4.8is transmission journey from broke to ballin'

[AV8R4AA]

I'm having some rough downshifting problems.
Mainly very slow speed 2/1. Have ZF 6 transmission fluid and a filter on order.

Could someone explain the software update.
Where do I go to get that done?

I was wanting to take my BMW to a specialized ZF center.
Looked but no luck finding a ZF repair in the area.
A lotta guys named Bubba say they can "fixer up"

[bvbazel]

Originally Posted by AV8R4AA

I'm having some rough downshifting problems.
Mainly very slow speed 2/1. Have ZF 6 transmission fluid and a filter on order.

Could someone explain the software update.
Where do I go to get that done?

I was wanting to take my BMW to a specialized ZF center.
Looked but no luck finding a ZF repair in the area.
A lotta guys named Bubba say they can "fixer up"

you are she can go to your BMW dealer and tell them that you want to have all your software updated including your transmission module software some people update only transmission module software but keep in mind that the engine computer is communicating with transmission computer so therefore is better to update both of them since stay eliminate some of the glitches that were existing prior to that my dealer charged me $150 to update all the computer system and transmission module as well trust me it Is worth it if you changing the fluid and the filter you might as well look at the previous posts and spend additional 70 bucks to purchase some of the rubber seals that are between transmission and the gearbox overtime they getting hard her and are not keeping the pressure okay transmission fluid that is essential to your gear switching I just purchase rubber seals including the electric connector sleeve I had similar issues to yours my parts are coming on Friday I will most likely do this over the weekend thank you to you guys posted so far others had great results after changing the rubber seals between the gearbox and the transmission

[bvbazel]

[IMG][/IMG]

Originally Posted by AV8R4AA

I'm having some rough downshifting problems.
Mainly very slow speed 2/1. Have ZF 6 transmission fluid and a filter on order.

Could someone explain the software update.
Where do I go to get that done?

I was wanting to take my BMW to a specialized ZF center.
Looked but no luck finding a ZF repair in the area.
A lotta guys named Bubba say they can "fixer up"

[bvbazel]

So I have my update I have changed all seals in the transmission including new fluid and filter after test drive same problems occurred to first gear when turning right was holding longer and when accelerating it felt like something is holding the car back and then to fail safe transmission light went on so I decided to bring it to BMW dealer to have it all software to be updated including transmission module software is well when doing that they discovered that the DSC module was faulty lucky for me I have blame them that they had damaged their module when upgrading the software they told me the replacement of the DSC module will be $1700 I refused to pay for it and told them that they had damaged the module and they had to replace it for free after short fight that's what they did they replace the module and updated the software after test drive I have discovered that the transmission is switching gears smooth and I have no more issues when accelerating so guess the issue was the D.Sc. Module since now the car is running like new. I hope this will help some of you out there who have same issue as I had it felt good having for once do either paying their own price to fix my car for free

[Junkycosmos]

Hi Bvbazel,
Do you know or have receipt of which dsc module they replaced ? Was it the computer for dsc or maybe the yaw sensor module ? Any part numbers or mention location on what they took apart (dsc behind driver headlight?) or yaw sensor under center console or something in the actual transfer case under car?

Regardless so glad to hear you are back in business 'Ballin' !
J

[X53Jay4.8is]

Originally Posted by bvbazel

So I have my update I have changed all seals in the transmission including new fluid and filter after test drive same problems occurred to first gear when turning right was holding longer and when accelerating it felt like something is holding the car back and then to fail safe transmission light went on so I decided to bring it to BMW dealer to have it all software to be updated including transmission module software is well when doing that they discovered that the DSC module was faulty lucky for me I have blame them that they had damaged their module when upgrading the software they told me the replacement of the DSC module will be $1700 I refused to pay for it and told them that they had damaged the module and they had to replace it for free after short fight that's what they did they replace the module and updated the software after test drive I have discovered that the transmission is switching gears smooth and I have no more issues when accelerating so guess the issue was the D.Sc. Module since now the car is running like new. I hope this will help some of you out there who have same issue as I had it felt good having for once do either paying their own price to fix my car for free

I had the abs/dsc module fail. The symptoms were a trans fail safe message then with the scanner it showed one speed sensor out on front left and one speed sensor out rear right. Highly unlikely both would be out tested further and found no reading of speed sensor on right rear circuit. Sensor was good abs/dsc fault. Changed out the module all is good again.

[amancuso]

My 4.8is has the cold 1-2 shift bump issue as well as strange quick shifting when in D mode. No error messages, etc. If I let the car warm up for 3 minutes before driving, there is no 1-2 bump. I plan on having the fluid drained and filled as well as the sealing sleeve and "adapter" changed in a week or 2. I'll also have the transmission programming checked as well. Does anyone know what the proper up to date file for the transmission programming should be?

[bcredliner]

Can't help you on programing the transmission. I suggest that when the pan is pulled to change filter you also change the temperature harness as preventative maintenance. I know only enough about transmissions to be dangerous. Suggest you search transmission threads for solutions to your problem. IMO there are very few members that know enough about transmissions to sort through what can be several causes for the same symptoms.

[Junkycosmos]

Just make sure the fluid is not low. I cannot prove it but I suspect that 90% of the transmission issues with this car are due to low fluid. It’s common these trans loose a little bit due to the side seals, open vents, so many heating ans cooling cycles. Then we know they act horribly when the fluid is even slightly low. Heck, take hot fluid, put it in a cold tranny and the fill level will be low or better yet do a fill on non level ground.

Yes the trans parts wear but the miles at which they wear are double what is going on in these units hydraulic wise. Key is to remember these transmissions are hydraulic driven for all they do. Without proper hydraulic pressure (low fluid, poor pressure seal) the transmission cannot function properly. Then take the amount of forces at play (weight and torque) you quickly burn up the mechanics.

Way too many trans are “diagnosed “ as failed clutches: I call bs, you don’t burn up clutches unless they aren’t shifted right (electrics and hydraulics).

[Junkycosmos]

Originally Posted by bcredliner

Can't help you on programing the transmission. I suggest that when the pan is pulled to change filter you also change the temperature harness as preventative maintenance. I know only enough about transmissions to be dangerous. Suggest you search transmission threads for solutions to your problem. IMO there are very few members that know enough about transmissions to sort through what can be several causes for the same symptoms.

Agreed ..

drop pan,
new filter (BMW parts counter)
drop valve body (its easy if you can drop your pan you can do it)
New metatronic seal (round electrics plug seal)
valve body seal , 4 tubes within trans (BMW)
new trans temp harness
refill with correct fluid
get the fill level correct

maybe go route of the programming updates after that ...