Hi everyone. This is my first post on here and it's a doozy. I recently took my 2001 Rav4 into my local Toyota garage for a problem with the transmission. It was shifting a little rough into 2nd gear once in a while and wouldn't go faster than 55 mph. Well after they diagnosed it the car came back with even more problems. The car downshifts when first gear is reving up so I can't go faster than 15mph and when I go in Reverse there's a loud thud! This all happened after they diagnosed it. Can you believe it? They said that they didn't do anything to the car that would have caused this, but who knows what they do in the garage. Anyways, I was hoping someone could tell me what could be going wrong with the transmission.
By the way they've replaced the ECM under their warranty but that didn't help at all. Since Toyota only replaces the whole transmission they won't even try opening it up to pinpoint what's exactly wrong. They also said there were no error codes showing up on the diagnostic.