My experience says the "Check Engine Light" has nothing to do with the transmission! Exactly why did you think it was a tranny problem? newer vehicles with computers will tell you if you have a tranny problem but as far as I know you only know a tranny problem from feel.
And i have never heard of transmission squeak sound in my life. Most check engine lights come on because of a faulty sensor like an oil pressure or oxygen sensor and many many more now days.
As far as over filling the tranny. Did you check the level with the engine running and warmed up?
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