Yes it's true....Another transmission thread

[amacman]

I am not convinced about replacing the torque converter or valve body as a fix
Hit Redline and others have gone down that route to no avail .
Patrick Irish may , as he says , have reset the computer by having power disconnected for a time , others tell a similar story .
I have no idea , of course , how serious the issue is on your car but think back a week or so to where I said I also have slight hesitation but only when A/C is on .
I think these cars have , for want of a better expression , electronic tantrums sometimes .
maybe it`s bad signals caused by a bad connector .
a buddy of mine had issues with a ZF transmission on a VW going into failsafe mode and no one could find any problem .
I simply asked him some questions about the when and where it happens , turns out he drives through puddles whenever it rains so a clean up and grease up of some connectors and it`s good as new for a while but he won`t stop driving through puddles .
he drives high miles in his job so a few months later the problem is back .
anyhoo , just saying , cool yer jets and look at the simpler solutions before you spend a lot of cash .
good luck .

[4MoJoe]

Dinan E39 - symptoms sound like the mechatronic module. Search for that here. I had mine replaced last fall and it took care of the similar issues I was having.

[Roadkill]

^ great, thanks for the info.

[Jordo]

Originally Posted by dinan e39

^ great, thanks for the info.

Your 04 has a completely diffrent trans than our 2000 - 2003 models..... Correct?

[Roadkill]

Yes, 6spd vs 5spd.

[Wrscott]

Originally Posted by dinan e39

Just when I thought I had escaped a faulty tranny, problems are now rearing their ugly heads. The car is a 2005, 4.4, 57K miles with updated tranny software. The symptom is as follows: Driving on flat roads around 30-35 mph at roughly 1000-1200 rpm, the transmission jerks as if it is attempting to shift. The jerk is very quick almost like the motor is missing. As soon as you apply a little throttle it goes away. I haven't completely ruled out the motor but it feels as if it is generated from the middle of the car. Any others have this happen? Any diagnosis? TIA.

Had the same issue on my 05 4.4 at around 58-60K miles. Had issues recreating the problem with the tech, but they did note it. It got worse and finally the tech was able to feel it. Dealer replaced tranny under good will. Phew that would have cost a lot out of warranty.

[Roadkill]

^, if I could only make this happen! was the car CPO or did you have an aftermarket warranty?

[Wrscott]

I got lucky... car is not CPO and no warranty. I complained about it for about 1 year and finally the tech was able to recreate the issue. Decent folks here at Schomp BMW in Denver. They did tell me this was the last good will they will do for me, of course it was a big one. It's the way you go about it to get them to take care of things outside of warranty.

[Weasel]

Late entry to this thread, but here's a couple ideas and some things to try.

From the sound of it in the OP it could be either the torque converter circuit or even possibly the transfer case.

Some quick things to try...
If it is in the transfer case you can simply unplug the VTG motor on the case to prevent it operating the internal clutch pack. This will cause the 4x4 and DSC warning lights to come on, but that is just part of diagnosing.

Since it seems to do it under certain circumstances/speeds while driving, get it doing it then shift into sport mode. This changes the speed and parameters for the torque converter lockup clutch operation. If it stops doing it at that speed and you gotta drive faster to get to the same feel then you confirmed that it is in the TC lockup circuit, which is usually cured with the mechatronics replacement. (mechatronics = transmission control module built on to the valve body on 04 and up V8 X5s)

[Jordo]

Will this same trick work for my 2002?