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  #11  
Old 04-12-2017, 05:55 PM
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UPDATE 4-13-2017:

The error came again while I was going on a short trip, I pulled over, restarted the car-error cleared and drove off. However, the transmission malfunction came right back after 1 min. This time, the Gear Selector Malfunction appeared which wouldnt clear, gear lever was dead. Car had to be towed back to the Service center...Unreal..

Tried to fix: Changed gear selector unit, changed transmission oil and all respective seals, the adaptations were also reset. All work was performed by bmw professionals.


Today: After 250 km since the service of no error messages, the error appeared again.
It only appears after driving a considerate amount of time (1-2hours straight) and while going at steady speed. All 4 times that this error popped up, the same conditions were present.

THOUGHTS: Could it be that the transmission temp gets too high? I have noticed lately that my coolant levels decrease dramatically but there is no oil in the tank, and the engine does not overheat. Just a thought.

I seriously dont know what to do. The guys at the service center said that the old oil had a lot of contaminants inside. Only 45k Miles on the car.. Unreal
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  #12  
Old 04-12-2017, 05:58 PM
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Quote:
Originally Posted by smassey321 View Post
Are you doing this yourself? If so you may want to change the solenoids/pressure regulators at the same time. I am now have having to drop my pan a 2nd time to do this on my 325. I wish I had just done it all the first.

Also, Send your code and symptoms to ZF and they will give you an opinion. Technical Inquiries - ZF Friedrichshafen AG
Is that an easy process? whats the cost associated with this work? I'm starting to think that this is a lost battle. I was considering changing my Oil cooler, since the Coolant fluid level's drop considerably and im trying to work out whether it's associated. 1/4 of a tank after 2 weeks.

Guys at the bmw said the didnt find coolant when they dropped the pan from my transmission though
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  #13  
Old 04-13-2017, 09:01 AM
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Quote:
Originally Posted by anth101 View Post
Is that an easy process? whats the cost associated with this work? I'm starting to think that this is a lost battle. I was considering changing my Oil cooler, since the Coolant fluid level's drop considerably and im trying to work out whether it's associated. 1/4 of a tank after 2 weeks.

Guys at the bmw said the didnt find coolant when they dropped the pan from my transmission though
I just finished changing my solenoids/pressure regulators last night. My daughters car now drives like new. The solenoids/pressure regulators were $300. Plus I needed a few extra quarts of fluid to replace what I could not save. Any decent transmission shop should be able to do this in a couple of hours. I had already replaced the fluid, pan and 5 seals a few months ago.

ZF 6HP19 6HP26 6HP32 Auto Transmission Solenoid kit ZF# 1068298044, 2004-UP | eBay

https://5series.net/forums/diy-do-yo...thread-137584/

Did you contact ZF from the link posted earlier? I told them what was going on and they told me what to do to fix it.

My issue was related to a harsh downshift when coming to a stop. This only happened when when the car was hot, having been driven for 30+ minutes, so the solenoids are definitely affected by heat.
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  #14  
Old 04-13-2017, 09:04 AM
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Also, There is a lot of data available from the transmission. Internal pressures are logged along with temperature. There is no reason to guess what is going on. Just use the data to rule out what is good and bad.
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  #15  
Old 04-13-2017, 11:39 AM
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hey smassey, thank you so much for your reply.

Thing is, I can't get access to the data since i do not own an ODB reading device. Is there any other way I can get the data? I would buy one , but it might be a bit hard to find the appropriate device in my location..

I will be pming genuine zf parts etc. asap. Thank you for your suggestion.

In your opinion, is it just the solenoids that are affected the most and need to be changed? BMW just quoted me 4k for a rebuilt transmission from ZF ...

Not sure how I feel about that. The trans is very smooth, although since the oil change I have noticed a longer "hang-on" time when the car goes through gears. Especially when "hot" (more than 50 mins of driving)

my problem in a few words is this: Casual driving, no issues whatsoever, but after 40-50 min of a very steady (highway) drive (approx 60mph, 5th or 6th engaged), then *boom, transmission malfunction out of the blue and I have to pull over. This never happens in short drives.
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  #16  
Old 04-13-2017, 12:30 PM
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Quote:
Originally Posted by anth101 View Post
hey smassey, thank you so much for your reply.

Thing is, I can't get access to the data since i do not own an ODB reading device. Is there any other way I can get the data? I would buy one , but it might be a bit hard to find the appropriate device in my location..

I will be pming genuine zf parts etc. asap. Thank you for your suggestion.

In your opinion, is it just the solenoids that are affected the most and need to be changed? BMW just quoted me 4k for a rebuilt transmission from ZF ...

Not sure how I feel about that. The trans is very smooth, although since the oil change I have noticed a longer "hang-on" time when the car goes through gears. Especially when "hot" (more than 50 mins of driving)

my problem in a few words is this: Casual driving, no issues whatsoever, but after 40-50 min of a very steady (highway) drive (approx 60mph, 5th or 6th engaged), then *boom, transmission malfunction out of the blue and I have to pull over. This never happens in short drives.
See what ZF says first. I recently purchased a 325i with a bad transmission and did a ton of research on what goes wrong with the ZF 6 speed. 80+% of the issues are related to the solenoids/pressure regulators. Needing a full rebuild is not required for most issues. The electronics generally shuts down the transmission before it can damage itself.
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  #17  
Old 04-13-2017, 01:38 PM
ard ard is offline
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1. BMW professionals DO NOT SERVICE TRANSMISSIONS. Dont be fooled- they have no idea how to fix a ZF transmission. They replace parts and assemblies- and based on their training the entire transmission is a replacement part.

