Are you actually having issues with driving the vehicle? Or are the codes just showing up? If codes are just showing, have them reset and see if they come back. If you are having issues with your transmission with these codes, then yes it is an internal failure and the tranny needs rebuilt or replaced (recommended). The price difference is simply the fact that it is the major dealer. The only benefit that MAY be there is that they built the car so they "supposedly" know the car better than any other mechanic. I don't really believe in that though.. If both offer you the same warranty then I suggest going with the tranny shop over the Honda dealer, that is if the tranny shop has a good reputation of course.
Make sure that you are getting a new transmission for the replacement at the tranny shop (if that is what you want). That could make a big difference in pricing as well, if the Honda dealer quoted with a new tranny and the repair shop quoted with a used tranny.
You should read about how to avoid car repair rip offs at http://www.2carpros.com/kpages/avoid_car_repair_rip_off.htm
Hope this helps..
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Friday, January 9th, 2009 AT 8:24 PM