It could be several things.
Leaky gas cap is one; make sure the threads on the cap and filler neck are clean and the o-ring is in good shape. A very little bit of grease on threads and o-ring may fix it long enough to get your inspection. Check all hoses and fittings for cracks, breaks, disconnection, etc.
Using any of the major search engines, use "P0447" as your search string. Many of the hits will have troubleshooting info.
Or download the FSM (link in sig) and it will have troubleshooting procedures.
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