[Wolf 335]

Fellas,

2007 335i E92 RWD with ZF Automatic Transmission GA6HP19Z

I have replaced transmission pan, oil, 4 sleeves, square adapter in September 2018.

Issue:
- For the past month, whenever i try to accelerate i hear a hollow whirling sound which is immediately followed by a jerk and partial loss off power.
- I have to let go of the gas, let the rpms drop, and then accelerate again.
- Seems to be happening in 4th to 5th gear, only when it goes over 2000 rpms on heavier acceleration. If driving lighting/moderately no issues are presented.

I'm searching but i am not seeing this characteristic described anywhere.

Car was scanned at the shop with following codes:
(Printer was no good as you can see streaks all over)




0029F3 DME: Fuel low-pressure sensor, electric
002A12 DME: DMTL solenoid valve, activation
002A13 DME: DMTL leak diagnosis pump, activation
002A18 DME: DMTL heater, activation
004F82 EGS: Ratio monitoring, clutch B
005DBC DSC: Hydraulic unit: pressure sensor, plausibility
005DCC DSC: Hydraulic unit: Pressure sensor, plausibility
00A6CF JBE: AUC sensor


Potential causes I would suspect:
Solenoids, brass bushings, clutch plates

I would appreciate some of your knowledgeable feedback. Thanks.

[nyt]

What gear is this in?

[Jeff@TopGearSolutions]

Codes?

[bizzleb109]

Hi I experienced something similar on my 2007 335i when i would accelerate I would sometimes get a jerk and a hollow whistle type sound. Ended up carrying out a transmission service had the oil changed and all has been good over a year now. Hope this helps

[iqraceworks]

Use xHP to scan for transmission codes. Then shoot an email to ZF tech service and ask them what the codes mean, and tell them what it's doing. ZF is great about getting back to you..they can point you in the right direction.

[nicky dj]

Did you change the transmission solenoids when you dropped the transmission pan? A lot of threads with great success doing that

[Wolf 335]

Originally Posted by nyt

What gear is this in?

4th to 5th gear

Originally Posted by Jeff@TopGearSolutions

Codes?

Jeff see the codes i attached in original post

[Wolf 335]

Originally Posted by nicky dj

Did you change the transmission solenoids when you dropped the transmission pan? A lot of threads with great success doing that

I did not change the solenoids at that time.

[Wolf 335]

Original post updated with codes

[relative4]

Check the fluid level.

[Wolf 335]

Originally Posted by relative4

Check the fluid level.

Checked fluid after pulling codes, was ok.

[iqraceworks]

One of the codes mentions solenoid function. The next thing I would do is pull out the valve body, and change all of the solenoids. My transmission is acting up.....and I'm getting ready to do the same thing. You can buy the new OEM ZF solenoids for around $200-ish for the whole set on eBay.

That's the cheapest thing you can try.....after that you are talking a new valve body and/or rebuild.....around $2,000+.

Also, have you tried emailing ZF tech service with the info and codes? They are good about replying with info for you.

[relative4]

Originally Posted by iqraceworks

One of the codes mentions solenoid function. The next thing I would do is pull out the valve body, and change all of the solenoids.

Are you referring to.the 2A12? That has nothing to do with the transmission.
Not saying replacing the solenoids won't help. Just clarifying that is a complete misread of the code, and nothing in the codes points directly to the transmission solenoids.

[Wolf 335]

iqraceworks, as relative4 mentioned, that solenoid code is for something else. It doesn't pertain to transmission.

I have just emailed ZF, we will see what they have to say.

[iqraceworks]

Originally Posted by Wolf 335

iqraceworks, as relative4 mentioned, that solenoid code is for something else. It doesn't pertain to transmission.

I have just emailed ZF, we will see what they have to say.

Ok, sounds good. Either way....the next logical (and least costly step) would be to replace all of the shift solenoids. After that....you don't really have any cheap options left.....except maybe trying to throw a used low milage 6HP21 in there.

On a side note....when you checked the fluid level, was the transmission at the proper temp? 40c I believe is what they say is the correct temp to check it at, but I would double check that.

Also....what ATF fluid are you running in it? ZF Lifetime fluid, or something else?

[Wolf 335]

Originally Posted by iqraceworks

Ok, sounds good. Either way....the next logical (and least costly step) would be to replace all of the shift solenoids. After that....you don't really have any cheap options left.....except maybe trying to throw a used low milage 6HP21 in there.

On a side note....when you checked the fluid level, was the transmission at the proper temp? 40c I believe is what they say is the correct temp to check it at, but I would double check that.

Also....what ATF fluid are you running in it? ZF Lifetime fluid, or something else?

Running ZF original fluid for this transmission. Temp was in range during the check.

[ewicky]

subscribed. I sometimes have this exact issue. Just replaced solenoids and didn't fix it (already done a couple fluid changes with pan/filter, mechatronics sleeve and 4 seals). Shifts fine in manual mode, and in auto mode with very light or heavy throttle. It's only when it tries to do a "soft" shift that it can't grab 5th gear and the RPMs flair up.

[nyt]

Originally Posted by Wolf 335

4th to 5th gear



Jeff see the codes i attached in original post

Your E clutches are probably toast. Good chance the bushings are worn as well.

[nyt]

Originally Posted by ewicky

subscribed. I sometimes have this exact issue. Just replaced solenoids and didn't fix it (already done a couple fluid changes with pan/filter, mechatronics sleeve and 4 seals). Shifts fine in manual mode, and in auto mode with very light or heavy throttle. It's only when it tries to do a "soft" shift that it can't grab 5th gear and the RPMs flair up.

4th gear has the A and E clutches applied. Going to 5th releases the A clutch, leaving only the E clutches. This indicates either worn E clutches or inadequate pressure to the E clutch or both.

[ewicky]

Originally Posted by nyt

4th gear has the A and E clutches applied. Going to 5th releases the A clutch, leaving only the E clutches. This indicates either worn E clutches or inadequate pressure to the E clutch or both.

Thanks, yes thru my research I've seen E clutch as the #1 suspect for 5th gear issues. It is also apparently the smallest clutch. I find it odd thou how when it detects it is missing 5th, it will usually slam it back into 4th, no problem. And once in 5th, it can hold the gear as well. I would think if the E friction material was all gone, it would fail differently, and I would have seen something in the oil analyses I sent in.

Besides replacing the tranny, I suppose I have 2 remaining possible fixes: rebuild the valve body in case it's a ball valve, or dig into the gear train. Ugh.

[nyt]

Originally Posted by ewicky

Thanks, yes thru my research I've seen E clutch as the #1 suspect for 5th gear issues. It is also apparently the smallest clutch. I find it odd thou how when it detects it is missing 5th, it will usually slam it back into 4th, no problem. And once in 5th, it can hold the gear as well. I would think if the E friction material was all gone, it would fail differently, and I would have seen something in the oil analyses I sent in.

Besides replacing the tranny, I suppose I have 2 remaining possible fixes: rebuild the valve body in case it's a ball valve, or dig into the gear train. Ugh.

Why would you replace the trans? They're not difficult to service.

Get some PD clutches and bushings at a minimum.

I'll be posting up a guide soon enough, but there are plenty of vids on youtube on tearing down 6hps. Messy, but not very difficult if intact.

[Wolf 335]

Originally Posted by nyt

4th gear has the A and E clutches applied. Going to 5th releases the A clutch, leaving only the E clutches. This indicates either worn E clutches or inadequate pressure to the E clutch or both.

My code is referencing Clutch B. Can your theory still be applied?

If it is pressure related I’m assuming then it’s solenoids, correct?