Looking at picking up a used one. Seller states check engine light has "been on forever". Ugh, that doesn't sound good? Says this code come up. Not sure what this is or how much to repair. Any guesses, or just call a Chevy service place. Could it not having been repaired caused damage, or just made her fuel consumption not good? (Will it screw up 02 sensors? catalytic? engine?)

She did just have the traney re-built, so seeing that as a plus.

 

I would just turn the code off, cap the solenoid, vent the line. Leave the solenoid plugged in. Mines been like that for 5+ years without issue

 

Awesome, that sounds like a rather inexpensive fix. Thanks!!

 

The canister purge valve is a $20 part and takes 10 minutes to replace, so long as you can safely jack up the back end and can slide under the back of the car. This part fails regularly on most late 2000 era GMs. I replaced it on my 2008 GMC Sierra also.

 

if it is a 2006-2007 you will need the part that comes with an adapter pigtail.

I don't know where you got that definition "canister purge valve" but it is really the "canister VENT valve control circuit". That means there is a possibility that a wire is broken/disconnected.

 

Good point about the pigtail. "Canister purge valve" comes up in parts of the Google searches for P0449 & HHR. Also if you do replace it, I'd recommend sticking with the AC Delco product. Twice I bought the one made by Standard Motor Products, once for the HHR, and years back when I had my Trailblazer. Both failed within a year. The Standard Motor part for the HHR comes with the pigtail. The AC Delco part does not, you have to buy the pigtail separate.

 

The PURGE valve is under the hood. It purges the vapors from the tank into the combustion.
The VENT valve is near the gas tank. It vents the tank so a vacuum does not form as fuel is pulled out.

Whoever wrote the titles of things didn't bother learning the mechanics of the system.