Transmission Problem Help
i drive on 08 e90 335i with 6AT transmission. recently i have discovered that there is a problem with my gears while driving. driving in sport mode from 1st to 2nd gear is fine, then 2nd to 3rd is fine, 3rd to 4th is fine, but once it goes from 4th to 5th gear, the car automatically revs high and it gives me the transmission malfunction alert. does anybody know what the problem is here? thanks.