So do we. People are not always willing to pay , what it will realistically take to truly diagnose, the problem, repair it, then verify the repair .
Quick run down, Check fuse # 23, then check for powers and grounds at the canister vent valve .
I believe there is constant battery voltage present at the can v valve( from fuse # 23 ) with the key on, then the ecm provides the ground when the solenoid is commanded on . A good scanner with bi directional controls is helpful here . Also, access to wiring diagrams
I believe , corrosion in the wire harness/ connector , near the can v valve is common , you are in the same basic climate as me, so that would be no real surprise . Look for some green powdery residue within the first few inches of the harness near the valve itself .
I actually enjoy diagnosing this kind of stuff, but it is hard to get paid for the actual time involved . I pay for access to all the wiring diagrams/repair information, , then have to actually , look everything, up, then locate components, and remove them to allow access, then connect up a scanner, volt meter, smoke machine, then listen to the customer belly ache about a 3 hour labor charge for a $20.00 part .
Or , just put a piece of electrical tape , or a picture of your grand kids over the light
I think I have seen this code cause some running problems, with a full fuel tank, or problems filling the tank , other than that, it is a non issue .