DCT replaced after 20,000 KMs !!!

sforce · 08-28-2020, 08:31 PM

2016 M4 DCT with only 20,000 KMs

Needed new transmission. Service Notes below. Anyone else have this?

ROAD TESTED AND VERIFIED GRINDING NOISE BETWEEN SHIFTS(DCT
GEARBOX). GRINDING NOISE IS PRESENT AT ALL SHIFT SPEEDS(1-3)
IN MANUAL AND AUTO MODES. RAN BRIEF TEST, NO RELATED FAULTS
STORED. FOLLOWED THROUGH TEST PLAN FOR SHIFT FORKS, NO
ISSUES FOUND WHEN PERFORMING CHECK. ATTEMPTED TO RUN THROUGH
TRANSMISSION SENSOR CHECKS AND CLUTCH CHECKS HOWEVER ALL
TEST PLANS END AS NO FAULTS ARE STORED. GRINDING NOISE IS
INTERNAL TO TRANSMISSION AND ONLY OCCURS BETWEEN SHIFTS.
NOISE IS CHARACTERISTIC TO GRINDING OF GEARS WHERE IT IS
POSSIBLE ONE OR MORE SYNCHRONIZERS ARE DAMAGED OR SHIFTING
FORKS ARE DAMAGED. FAULT IS INTERNAL TO TRANSMISSION, DCT
GEARBOX REQUIRES REPLACEMENT.
REPLACED THE TWIN CLUTCH GEARBOX ASSEMBLY.

deeldoo · 08-28-2020, 08:32 PM

Quote:

Originally Posted by sforce

2016 M4 DCT with only 20,000 KMs

Needed new transmission. Service Notes below. Anyone else have this?

ROAD TESTED AND VERIFIED GRINDING NOISE BETWEEN SHIFTS(DCT
GEARBOX). GRINDING NOISE IS PRESENT AT ALL SHIFT SPEEDS(1-3)
IN MANUAL AND AUTO MODES. RAN BRIEF TEST, NO RELATED FAULTS
STORED. FOLLOWED THROUGH TEST PLAN FOR SHIFT FORKS, NO
ISSUES FOUND WHEN PERFORMING CHECK. ATTEMPTED TO RUN THROUGH
TRANSMISSION SENSOR CHECKS AND CLUTCH CHECKS HOWEVER ALL
TEST PLANS END AS NO FAULTS ARE STORED. GRINDING NOISE IS
INTERNAL TO TRANSMISSION AND ONLY OCCURS BETWEEN SHIFTS.
NOISE IS CHARACTERISTIC TO GRINDING OF GEARS WHERE IT IS
POSSIBLE ONE OR MORE SYNCHRONIZERS ARE DAMAGED OR SHIFTING
FORKS ARE DAMAGED. FAULT IS INTERNAL TO TRANSMISSION, DCT
GEARBOX REQUIRES REPLACEMENT.
REPLACED THE TWIN CLUTCH GEARBOX ASSEMBLY.

That is really fucked up.

Did you have a transmission shudder accelerating in gear?

chewbakam4 · 08-28-2020, 08:55 PM

Probably fried your clutches. Look into SSP clutch upgrade

White340 · 08-28-2020, 11:15 PM

Under warranty?

maddmatth · 08-30-2020, 03:00 AM

Try request a goodwill repair if it's no longer under warranty?

That sucks, BMW DCT failures are very rare I believe. But if it happens.... The costs are not pleasant.

Bmwlmr99 · 08-30-2020, 03:37 PM

drifting or burnouts for your friends???

JayhawkM4 · 01-19-2021, 11:34 PM

DCT started acting up on my M4 3 weeks ago. Started slipping back into park from both D and R when in driveway. Took it into service and was told something shorted out in in shifter assembly and replaced for $1,800. Picked up and same thing, then other issues began. Wouldn't go into 1st gear at a full stop, wouldn't shift at normal shift points. Took it back from service and on the way got a drivetrain malfunction message. Service had it for a week, passed to "foreman' and called today and are asking BMW for an "assessment." Was told best case replace the mechatronic adapter, $5,000 or replace the transmission $10K plus for the transmission, no labor. ONLY 50K miles. No warranty. Thinking about buying a used DCT for $3K. Any advice?

charpy · 01-23-2021, 07:09 PM

Quote:

Originally Posted by sforce

2016 M4 DCT with only 20,000 KMs

Needed new transmission. Service Notes below. Anyone else have this?

