1st Gear Member
Join Date: Jan 2005
Location: Clemson, South Carolina
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it is very likely that the problem here is an computer, electronic system on the trany
BMW gearboxes are rock solid trnnys, but the electronic are not.
there a series of sensors on the tranny, so the transmission computer knows waht is going on.
i would first go under the car and ensure that all the wires are plug in, and even so, unplug them and then plug them back in, si if there was some dirt on the plgut it will help/ good time to get a contact cleaner to clean the contacts. I really think the some speed sensor on the tranny is not measuring the speed right, and is very likely because of dirt on the plug, like moisture then rust, that is creating resistance, and since many sensor work on resistance, this will give the computer wrong readout.
if everything underneat the car is clean and ok, then check so see how are the wires from the tranny up to the computer box, make sure they are not broken, etc. from under the car to the computer box, i believe there are 2 more plugs, check them too.
the reason it is very likely to be electronic is becuse you said that changing the A/m swicth does not do much. and when putting into 1 , it works, that is because there is a mechanical link between the selector and the tranny to select the postion., but the control of shifting on D is electronic.
And if after doing all this you still cannot get it, then you will have to go to the stealer, so he can pull up the transmission information....
And by the way the oil and filter can be replaced, and it is recomended once you get to such a high mileage.
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