There's no reset that I know of. You can either go to the dealer and let them deal with it, or you can try disconnecting the battery for 10 minutes and see if that helps.
I second this. Be warned, disconnecting the battery means you'll lose any options programmed and your trans will reset back to factory meaning it will be in learn mode so the shifts will feel awkward for a while.
Sent from my bragging iPhone using an app that encourages it.