Check engine light on

What is your question?

The check engine light in my 1999 escort lx keeps coming on. A diagnostic test revealed that there was ' Transmission slipage ' or that the fluid may be low. The fluid is fine, and there is NO NOTICEABLE slipping. Every once in awhile, there is a slight hesitation, like when speeding back up after slowing down. It shifts through the gears just fine, only jerking slightly when the car is very hot. I am at a loss.... any advice?