gmtech121

Not disagreeing with you in the least as far as shady characters go. I've been doing this 26 years and I've seen all kinds. I have a pretty good crew these days though. All I was suggesting is the $100 in my shop is for a soup to nuts diagnostic. I do have to add though if I were running up to the service drive for everyone that wanted a code pulled... or a quick check, I'd be up there all day for nuthin and be living under a bridge. Gm has always had handhelds up until 2010. It takes me 20 minutes just to get Global Diagnostics fired up and pull a code out of a Camaro! Cheers.

A p0449 is a vent solenoid "circuit" dtc (not a performance code) and cannot be caused by a purge valve. A p0446 is for purge detected when none commanded and is generally caused by a stuck open purge valve. It can also be caused by a failed fuel tank pressure sensor but that isn't very common. P.S. I have never charged anyone $100 to "pull a code". I charge to accurately diagnose their vehicle. I'm not saying there isn't a problem with vent solenoids as there is but you really shouldn't bash the tech. Just like whatever you guys do for a living, there are good ones and bad ones.