The car needs to be perfectly level. You need to run the ATF to achieve a specific temperature range. THEN add fluid until it just drips out the hole.


Adding too much or too little can cause the trans to enter a failsafe.


BMW software like inpa or ista.


We are shooting in the dark here- it really is going to need some careful digging on your part. Id look to see if there are any tranny error codes...then carefully check the fluid level again...and then, if it still a problem, drop the solenoids and look to see if you dislodged something, got an oring wrong, etc


Sorry.....