transmission limp mode dealership BS

[evertonfc]

I have been having battery / electrical problems for years.
several times the battery was completely flat over night and threw up codes.
I reset the codes and no problems.
The last time it happened, 4 months ago I changed the battery and have had no problems since.

However the EML light came on and despite clearing all the codes it wont go out. I used a Snapon Solus pro and it was in an autoelec shop for 3 weeks being tested they found no codes either.

I took it to the dealership who are trying very hard to sell me a new car by telling me that the car has gone into "limp mode" and they are trying to figure out why.
They are trying to sell me a new car, that much is obvious.
I drove over 800 miles last week before taking it to the dealership to have the light reset so I know there aren't any problems.

I just want somebody to conirm that the dealershp can easily reset the transmission. and they are just playing games.
Thanks