Hey guys so my AT light came on and went off in my Mazda 3 2010 2.0 for the first time a couple days ago. I changed the transmission fluid and it helped a little because the light came on once and then off only once. It happened 3 times the day before I changed the tranny oil. I don’t know what’s causing it? No check engine light , just AT and it’s always brief like a second on and off. What could this be? TCM , speed sensors ? Please help me .