I'm having the same problem with my 09, it had too much trans fluid added which resulted in the overheating, needs a trans fluid change.
Mine lost Communication with the trans after the change, and now we're replacing the Techm or TCM (transmission control Module).
I have the same issue. I live near some hills, it started once so I pulled over and let the engine idle but due to traffic I had to continue uphill at a fairly slow speed. The engine always runs a little hotter due to no enough air hitting the radiator but it doesn’t get too high.
now i am almost guaranteed to get the message anytime I have a long uphill climb. Fluid level seems just fine but maybe I need to get it serviced.