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ZF 8HP transmission hard shifting 1-2 when cold #4505218
09/02/17 09:12 AM
09/02/17 09:12 AM
Joined: Sep 2017
Posts: 2
Europe
cristiancc Offline OP
cristiancc  Offline OP
Joined: Sep 2017
Posts: 2
Europe
I am bothered by the automatic transmission on my 2012 BMW 5. I bought the car used and although I serviced the transmission, I do not like the way it shifts.

When transmission is cold the 1-2-3 shifts make the car slow down and then lunge, they are not smooth. After a few miles of driving, the shifts are smooth, but only when in Drive mode. If I manually upshift, even at the same rpm as it's done automatically in the Drive mode the hard shift is felt again. And it's stronger as I shift at a higher rpm. 1st to 2nd gear has the hardest shifts. No errors present in INPA.

Has anyone been facing this issue?

Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505234
09/02/17 09:39 AM
09/02/17 09:39 AM
Joined: Dec 2011
Posts: 4,738
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,738
North Carolina
How many miles? You're looking at a valve body replacement.


"Zed's dead baby, Zed's dead."
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505256
09/02/17 10:03 AM
09/02/17 10:03 AM
Joined: Apr 2013
Posts: 123
-
VetteElite Offline
VetteElite  Offline
Joined: Apr 2013
Posts: 123
-
Never buy a BMW. Lease only.

Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: VetteElite] #4505271
09/02/17 10:12 AM
09/02/17 10:12 AM
Joined: Dec 2011
Posts: 4,738
North Carolina
rooflessVW Offline
rooflessVW  Offline
Joined: Dec 2011
Posts: 4,738
North Carolina
Originally Posted By: VetteElite
Never buy a BMW. Lease only.

Very helpful. Thanks for your insight.


"Zed's dead baby, Zed's dead."
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505280
09/02/17 10:22 AM
09/02/17 10:22 AM
Joined: Apr 2013
Posts: 2,327
The Northeast
mclasser Offline
mclasser  Offline
Joined: Apr 2013
Posts: 2,327
The Northeast
What ATF did you use?


2018 Hyundai Elantra VE -- 4K
2013 Honda Pilot EX-L 4WD -- 56K
2002 Honda Accord EX-L -- 211K

Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: rooflessVW] #4505291
09/02/17 10:27 AM
09/02/17 10:27 AM
Joined: Oct 2008
Posts: 19,084
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,084
Sunny Florida
Originally Posted By: rooflessVW
How many miles? You're looking at a valve body replacement.


While this is possible it is far more likely to be programming, probably needs a reflash/update...


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: rooflessVW] #4505315
09/02/17 10:56 AM
09/02/17 10:56 AM
Joined: Jul 2002
Posts: 4,388
KY
MCompact Online content
MCompact  Online Content
Joined: Jul 2002
Posts: 4,388
KY
Originally Posted By: rooflessVW

Very helpful. Thanks for your insight.


And I'd bet that "insight" is not based on owning, driving, or-most likely-even sitting in a BMW...


Mine:
2014 M235i
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505318
09/02/17 10:58 AM
09/02/17 10:58 AM
Joined: Sep 2017
Posts: 2
Europe
cristiancc Offline OP
cristiancc  Offline OP
Joined: Sep 2017
Posts: 2
Europe
The car is 110k miles. Replaced oil was dark-green but not burnt. Used ZF lifeguard 8 and new pan&filter. I did a software update at the end of 2016.
There is a difference in shift quality some minutes after the engine oil has reached the operating temperature (seeing in the dashboard). This is probably when the transmission oil gets to the right temperature.
But why would it shift bad when the oil is cold and shift better when hot?
In the winter at freezing temps, the 1-2 shifts in the first miles were violent. No sound, just the car reducing speed and then being thrown forward. The 2-3 shifts were better, 3-4 even better to unnoticeable.

Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: SteveSRT8] #4505321
09/02/17 11:00 AM
09/02/17 11:00 AM
Joined: Jul 2002
Posts: 4,388
KY
MCompact Online content
MCompact  Online Content
Joined: Jul 2002
Posts: 4,388
KY
Originally Posted By: SteveSRT8
Originally Posted By: rooflessVW
How many miles? You're looking at a valve body replacement.


