Alright, just this past weekend my car's CEL went on so i pulled the code and it was a P0446A which is "EVAP VENT CONTROL MALFUNCTION". Obviously this deals with the EVAP system but what can cause this code? Is it something with the charcol canister or purge solenoid or what? If someone can help me out and point me in the right direction on trying to find out what i need to fix on my car. Any help would be greatly appreciated.

Thanks Alot
Ryan