Transmission kick/jerk b/t 1st and 2nd under load

[petrosar]

Has anyone out there experienced a hard shift b/t 1st and 2nd when under 1/2 to 3/4 throttle load? This usually happens more often when the car is in the first 10 min of driving.

I have taken it to the dealer and they always come back with "unable to duplicate error". I even took a technician out once to test drive myself but the car didnt do it when he was with me.

Someone told me this is serious... another one said its a software upgrade for the TCU.

I just bought the car off my lease and its an 05 3.0 with 45k miles. Everything about the car is overall cherry but this is bothering me.

Any advice is greatly appreciated!

[ripp222]

My 2004 X5 4.4i has a harsh shift from 1 to 2 whenever the transmission isn't warmed up (which is almost always).

I've had the transmission EGS unit updated per SI B 24 01 06 (X5 4.4i/4.8is with 6HP26 from 10/03 up to 08/05)

The Dealer just says it's the "warm up program"... I still don't like that shift, but at least it only does it once / drive cycle...

Maybe there is a SIB for your tranny?

[Weasel]

Sounds like the harsh shifting problem is when the fluid is still cold, thus thicker viscosity. A software update would change some of the shifting parameters and reset the adaptations. You should be able to reset the basic transmission adaptations yourself. Turn the key on leaving engine off and press the gas pedal all the way down past the downshift click point and hold it for about 30 seconds. You may hear the transmisswion making some noises at this time which would be solenoids operating and such. After that the shifting adaptations should be reset and will re-learn to your driving style when you drive it again.

Good luck and hope that works for ya!

[petrosar]

Thanks for the info. I will definitely give it a try and give an update.

One question I had about the learning of the driving patters... do you know approximately how long it takes the car to complete this or is it an ongoing learned type of software where it constantly is learning say the last few miles of driving.

Thanks!

[Whitecat]

Originally Posted by Weasel

Sounds like the harsh shifting problem is when the fluid is still cold, thus thicker viscosity. A software update would change some of the shifting parameters and reset the adaptations. You should be able to reset the basic transmission adaptations yourself. Turn the key on leaving engine off and press the gas pedal all the way down past the downshift click point and hold it for about 30 seconds. You may hear the transmisswion making some noises at this time which would be solenoids operating and such. After that the shifting adaptations should be reset and will re-learn to your driving style when you drive it again.

Good luck and hope that works for ya!

Hello Weasel, same thing here, i've tried your reco i.e "Turn the key on leaving engine off and press the gas pedal all the way down past the downshift click point and hold it for about 30 seconds. You may hear the transmisswion making some noises"......i've got absolutly no sound of nothing when i did the procedure.....the kick happend only at cold start once...all good after

Is there something i'not doing right ? Key is on , engine off, press gas all the way 30sec.
Or go with Ripp222 option and go to rhe $tealers for adaptation value reset ?
Tx

Thanks

[ChesapeakeX5]

My 06 4.4i did the hard slam into 2nd, or sometimes if only in 2nd and slowing to a stop it'd slam into 1st. Only when car was cold.

Throttle adaptation procedure was the cure for me. I could hear a click sound when doing the adaptation, but it may have been a bit longer than 30 seconds. The slam would reoccur 4 to 6 months later, then I'd just do the adaptation and all would be good for another 4 to 6.

At ~60k, I changed transmission fluid (Lifeguard 6 for my machine) and it really made a difference in the shifting during acceleration, much crisper. However, I'd still get the low gear slam. The only thing that worked for me was to do throttle adaptation. I never had the dealer attempt to service as I'm sure I would have gotten the "can't replicate" response (great at taking quarters from my change holder during service, but lousy at actually fixing things).

[BigBlack48is]

Originally Posted by ChesapeakeX5

My 06 4.4i did the hard slam into 2nd, or sometimes if only in 2nd and slowing to a stop it'd slam into 1st. Only when car was cold.

Throttle adaptation procedure was the cure for me. I could hear a click sound when doing the adaptation, but it may have been a bit longer than 30 seconds. The slam would reoccur 4 to 6 months later, then I'd just do the adaptation and all would be good for another 4 to 6.

At ~60k, I changed transmission fluid (Lifeguard 6 for my machine) and it really made a difference in the shifting during acceleration, much crisper. However, I'd still get the low gear slam. The only thing that worked for me was to do throttle adaptation. I never had the dealer attempt to service as I'm sure I would have gotten the "can't replicate" response (great at taking quarters from my change holder during service, but lousy at actually fixing things).

At 100k I changed my filter / fluid with Redline D4 and it made a HUGE difference in the crispness of the shifts. I couldn't agree with you more about resetting the adaptations. I do it with every oil change

[Whitecat]

Originally Posted by ChesapeakeX5

My 06 4.4i did the hard slam into 2nd, or sometimes if only in 2nd and slowing to a stop it'd slam into 1st. Only when car was cold.

Throttle adaptation procedure was the cure for me. I could hear a click sound when doing the adaptation, but it may have been a bit longer than 30 seconds. The slam would reoccur 4 to 6 months later, then I'd just do the adaptation and all would be good for another 4 to 6.

At ~60k, I changed transmission fluid (Lifeguard 6 for my machine) and it really made a difference in the shifting during acceleration, much crisper. However, I'd still get the low gear slam. The only thing that worked for me was to do throttle adaptation. I never had the dealer attempt to service as I'm sure I would have gotten the "can't replicate" response (great at taking quarters from my change holder during service, but lousy at actually fixing things).

Thanks man i will give another try tonight with more than 30sec...hope it will works...i will re- post the output of it...as for the tran fluid, mine is original...life time debate on do or not do...and now, not sure what to do ?

[ChesapeakeX5]

Originally Posted by Whitecat

...as for the tran fluid, mine is original...life time debate on do or not do...and now, not sure what to do ?

My advice, along with that of many others on the forum, Change It !!!

If you have the ZF, they as the manufacturer have recommended fluid & filter changes. ZF doesn't call it lifetime. BMW calls it lifetime, but their view of lifetime is rather short. The margins on service work are typically pretty good .

You will find some who get concerned on changes if the fluid is original and the vehicle is high mileage. I changed mine at 60k and the results were great.

Make sure you get the correct fluid. thectsc.com is a good source based on my experience. bavauto.com is another.

[Whitecat]

Originally Posted by Whitecat

Thanks man i will give another try tonight with more than 30sec...hope it will works...i will re- post the output of it...as for the tran fluid, mine is original...life time debate on do or not do...and now, not sure what to do ?

YES it works !!! You guys are Rock star :-))