Mechanic Q: Transmission?

My transmission seems to slip every now and then. Do I need to have the fluid change? if something is wrong with the transmission my service engine light should come on correct?

Mechanic Q: Transmission?

My transmission sometimes feels like it is slipping, I have 33,000 miles on my Ford Edge should I have the fluid changed? my check engine light would come on if something was wrong with the transmission correct?