Hey next gen.That mechanism in the trani that adapts to your driving style can be reset. Look it up in the forums. I believe u turn they key to 2, then press the gas pedal to the floor till u hear it click. Let it go and then start the car, and it's reset. This may fix your problem.

Thanks for the suggestion, I guess it doesn't hurt to try. I'll check to see if the problem is even there before I do it. If the problem is there and the reset fixes it then I wonder why the BMW tech didn't think of it? :dunno:

I've been experiencing a similar issue as well. I feel that while driving along, say at 35mph or 40mph (or any speed for that matter above 30) and there is this little lag; feels like someone hit the rear brakes for a split second and the car slows and speeds back up. On several occasions it does sound like a bang. I've had my transmission software reprogrammed a year ago. I've done the adaptation reset numerous times but this returns. I do have extended warranty but it doesn't always do it and I'm not sure what the dealer will or won't do. Anyone else had similar and then have trans fail or replicated with service dept and have it replaced? Not sure what to do...

I have not been able to recreate the hard bang. Actually I haven't been able to do it since the software was updated back in 2006. The pause is still there though. I haven't tried to reset the trans adapt as mentioned before. I'll give that a try next. At the end of the day I can live with this pausing as long as the trans does not go out because of it.

I have the exact same problem on my 05 4.4i. The dealership ran a diagnostic on it and said all they needed to do was re-program the computer and it should be fine. They told me they have had this issue before and this fixed it. I'll let you know how it works out once its done.

Finally got mine to exhibit this behavior for the mechanic and is diagnosed as the Mechatronic module. It's $3,000 for parts and about $1,000 to replace. They are calling the extended warranty company today (was Security National which is now bankrupt and is now administered by Royal) to get it authorized for repair. Crossing my fingers and toes...

I had this problem in my 2005 4.4i and they tried the flash, which didn't work and then they also said they couldn't duplicate it. I had no problem duplicating it so I made sure to take a tech with me and show him the problem. BMW ended up replacing my transmission. I would seriously push this issue.

Also, if you do a search on the forum "rough downshift" you will see that you are not alone in this. Hope this helps!

i just tried it, my X5 and 523i does not do it, but surprise surprise my Volvo S80 DID it and put me on REDUCED PERFORMANCE mode lol

i had a problem just like that. only happened when i more aggressively hit the gas. turned out i had a busted motor mount.

I hate stealerships for just this reason. Why can't they just believe us sometimes? They get reimbursed, so why in the hell do they care?! How many tires on Ford Explorers had to explode and kill people before the manufacturers owned up. I'd be there every damn day saying it happened if I know it's going to save my thousands of dollars in the end.