how do I reset a gear shaped light with a exclamation point in the middle of it on 2004 BMW 325i

and my transmission is stuck in 3rd gear even in reverse no low end power. I tried disconecting battery and a code reader and no luck

Asked by for the 2004 BMW 325i
look inyour owners manual as to poss causes of light. i think you may have to see a mech to have it ck'd out