ROAD TESTED AND VERIFIED GRINDING NOISE BETWEEN SHIFTS(DCT
GEARBOX). GRINDING NOISE IS PRESENT AT ALL SHIFT SPEEDS(1-3)
IN MANUAL AND AUTO MODES. RAN BRIEF TEST, NO RELATED FAULTS
STORED. FOLLOWED THROUGH TEST PLAN FOR SHIFT FORKS, NO
ISSUES FOUND WHEN PERFORMING CHECK. ATTEMPTED TO RUN THROUGH
TRANSMISSION SENSOR CHECKS AND CLUTCH CHECKS HOWEVER ALL
TEST PLANS END AS NO FAULTS ARE STORED. GRINDING NOISE IS
INTERNAL TO TRANSMISSION AND ONLY OCCURS BETWEEN SHIFTS.
NOISE IS CHARACTERISTIC TO GRINDING OF GEARS WHERE IT IS
POSSIBLE ONE OR MORE SYNCHRONIZERS ARE DAMAGED OR SHIFTING
FORKS ARE DAMAGED. FAULT IS INTERNAL TO TRANSMISSION, DCT
GEARBOX REQUIRES REPLACEMENT.
REPLACED THE TWIN CLUTCH GEARBOX ASSEMBLY.

I had the exact same issue with my 2016 M4 DCT last July at 27k miles. The grinding was most noticeable from 3rd through 5th gear. I did not receive any errors but could hear and feel it when shifting. I'm the second owner, and drive spirited when able, but just cruise much of the time, no track time. This started out of the blue one day, brought it to my local BMW dealer and they noted pretty much the same thing, stating the Synchros were the issue. They sent logs to Germany and they stated there shouldn't have been an issue. They replaced the entire transmission to the tune of $19,8XX, thankfully still under warranty. Thus far all is well with only about 5k miles on the new transmission, I can definitely feel a difference though, it drives much better now!

maddmatth · 01-24-2021, 07:47 PM

Quote:

Originally Posted by JayhawkM4

No warranty. Thinking about buying a used DCT for $3K. Any advice?

Damn. Yeah definitely buy used. At that price you can afford to go through a few used transmissions before you've spent as much as a new one.
Faults with these DCTs are very rare, so risk is very low with a used unit.

kyrix1st · 01-24-2021, 08:14 PM

If you drive like a granny you will wear out the clutches quickly.

DCT is a sequential manual gearbox, not your typical slush auto.

mfurse · 01-25-2021, 07:23 PM

Sounds like a similar fault I had and BMW did a full DCT replacement under warranty.

The fault was a faint and repeatable "clunk" when going from 2 to 3 or when in 3 and changing to neutral when moving under light loads. This was pronounced, repeatable and not the same clunk noise you get when going into R at a stand still or when going through the gears.

Premature Synchro wear was the diagnosis and they don't break open the DCT boxes to fix them - they send them back to Germany and swapped for a new one. Mine was around 15,000 KMs.