2. You DO NOT WANT an "OBD Reader". You want a BMW reader- something that reads and interpretes proprietary BMW codes. Try Carly on the Appstore. Buy an adapter- done. 100 euros total

3. Try and find a shop that can rebuld a ZF transmission. NOT THAT YOU NEED A REBUILD, we dont know that yet. But such a shop will have the experience to troubleshoot your car. As has been stated above, there is plenty of diagnostic data for a qualified ZF tech to pinpoint your issue. Stop with BMW dealers.

IMO
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  #18  
Old 04-14-2017, 09:54 AM
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Quote:
Originally Posted by ard View Post
1. BMW professionals DO NOT SERVICE TRANSMISSIONS. Dont be fooled- they have no idea how to fix a ZF transmission. They replace parts and assemblies- and based on their training the entire transmission is a replacement part.

2. You DO NOT WANT an "OBD Reader". You want a BMW reader- something that reads and interpretes proprietary BMW codes. Try Carly on the Appstore. Buy an adapter- done. 100 euros total

3. Try and find a shop that can rebuld a ZF transmission. NOT THAT YOU NEED A REBUILD, we dont know that yet. But such a shop will have the experience to troubleshoot your car. As has been stated above, there is plenty of diagnostic data for a qualified ZF tech to pinpoint your issue. Stop with BMW dealers.

IMO

I hear you loud and clear. Thank you kindly Ard for the valuable advice.

I've already found couple of ZF specialist transmission shops, I'll drop by and see what they tell me. I've already ordered an INPA reading thingy in order to see what really is going on. Problem is shops will be closed until Tuesday the following days are bank holidays here.

I found this interesting: https://s3.amazonaws.com/sonnax-dev/...AutoChoice.pdf

Page 17 of 44.

" 3rd or 5th failsafe/ default mode.
 A TCM temperature out of range can create this. Check cooler and air flow"

Ive only seen ratio monitoring clutch E and C errors, and thats after a lot of driving. In my previous posts I was wondering if somethings wrong with the oil cooler, since my Coolant fluid level drops very fast (1 liter every month, maybe coolant leak near the oil cooler?), causing the tranny to overheat. When the BMW dealer dropped the pan to change seals and trans oil didnt mention coolant mixed into the old fluid though. Dunno

If I had an issue with the solenoids, shouldn't the failsafe pop up in low speeds and short drives as well?

Last edited by anth101; 04-14-2017 at 10:05 AM.
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  #19  
Old 04-18-2017, 12:50 PM
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UPDATE : 4-18-2017

After contacting ZG Genuine Parts (Klaus) I received the following message:

"I believe you have an internal issue, bushing wear would be my guess.
Most common on cylinder E and the intermediate plate. A worn bushing will cause E clutch pressure loss, the clutch starts slipping and trans goes to failsafe.
The link shows the bushings I am talking about:
ZF6HP26 & HP28 Bushing Kit from Omega Machine & Tool Inc.
The trans adaption is trying to compensate for the pressure loss but can only add a limited amount of pressure to the clutch.
Clearing the adaption values usually makes it worse."


By the way I would like to sincerely thank Klaus for his speedy response and invaluable advice in regards to my predicament. I appreciate it immensely.


Not sure what I do now, any advice? Should I go for a rebuilt? A remanufactured trans straight from ZF, or just sell the car and move on? Has any other member dealt with an issue similar to mine?
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  #20  
Old 04-18-2017, 01:20 PM
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Quote:
Originally Posted by anth101 View Post
UPDATE : 4-18-2017

After contacting ZG Genuine Parts (Klaus) I received the following message:

"I believe you have an internal issue, bushing wear would be my guess.
Most common on cylinder E and the intermediate plate. A worn bushing will cause E clutch pressure loss, the clutch starts slipping and trans goes to failsafe.
The link shows the bushings I am talking about:
ZF6HP26 & HP28 Bushing Kit from Omega Machine & Tool Inc.
The trans adaption is trying to compensate for the pressure loss but can only add a limited amount of pressure to the clutch.
Clearing the adaption values usually makes it worse."


By the way I would like to sincerely thank Klaus for his speedy response and invaluable advice in regards to my predicament. I appreciate it immensely.


Not sure what I do now, any advice? Should I go for a rebuilt? A remanufactured trans straight from ZF, or just sell the car and move on? Has any other member dealt with an issue similar to mine?
ZF told me the same thing about bushing wear. Bushing wear generally happens if drive around low on fluid which is tough to do because the transmission will quickly go into fail safe mode.

I then sent ZF my pressure readings and they changed their diagnoses to bad pressure regulators. This was from ISTA.
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Last edited by smassey321; 04-18-2017 at 01:26 PM.
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