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      12-17-2019, 01:28 PM   #1
BungieHD
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F30 Auto transmission problems persist!

I'm still having problems with my car if anyone is interested? The torque converter and transmission have been replaced under warranty and the fault persists! The car (340i touring m-sport) judders/shudders on 1st-2nd up change anyone else had this? BMW are still investigating.........
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      12-17-2019, 01:29 PM   #2
BungieHD
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test reply?????

Reply ??????
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      12-17-2019, 01:56 PM   #3
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Are you based in UK? Is there a lemon law that you could research and at least prepare for the possible buy back request?
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      12-17-2019, 02:32 PM   #4
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Quote:
Originally Posted by BungieHD View Post
I'm still having problems with my car if anyone is interested? The torque converter and transmission have been replaced under warranty and the fault persists! The car (340i touring m-sport) judders/shudders on 1st-2nd up change anyone else had this? BMW are still investigating.........
What's the back story to why the garage decided to fit a new gearbox and TC?
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      12-18-2019, 10:41 AM   #5
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My 2014 335i had the transmission replaced under warranty. Maybe same issue...delay in gear engagement from 1st to 2nd and 2nd to 3rd. Much back and forth with BMWNA and dealer, threatened with NC state lemon law...was ultimately resolved to my satisfaction.
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      12-18-2019, 03:28 PM   #6
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What was the final diagnosis?


Quote:
Originally Posted by otay View Post
My 2014 335i had the transmission replaced under warranty. Maybe same issue...delay in gear engagement from 1st to 2nd and 2nd to 3rd. Much back and forth with BMWNA and dealer, threatened with NC state lemon law...was ultimately resolved to my satisfaction.
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      12-18-2019, 04:23 PM   #7
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What was the final diagnosis?
The dealer couldn't figure it out. After initially denying any issue, I went back and had a senior tech ride with me and he agreed it wasn't right. First they changed the fluid. Still had slow shifts. They then sent a fluid sample to BMW, and subsequently replaced the mechatronic (valve body). Problem persisted, so they eventually replaced the complete transmission. Total of 21 days out of service over a couple of months....which happens to be the limit for lemon law in North Carolina. Wasn't fun.
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      12-18-2019, 06:26 PM   #8
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Did the symptoms occur on cold starts or did it persist through when it reaches operating temp
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      12-19-2019, 06:13 AM   #9
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Quote:
Originally Posted by arvi604 View Post
Did the symptoms occur on cold starts or did it persist through when it reaches operating temp
Happened all the time...not dependent on temp.
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      12-19-2019, 06:22 PM   #10
floydarogers
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My nephew had transmission faults on his F80 with DCT. He eventually took their advice and replaced the transmission OUT OF WARRANTY - $20K. Still had faults. And the dealer closed his hood, caused a BIG dimple, on some tool and refused to take responsibility. He has sold the car, and trashed the dealership (Bellevue BMW) on the WWW. He also sold his cherry E46 M3 because he's done with BMWs.
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      12-19-2019, 09:52 PM   #11
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Is this in sport or comfort?

Mine (335i, same trans AFAIK) jolts in 1st to 2nd in sport. 2nd to 3rd can behave very oddly if throttle input is low.

In comfort, smooth in all gears.
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      12-20-2019, 03:42 AM   #12
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do you have mppk?

in my 435xi when stock, the transmission was not smooth as it is with the mppk.

just fyi.
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      12-26-2019, 12:39 PM   #13
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Thanks everyone for the comments. Dick Lovett have changed the
Torque converter, and the transmission under warranty. Software and driving style were reset etc. The problem is simply shudder/judder as the 1/2 upshift takes place. Seems more noticable when the car is hot. BMW were gonna look for another 340i to test/compare. All very dissapointing with a new car:-(
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      12-30-2019, 12:16 AM   #14
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Mine 2014 335i jerks at 1st and 2nd gears as well. Right after I changed the spark plugs, it's much smoother but in a week or two it's coming back again.

You can tray a transmission program reset to see if it helps.
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      12-30-2019, 02:08 AM   #15
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#SaveTheManuals
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      12-30-2019, 10:58 AM   #16
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Mine sometimes shifts with a jerk from 1st to 2nd when shifting manually but is fine in auto. This is at low speed if I shift at higher rpm it's fine.
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      07-09-2021, 07:42 AM   #17
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Quote:
Originally Posted by BungieHD View Post
I'm still having problems with my car if anyone is interested? The torque converter and transmission have been replaced under warranty and the fault persists! The car (340i touring m-sport) judders/shudders on 1st-2nd up change anyone else had this? BMW are still investigating.........
Wes solved it on mine- a 45 series (yours is a 50). FAULTY RECALLED ZF FACTORY SOLLENOIDS. The recall was not just clear, but color coded clear (look for red, insert blue).

Basically, once we did that two days ago, the near dying, jittery hesitating transmission started to heal. By healing I mean new solenoid amperage and pressure flow kicked off again.

As solenoids FAIL (in my case, design flaw that ZF admitted by BMW NEVER BOTHERED TO RECALL), the control module compensates by:

A- increasing pressure map (to force gear engagement) and
B- increase latency (to ensure the engagement takes place), that milisecond timing goes up and up and up...

2-3 is when you would feel it the most for obvious gear physics reasons...

Presently, the control module is readapting, as an adaption reset was not recommended by ZF, requesting that we let the CM drop the pressures with driving (12-20 full trans heat cycles).


So a month ago i could barely leave a light stop shaking 2-4, now it is gone. Even is minor damage creeped in, it is still a functioning trans at 115,000 kms..

Liquid checked, clear after 1000 kms..
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      07-09-2021, 08:02 AM   #18
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Quote:
Originally Posted by BungieHD View Post
Thanks everyone for the comments. Dick Lovett have changed the
Torque converter, and the transmission under warranty. Software and driving style were reset etc. The problem is simply shudder/judder as the 1/2 upshift takes place. Seems more noticable when the car is hot. BMW were gonna look for another 340i to test/compare. All very dissapointing with a new car:-(
See my reply- Yes we thought my torque converter, piston were done. 18,000$ CAD BMW estimate invoice. The issue turned out faulty solenoids that ZF RECALLED.

Heat = drop in pressure. This can be caused by two things- Leak (easy to check) or faulty solenoids (more expensive and less easy to check).

At temp, the old or used oil, lesser volume, is facing solenoids and a control module deciding how to pump it. Any issue- volume drop or failing, amperage submerge heart issue (solenoids) have the control module deciding to up the pressure and increase the engagement latency.

Long story short, after an oil change, friction additive, solenoid swap fixed it. Torque converter engages and stays engaged. The module is still readapting, learning to gradually lower the pressure (with working, properly pumping solenoids) and reducing the latency, over multiple drives. The module basically determines.

Why the issues? the faulty solenoids affected most 45 and some 50s. Apparently ZF issued a recall that BMW (presumably Audi as well) never bothered to relay nor concerned itself. when I visited the BMW SC, they determined a trans issue but they NEVER CHECKED the 45 troubleshooting steps (check solenoids), and just quoted me 18,000$ CAD instead...They never repair, just swap.

In the EU, esp germany, it appears to be different.
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