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Could be an issue with the wiring harness preventing the purge valve from activating. Need a scan tool that can activate the valve.
The canister vent valve is different from the purge valve. The vent valve is located under the vehicle near the EVAP canister. It's going to require some good EVAP system troubleshooting to locate and repair the problem. The problem could be in the wiring, hoses, or canister itself.
 

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Okay thanks guys!. It has been getting frustrating. I am gonna do a freeze frame when I go to clear the code , apparently that will tell me how its affecting the vehicle ?
Here's an interesting article about the vent valve, how it works, and troubleshooting on other makes: EVAP Vent valve (solenoid): how it works, problems, testing. You might find the information helpful. A scan tool (not just a scanner) would certainly be useful for troubleshooting the problem. You can find Acadia-specific information in the service manual. Several service manuals are available for download in another part of the forum. Fortunately, few if any changes have been made to the EVAP system during run of the Lambda platform, so troubleshooting guides in either the 2010 or 2013 manual should be similar.
 
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