2007 Silverado Classic Code 0449 Help

[Heg87t]

Hey Everyone,
5.3L v8.

My engine light popped on this week. Code is 0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction. I cleared the code and it came back about a minute later. Still runs strong. I can't notice a difference with the light on.

Anyone on the board have expericence with this one? Ideas for fixing?

TIA

 

[jpwalt1987]

My CEL has been on with that code for about 4 years now. I was told the vent valve solenoid gets messed up when you over full the tank and liquid fuel hits it. There is supposed to be a revised solenoid kit that relocates it higher so no liquid will get to it. Not real high on my list of money to spend. I think the stock replacement valve is only $25 but te revised kit is about $100. Not positive on that though as it has been a long time since I checked on it.

 

[Heg87t]

Thanks Jeremy. I can't say I have found a downside yet either.

 

[eric_1984ttype]

There won't be a difference with driveability. The vent valve is the most common evap problem on most vehicles. You have to use a scan tool to operate the valve to diagnose it properly.

 

[Steve V]

Never heard that explanation,yes we replace them everyday all day commom on these trucks. Solnoid burns out...open circuit...ses light comes on. Of course no harm other than pissing off the EPA

 

[chopped39]

Thats a common failure on any gm car.I use a h4 bulb with a pigtail on in. I unplug vent and plug my bulb in and then command vent on and off. If bulb lights the circuit should be good. The vent is normally open. I have seen a few with a corroded harness where pigtail for vent comes out of main harness. hope this helps. good luck

 

[eric_1984ttype]

Never thought about using a bulb. I always use a multimeter and it almost makes it a two man job. Thanks for the idea!

 

[Heg87t]

Thanks guys. I cleared the code and it stayed off for a day and is now back on.

Where is the evap canister located?

Don't want to piss off the EPA ya know!!

 

[eric_1984ttype]

Your evap stuff usually only works between 1/4 and 3/4 tank. It should be back near the fuel tank and the vent will be attached or near the spare tire depending on weather its already had the update or not.