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Q: Check Engine and EVAP Code P0499 on 2006 GMC Envoy

Took my 2006 Envoy in to get the state inspection and was informed they could not perform the inspection due to the check engine light being illuminated. When the gentleman ran the Diags from the OBD it returned a P0499 error code. Can someone please explain exactly which Vent/Valve solenoid needs to be replaced? Also is this something that is relatively easy to do? Thanks
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Who ran the code and who said it was the vent valve? You have to inspect this system more that just running a code. This code means that there is an electrical problem in the vent valve circuit. The valve should be checked as well as the wiring etc. This is pretty technical stuff for a non-pro to attempt.
I took my Envoy to a Kwik-Car station to have the state inspection done (Houston, Texas). That is where the technician ran the Diag's to determine what was causing the Engine light to be triggered. Upon finding out that is was related to the fuel vapor system I started doing some research to determine precisely which part may be causing the issue. I would not say I'm an expert by any stretch but I have changed out transmissions, engines, brakes, struts, etc that is why I was hoping to be able to knock this out if it was simply a matter of pin pointing which part was causing the issue. I do appreciate the response! Thanks
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