08-28-2020, 08:31 PM	#1
sforce Sakhir Orange 0 Rep 5 Posts Drives: 2016 M4 Join Date: Aug 2018 Location: Toronto, Ontario iTrader: (0)	DCT replaced after 20,000 KMs !!! 2016 M4 DCT with only 20,000 KMs Needed new transmission. Service Notes below. Anyone else have this? ROAD TESTED AND VERIFIED GRINDING NOISE BETWEEN SHIFTS(DCT GEARBOX). GRINDING NOISE IS PRESENT AT ALL SHIFT SPEEDS(1-3) IN MANUAL AND AUTO MODES. RAN BRIEF TEST, NO RELATED FAULTS STORED. FOLLOWED THROUGH TEST PLAN FOR SHIFT FORKS, NO ISSUES FOUND WHEN PERFORMING CHECK. ATTEMPTED TO RUN THROUGH TRANSMISSION SENSOR CHECKS AND CLUTCH CHECKS HOWEVER ALL TEST PLANS END AS NO FAULTS ARE STORED. GRINDING NOISE IS INTERNAL TO TRANSMISSION AND ONLY OCCURS BETWEEN SHIFTS. NOISE IS CHARACTERISTIC TO GRINDING OF GEARS WHERE IT IS POSSIBLE ONE OR MORE SYNCHRONIZERS ARE DAMAGED OR SHIFTING FORKS ARE DAMAGED. FAULT IS INTERNAL TO TRANSMISSION, DCT GEARBOX REQUIRES REPLACEMENT. REPLACED THE TWIN CLUTCH GEARBOX ASSEMBLY.
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08-28-2020, 08:55 PM	#3
chewbakam4 Major 717 Rep 1,184 Posts Drives: F82 M4 Join Date: Oct 2015 Location: Malton iTrader: (0)	Probably fried your clutches. Look into SSP clutch upgrade
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08-28-2020, 11:15 PM	#4
White340 Lieutenant Colonel 1393 Rep 1,986 Posts Drives: 2018 M3 Comp / 2022 X5 45e Join Date: Dec 2015 Location: NYC iTrader: (3)	Under warranty? __________________ 2022 X5 45e : AW/Tartufo 2018 M3 Competition : AW/SO 2016 340i xDrive : AW/CR (sold)
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08-30-2020, 03:00 AM	#5
maddmatth Major 555 Rep 922 Posts Drives: F82 M4, E92 335i Join Date: Jun 2015 Location: New Zealand iTrader: (0)	Try request a goodwill repair if it's no longer under warranty? That sucks, BMW DCT failures are very rare I believe. But if it happens.... The costs are not pleasant.
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08-30-2020, 03:37 PM	#6
Bmwlmr99 First Lieutenant 209 Rep 314 Posts Drives: Bmw m4 Join Date: Jul 2016 Location: Texas iTrader: (0)	drifting or burnouts for your friends???
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01-19-2021, 11:34 PM	#7
JayhawkM4 Registered 0 Rep 2 Posts Drives: BMW M4 Join Date: Jan 2021 Location: St. Louis, MO iTrader: (0)	DCT started acting up on my M4 3 weeks ago. Started slipping back into park from both D and R when in driveway. Took it into service and was told something shorted out in in shifter assembly and replaced for $1,800. Picked up and same thing, then other issues began. Wouldn't go into 1st gear at a full stop, wouldn't shift at normal shift points. Took it back from service and on the way got a drivetrain malfunction message. Service had it for a week, passed to "foreman' and called today and are asking BMW for an "assessment." Was told best case replace the mechatronic adapter, $5,000 or replace the transmission $10K plus for the transmission, no labor. ONLY 50K miles. No warranty. Thinking about buying a used DCT for $3K. Any advice?
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01-24-2021, 08:14 PM	#10
kyrix1st Colonel 2362 Rep 2,362 Posts Drives: G87 M2; E92M3 MT&DCT; M3 euro Join Date: Sep 2014 Location: nyc iTrader: (0) Garage List 2004 BMW Z4 [0.00]	If you drive like a granny you will wear out the clutches quickly. DCT is a sequential manual gearbox, not your typical slush auto. __________________ Pass me if you can.
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01-25-2021, 07:23 PM	#11
mfurse First Lieutenant 182 Rep 357 Posts Drives: BMW F80 M3 2016 LCI Join Date: Sep 2015 Location: Melbourne, VIC iTrader: (0)	Sounds like a similar fault I had and BMW did a full DCT replacement under warranty. The fault was a faint and repeatable "clunk" when going from 2 to 3 or when in 3 and changing to neutral when moving under light loads. This was pronounced, repeatable and not the same clunk noise you get when going into R at a stand still or when going through the gears. Premature Synchro wear was the diagnosis and they don't break open the DCT boxes to fix them - they send them back to Germany and swapped for a new one. Mine was around 15,000 KMs.
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