppy..

another example which I have dealt with was frame welding melted the line with hot metal splashing ,.
 

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Discussion Starter #10
Please take pics of what you are doing to help other members..
 

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Just fixed my po449 code. Bought the "vapor canister vent valve" from Napa. Part# 600-1627. Cost was 94.99 they sold it to me for "garage cost" at $77.99. This valve is connected to the filter. I just uncoupled the one clip, turned the solenoid 40 deg and pulled it out. This is located at the front of the gas tank, drivers side frame. Very easy fix for a BS system. Everyone's solenoid is normally open and when u start the vehicle it closes for vacuum purposes. My solenoid was bad so it was venting all the time. I also bought a foot of 5/8" hose and connected it to the charcoal cannister on the tank. So nothing is moved. I blame the failure on a POS Mexico made solenoid. I ain't buying the relocation thing.
 

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change you fill up methods and you may be OK. if the canister is damaged from liquid fuel after a period of time this may return.
 

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After a couple hundred miles, I now keep getting a PO446 code. I take the hose of the vent solenoid and can only blow air thru if the gas cap is off. Take the cap off and blow right thru it????
 

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what about the code PO446. I have a 2005 suburban 2500,6.0 engine,what would be the fix for that
what that means is the venting of the fuel tank is NO.... plugged up canister from over filling the tank then parking vehicle to allow the fuel to over flow into the charcoal.. then the damage .
 

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Good Info, Thanks for posting!
 

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Discussion Starter #18
Glad to see that this has helped so many....:cool:
 

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Replacing the charcoal cannister and other EVAP parts only helped for a very short while.

A friend who is a Cadillac Technician, advised Me to open the hood, open the large fuse and relay box, and locate a twenty amp (yellow) fuse C2, if memory serves.
Pull that fuse, switch the ignition to on, then off, then replace that fuse.
This action clears the memory of any codes in the PCM, according to My friend.
Actually, I cancel the code first, with a scanner, then do the fuse magic.

During springtimne, when the overnight temps fall to 40's to 50's in SW Florida, then rise to high 70's and low 80's, the EVAP system will set off a code.
The rest of the year, no problem at all, because it's always hot down here.
My friend had expanded the parameters on that pesky EVAP system, and We didn't have any problems for 7 years, until the Chevy Dealer replaced the speedometer, and re-flashed the PMC....then the code reappeared.
 

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Replacing the charcoal cannister and other EVAP parts only helped for a very short while.

A friend who is a Cadillac Technician, advised Me to open the hood, open the large fuse and relay box, and locate a twenty amp (yellow) fuse C2, if memory serves.
Pull that fuse, switch the ignition to on, then off, then replace that fuse.
This action clears the memory of any codes in the PCM, according to My friend.
Actually, I cancel the code first, with a scanner, then do the fuse magic.

During springtimne, when the overnight temps fall to 40's to 50's in SW Florida, then rise to high 70's and low 80's, the EVAP system will set off a code.
The rest of the year, no problem at all, because it's always hot down here.
My friend had expanded the parameters on that pesky EVAP system, and We didn't have any problems for 7 years, until the Chevy Dealer replaced the speedometer, and re-flashed the PMC....then the code reappeared.

if you fill up the tank then park it , you will have all these EVAP code problems.
up north in winter when the fuel tank is filled then parked in a heated garage after a short drive this happens all the time.

with a code reader/reset tool no need to remove fuses or disconnect the battery for a reset. many of the newer GM vehicles have had defective pressure transducers causing these codes also. many though do have damaged canisters with this design because the canister in next to and below the fuel tank . too close and too low.
 
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