This morning on my way to school I put my car in neutral as usual in my friends driveway and picked him up. He gets in, I put it In drive and go. Shifted into 3rd kinda hard then 4th and just completely stopped moving. Tried to use slap shift and go that way and same problem. AT light came on and pretty much was stuck going either 5mph or stopping. Is this a sign of bad transmission or just electrical problem? Or maybe the fluid needs to be changed. There was a slight fluid leak on transmission pan but it was barely noticeable and o wasn't losing fluid so idk