[NJQG]

I was driving home on the highway at about 75. The gear icon and transmission malfunction popped up on the i drive briefly and went away.When i got off the highway the car down shifted normally. Then when i went to accelerate again trans popped straight into 6th with the warning light on. The car is FBO and running xhp. I used xhp to pull the code and its showing as 0x420022 EDS B short circuit to positive. Any one ever have a similar issue. Also to note i never had any issues prior trans shifted fine and smooth. Thanks any input is definitely appreciated.

[BurrNinja]

If you remove xhp flash does it occur?

[NJQG]

Originally Posted by BurrNinja

If you remove xhp flash does it occur?

Yea it still happens. I tried completely removing xhp, but no change.

[dzz]

Originally Posted by NJQG

I was driving home on the highway at about 75. The gear icon and transmission malfunction popped up on the i drive briefly and went away.When i got off the highway the car down shifted normally. Then when i went to accelerate again trans popped straight into 6th with the warning light on. The car is FBO and running xhp. I used xhp to pull the code and its showing as 0x420022 EDS B short circuit to positive. Any one ever have a similar issue. Also to note i never had any issues prior trans shifted fine and smooth. Thanks any input is definitely appreciated.

I assume this is auto ZF 8 speed? How many miles? Have you changed transmission fluid, pan & filter so far?

[OnlyGerman]

Get codes checked. How long have you had the tune on it. These zf8 are pretty reliable.

[NJQG]

Originally Posted by dzz

I assume this is auto ZF 8 speed? How many miles? Have you changed transmission fluid, pan & filter so far?

Yea its the zf 8 speed. Its just crossed over 100k the previous owner listed it as 1 of the things he did right before selling it. Of course there is no way for me to actually verify if he did or not.

[beegeezy]

It appears that "EDS B short circuit to positive" is a solenoid code from the mechatronic (valve body) unit. It could be a faulty or dirty solenoid. You could try removing the mechatronic and carefully clean it, especially the solenoids. If I were bothering to remove the mechatronic unit I would also install this: https://www.sonnax.com/parts/4590-zip-kit

[BrandBMW]

Originally Posted by NJQG

Yea its the zf 8 speed. Its just crossed over 100k the previous owner listed it as 1 of the things he did right before selling it. Of course there is no way for me to actually verify if he did or not.

Or to verify that the previous owner used the correct fluid. Incorrect fluid could affect solenoid function. A good affordable first step would be to do a filter and fluid change with the correct ZF8 fluid to see if it improves the condition. If it doesn't, then you have a better understanding that the valve body may need to be dropped.

[NJQG]

Thanks I went ahead and ordered the trans fluid kit from fcp euro. Hopefully that will do the trick.

[Trainwreck914]

Just FYI. It only takes about 4 qts. The kit comes with 8.

[khanmohammed]

Originally Posted by NJQG

I was driving home on the highway at about 75. The gear icon and transmission malfunction popped up on the i drive briefly and went away.When i got off the highway the car down shifted normally. Then when i went to accelerate again trans popped straight into 6th with the warning light on. The car is FBO and running xhp. I used xhp to pull the code and its showing as 0x420022 EDS B short circuit to positive. Any one ever have a similar issue. Also to note i never had any issues prior trans shifted fine and smooth. Thanks any input is definitely appreciated.

Welcome to the brand of bmw my friend

[BurrNinja]

Originally Posted by Trainwreck914

Just FYI. It only takes about 4 qts. The kit comes with 8.

Mine took a few more, just have to make sure car is running and went through gears and top off till it starts dripping then plug it. I used the liqimoly kit no issues.

[BMW535iva]

check out the thread it may help you.
https://f10.5post.com/forums/showthread.php?t=1652022

[BurrNinja]

MAKE SURE TO LOOSEN FILL BOLT BEFORE ANYTHING. When i loosened mine that bad boy was still torqued on since car was new it was tough.

[NJQG]

Originally Posted by khanmohammed

Welcome to the brand of bmw my friend

This will make my 7th bmw just 1st to ever have any kind of trans issue. But thanks for the welcome much appreciated

[NJQG]

Originally Posted by BurrNinja

MAKE SURE TO LOOSEN FILL BOLT BEFORE ANYTHING. When i loosened mine that bad boy was still torqued on since car was new it was tough.