While this is possible it is far more likely to be programming, probably needs a reflash/update...


Agreed, although he might also try resetting the transmission adaptation:

Press the start button once to turn on power (Don't start the engine)
Press the accelerator down to the floor for at least 5-30 sec.
Hit start button once to turn off power
Remove foot from accelerator
Wait for a minimum of 2 minutes
Start the engine and drive

It's worth a shot.


Mine:
2014 M235i
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2009 Cooper Clubman

Son's
2009 328i

Buy what makes you smile...
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: mclasser] #4505322
09/02/17 11:01 AM
09/02/17 11:01 AM
Joined: Aug 2005
Posts: 905
dayton oh
kc8adu Offline
kc8adu  Offline
Joined: Aug 2005
Posts: 905
dayton oh
most likely the wrong spec.
esp if it was done at iffy lube.

Originally Posted By: mclasser
What ATF did you use?

Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505577
09/02/17 03:54 PM
09/02/17 03:54 PM
Joined: Sep 2015
Posts: 3,861
Connecticut
69GTX Offline
69GTX  Offline
Joined: Sep 2015
Posts: 3,861
Connecticut
That's the only automatic trans fluid Bavarian Autosport sells for this car, so it should be correct (Dex VI low viscosity type fluid).

Did the car shift ok before you changed fluid or changed the program?

Fluid at normal operating temps usually give smoother shifts as the temps are optimized for the clutches. Same concept with a manual trans synchronizers. Those shift lousy when cold because the viscosity is still too high for efficient synchronizer operation. Shift at high rpm cold will certainly help shorten the life of your auto trans clutches or manual trans synchronizers. When the fluid gets too hot from hard driving, shift quality can diminish again as the viscosity can get too thin.


----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505735
09/02/17 07:17 PM
09/02/17 07:17 PM
Joined: Dec 2016
Posts: 121
Long Island, N.Y.
incognito_2u Offline
incognito_2u  Offline
Joined: Dec 2016
Posts: 121
Long Island, N.Y.
Originally Posted By: cristiancc
I am bothered by the automatic transmission on my 2012 BMW 5. I bought the car used and although I serviced the transmission......


What brand/type of fluid was used as a replacement fluid?
{my bad....I see it now...}
How is the fluid level?

Last edited by incognito_2u; 09/02/17 07:22 PM.

2006 Jeep Commander 3.7 V6 -109k (PUP/XG3600)
2006 Toyota Corolla 1.8 VVTi -77k (PPHM/XG3600)
1999 Toyota Corolla 1.8 -78k (PUP/XG4386)
1998 Toyota Corolla 1.8 -62k (PUP/XG4386)
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505749
09/02/17 07:34 PM
09/02/17 07:34 PM
Joined: Mar 2011
Posts: 402
new jersey
hemitruck Offline
hemitruck  Offline
Joined: Mar 2011
Posts: 402
new jersey
I have a ram 1500 with an 8 speed zf trans. Takees my truck about a mile, or 10 minutes to warm up and shift smoothly. I generally take it easy until trans warms up. Also similar with wife's jeep Cherokee with the ,9 speed trans.

Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: cristiancc] #4505759
09/02/17 07:52 PM
09/02/17 07:52 PM
Joined: Nov 2005
Posts: 3,228
FL
mcrn Offline
mcrn  Offline
Joined: Nov 2005
Posts: 3,228
FL
Did the shifting change as soon as the service to the transmission was done?


2012 Nissan Rogue
Re: ZF 8HP transmission hard shifting 1-2 when cold [Re: rooflessVW] #4507479
09/04/17 06:47 PM
09/04/17 06:47 PM
Joined: Apr 2004
Posts: 832
Indiana
nascarnation Offline
nascarnation  Offline
Joined: Apr 2004
Posts: 832
Indiana
Originally Posted By: rooflessVW
How many miles? You're looking at a valve body replacement.


I'm confused by this statement.
Typically wear (increased valve to bore clearances) causes problems when the fluid is hot and thin (leakage), not cold and thick.
Can you elaborate on what wear issue causes this?

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