You've checked (load tested) the 12V battery? The heat there will kill it. It may only need a new 12V, I replaced one on a 2011 here in Canada two weeks ago, car is now running fine. Or, it just needs the updated flash. You can do it yourself with the right software/laptop and an OBD2 dongle. The dealer should be able to do it if you provide them with the TSB number.
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