I watched like 5 YouTube videos and dowloaded a PDF with the instructions. So Im ready, nervous but ready.
1 question though maybe some one can help with. In all the videos it says to shift through the gears. My problem is that my trans will only allow 6th. I can delete the code through xhp and MHD. But it pops back up.

[khanmohammed]

Originally Posted by NJQG

This will make my 7th bmw just 1st to ever have any kind of trans issue. But thanks for the welcome much appreciated

I had a 2006 BMW 550i and the whole engine was rebuilt at 120k and then the tranny finally failed at 140k

[BurrNinja]

Originally Posted by NJQG

I watched like 5 YouTube videos and dowloaded a PDF with the instructions. So Im ready, nervous but ready.
1 question though maybe some one can help with. In all the videos it says to shift through the gears. My problem is that my trans will only allow 6th. I can delete the code through xhp and MHD. But it pops back up.

It will be fine going to 6th, as long as its topped off. Keep car running when topping off.

[NJQG]

Originally Posted by BurrNinja

It will be fine going to 6th, as long as its topped off. Keep car running when topping off.

Fcp says to shift through the gears. What i mean is that when i start the car and go to drive it goes strait to 6th. No 1st through 5th. Are you saying this is ok ? As long as it gets topped off according to the other steps. Thanks for the help.


Start engine
Put foot on brake
Shift transmission into "R" and "D" continuously
Shift transmission in manual mode from 1st to 3rd and hold gear for 3 seconds
Shift transmission in manual mode from 1st to 4th and hold gear for 10 seconds
Select all gears in manual mode from 1st to 8th and hold gear for 10 seconds
Keep engine speed at 2000 RPM's to ensure torque converter fills with fluid
Check temperature and verify that fluid temp is between 30°C and 40°C

[Surly73]

Originally Posted by NJQG

Fcp says to shift through the gears. What i mean is that when i start the car and go to drive it goes strait to 6th. No 1st through 5th. Are you saying this is ok ? As long as it gets topped off according to the other steps. Thanks for the help.


Start engine
Put foot on brake
Shift transmission into "R" and "D" continuously
Shift transmission in manual mode from 1st to 3rd and hold gear for 3 seconds
Shift transmission in manual mode from 1st to 4th and hold gear for 10 seconds
Select all gears in manual mode from 1st to 8th and hold gear for 10 seconds
Keep engine speed at 2000 RPM's to ensure torque converter fills with fluid
Check temperature and verify that fluid temp is between 30°C and 40°C

You can only do what you can - make sure you get the R and D part.

FYI - the "foot on brake" part seems to be in question. Some of the instructions from ZF seem to have the wheels needing to spin. For what it's worth, a ZF8 that's stationary will only allow you to select R, 1 and 2 so without releasing the brake there will be nothing above 2 for 10 seconds.

FWIW - ISTA+ has a full procedure telling you what to do and keeping the temperature reading on the screen at the same time. Just keep clicking NEXT and it lays it all out.

If you're in full limp mode, stuck in 6th, personally I don't have a high degree of confidence that a fluid drain/replace is going to solve the issue without at least taking something apart in the mechatronic and cleaning it. I'll be tuning in for your updates though.

[NJQG]

Originally Posted by Surly73

You can only do what you can - make sure you get the R and D part.

FYI - the "foot on brake" part seems to be in question. Some of the instructions from ZF seem to have the wheels needing to spin. For what it's worth, a ZF8 that's stationary will only allow you to select R, 1 and 2 so without releasing the brake there will be nothing above 2 for 10 seconds.

FWIW - ISTA+ has a full procedure telling you what to do and keeping the temperature reading on the screen at the same time. Just keep clicking NEXT and it lays it all out.

If you're in full limp mode, stuck in 6th, personally I don't have a high degree of confidence that a fluid drain/replace is going to solve the issue without at least taking something apart in the mechatronic and cleaning it. I'll be tuning in for your updates though.

Is it actually possible to clean the solenoids without replacing them. Reason I ask is I can't seem to find where to buy replacements. I've been doing some research and I've found which solenoid I think is the problem. Number 6 in the pic.

[Trainwreck914]

Bmw535iva posted a link to the rebuild kit. They are also available already remanufactured on eBay