How to know if you need a new transmission?

I have a 97 Honda Prelude with a H22 doch vtec engine..the transmission is tiptronic and when i turn on the car the Drive 4 (D4) gear flashes and the engine light pops up..When i put the gear on D4 or any drive gear it hesitates to start.... and the up and down shifting when out completely..Any suggestions on what could it be?