It is the electronic throttle control system. Most likely it is the throttle position sensor in the TB, which can not be replaced. You have to install a complete new/used TB. It should only be a $200 part and you can install it your self. I had the same problem on my 2010, but was fixed under warranty
Your drivetrain should be under a 5/60,000. If you still have it, it will be covered.
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