[moderat0r]

hi,
323 E90 2010 N52 183000km or 113710 MILES

I am noticing these symptoms with automatic transmission, I believe its GM transmission.

when in low speeds, I feel the gears are shifting upwards or downwards depending on the speed, gear 1 to 2 shift is very noticeable and jerky though very little jerk.


Neither myself nor anyone has done anything to transmission in last couple years

I am wondering whats going on, is this normal or I am in trouble?

what is the fix, if I am in trouble?

Thankyou!

[crashoverride]

You are due for a Fluid change at that mileage.

Occasionally resetting the adaptations as the transmissions learns your driving and can learn bad habits too so sometimes resetting helps.

Finally yes this is normal don't freak out.

[mainbearing]

You can try fluid and filter change first. There is also a chance the flimsy pressure switch discs are torn. However you will have to drop the valve body to fix those. If you do drop the valve body, might as well put in a Sonnax Zip Kit.

Torn pressure switch discs:

My notes on pressure switch discs:
https://www.e90post.com/forums/showp...6&postcount=12

Regarding the Zip Kit:
https://www.e90post.com/forums/showt...php?p=23304080

6L45 ATF and filter DIY:
https://www.e90post.com/forums/showthread.php?t=573490

Other members' ATF tips:
https://www.e90post.com/forums/showthread.php?t=1257476
https://www.e90post.com/forums/showthread.php?t=1918057

[lordnikon]

I noticed shifts can be a bit rough when cold. I have already done the transmission fluid and filter change.

[mainbearing]

Looking back at my notes, the rough shifts were worse when cold. The pressure switch discs solved them to this day. I am not sure if yours are the exact same problems as I am not a transmission expert, but sounds similar.

Except mine were 1-2, 2-3, 3-4 shifts because of that left-most pressure switch failure. From what I understand, that switch controls Clutch 1-2-3-4 and probably was why. Just guessing anyway.

[StradaRedlands]

Originally Posted by mainbearing

You can try fluid and filter change first. There is also a chance the flimsy pressure switch discs are torn. However you will have to drop the valve body to fix those. If you do drop the valve body, might as well put in a Sonnax Zip Kit.

Torn pressure switch discs:

My notes on pressure switch discs:
https://www.e90post.com/forums/showp...6&postcount=12

Regarding the Zip Kit:
https://www.e90post.com/forums/showt...php?p=23304080

6L45 ATF and filter DIY:
https://www.e90post.com/forums/showthread.php?t=573490

Other members' ATF tips:
https://www.e90post.com/forums/showthread.php?t=1257476
https://www.e90post.com/forums/showthread.php?t=1918057

Treasure trove of information here... bookmarked!!!

[moderat0r]

Originally Posted by lordnikon

I noticed shifts can be a bit rough when cold. I have already done the transmission fluid and filter change.

did that help after fluid and filter change?

[lordnikon]

Originally Posted by moderat0r

did that help after fluid and filter change?

I see no difference in shifts. I changed the fluid for peace of mind.

There is debate about whether to reset the adaptations after just a fluid change. I didn't.

I would reset it only if I've done the solenoids, valve body and sleeves though.

[mainbearing]

I have never reset the adaptations after fluid or filter changed. In fact, not even after my pressure switch fix! Everything seemed to work fine, as it will adapt to new conditions by itself, so I thought. Maybe it would work better with a reset? I do not know.

[moderat0r]

Originally Posted by mainbearing

I have never reset the adaptations after fluid or filter changed. In fact, not even after my pressure switch fix! Everything seemed to work fine, as it will adapt to new conditions by itself, so I thought. Maybe it would work better with a reset? I do not know.

what is the exact procedure to do adaptation reset on 323 2010 e90?

[bmwbob89]

Change the fluid and filter with some shudder fixx and see if that helps. Don't reset adaptations unless some hardware for the trans has been replaced.

[moderat0r]

there is definitely improvements in jerks, like 75% less jerks.

i only changed oil and filter

Gear shifts have become now fading shift not jerky

i measured the total amount of oil which came out and put same amount and at the same time, i over filled it until it started dripping.

the only concern i have is gasket which came with kit, it not like OEM i hope its ok though i have put it already:/

how do I reset transmission adaptations on this? is it only by inpa or there is a manual procedure as well?

[E90Dom]

My fluid was pretty dirty, but that gasket doesn't look great ...

Hopefully it doesn't leak