DCT won't upshift but the gear indicator does change

Jackhammer909 · 05-18-2023, 01:39 PM

I've run into an issue 3 times in the last 10k miles in which I am in sport+ and in auto-mode when I do a pull up to around 6500-7k in 3rd and then let off. but since I don't like it to hang the revs up there in sport+, I'll then tap the paddle once or twice to upshift into a higher gear. the dash will show me now in manual 5th, but the revs haven't dropped. I can continue to shift up/down with the paddles all the way up to 7th and the indicator will change to match, but the revs stay where they're at. pop the shifter to the right to put it back in auto mode, the dash will show the change, but still the revs still hang.

It usually takes about 10-15 seconds for it to finally decide to upshift for real. no relevant error codes have been found in a scan.

I've tried to replicate the conditions to get to happen again with no luck. but then a couple months later, it randomly happens again.

any ideas? hard to have the dealer look it when it is so hard to replicate.

inTgr8r · 05-18-2023, 07:28 PM

Sounds strange...
Are you in or out of warranty & how many miles?

Jackhammer909 · 05-18-2023, 07:30 PM

2018. 60k miles. Out of factory warranty but do have excellent extended warranty.

Jackhammer909 · 05-18-2023, 07:32 PM

One interesting fact. All 3 times it has happened at the same freeway interchange ramop. Dont know what it is about that single spot

E90convert · 05-20-2023, 11:40 AM

If you do the same action, but in manual mode, does it hang still? If you do the same action, but leave it in auto and just let it ride until it upshifts on its own, what happens?

Jackhammer909 · 05-20-2023, 01:39 PM

Quote:

Originally Posted by E90convert

If you do the same action, but in manual mode, does it hang still? If you do the same action, but leave it in auto and just let it ride until it upshifts on its own, what happens?

since it happens so rarely, I haven't been able to purposely put it in the same condition to try it.

I don't normally take that offramp in manual mode.

I had previously thought about when it gets in that weird mode, would accelerating to force it to upshift work? perhaps, but I don't really want to have to go that fast. I've already maxed out my comfort for the pull in that area. don't really want to have to try to see if I can pull harder to get it to decide to shift into 4th or would it just bounce off the rev-limiter.

Enabled · 05-22-2023, 12:48 PM

Honestly I would pull codes first. You'll have faults or info stored in error memory and/or information memory even without lights.

Jackhammer909 · 05-22-2023, 12:58 PM

as previously mentioned, no codes were found

if there had been codes, then I'd have something for the dealer to look at. but since there are no codes, then its a wild-goose chase for them if we can't recreate it on demand.

DarthFader · 05-23-2023, 09:41 AM

I have DCT on my 135i and whenever it starts misbehaving I take it a local indy BMW shop and they reset all the DCT adaptations etc.
Takes them about 10 minutes and the car drives great for another 50k miles.

E90convert · 05-23-2023, 05:29 PM

I’ve noticed that sometimes when I’m in auto mode and there’s a traction control event it takes a while for a up shift to occur. I think the computer is waiting till there’s no wheel slip detected.

Enabled · 05-24-2023, 11:44 AM

Quote:

Originally Posted by Jackhammer909

as previously mentioned, no codes were found

if there had been codes, then I'd have something for the dealer to look at. but since there are no codes, then its a wild-goose chase for them if we can't recreate it on demand.

Just making sure, there are code readers and then there are BMW scanners that read a bit deeper.

That transmission and gear behavior is a bit concerning.

Ata_T1T · 05-24-2023, 12:14 PM

Happens to me aswell. It's something with the logic of the DCT shifting better when on throttle. So just upshift when ur on the throttle.

If you notice it also upshifts right away if u touch the throttle

Davil · 05-25-2023, 07:30 AM

Anyone that drives their DCT in anything other than manual mode other than in car parks or stop start traffic needs to be punished. The car is punishing you. So endeth the lesson.

E90convert · 05-29-2023, 09:00 AM

Quote:

Originally Posted by Davil

Anyone that drives their DCT in anything other than manual mode other than in car parks or stop start traffic needs to be punished. The car is punishing you. So endeth the lesson.

I daily drive mine in auto most of the time. During enthusiastic street driving and track use I switch to manual mode. Bring out the whips and chains!

akkando · 06-02-2023, 11:59 AM

While that is strange behavior, you should upshift while on throttle. Letting off throttle and then upshifting confuses the gearbox. Perhaps try switching it to comfort mode rather than upshift manually and let it pick a higher gear then go back to sport+ if you want? Honestly I never drive in auto mode so I'm not sure the normal behavior of auto sport+ and then manual shift while still in auto mode.

I agree with others though. Reset adaptions, change dct fluids if nothing is obvious.

05-18-2023, 01:39 PM	#1
Jackhammer909 Enlisted Member 35 Rep 49 Posts Drives: M2 Join Date: Jan 2022 Location: milky way iTrader: (3)	DCT won't upshift but the gear indicator does change I've run into an issue 3 times in the last 10k miles in which I am in sport+ and in auto-mode when I do a pull up to around 6500-7k in 3rd and then let off. but since I don't like it to hang the revs up there in sport+, I'll then tap the paddle once or twice to upshift into a higher gear. the dash will show me now in manual 5th, but the revs haven't dropped. I can continue to shift up/down with the paddles all the way up to 7th and the indicator will change to match, but the revs stay where they're at. pop the shifter to the right to put it back in auto mode, the dash will show the change, but still the revs still hang. It usually takes about 10-15 seconds for it to finally decide to upshift for real. no relevant error codes have been found in a scan. I've tried to replicate the conditions to get to happen again with no luck. but then a couple months later, it randomly happens again. any ideas? hard to have the dealer look it when it is so hard to replicate.
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05-18-2023, 07:28 PM	#2
inTgr8r Lieutenant General 2432 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	Sounds strange... Are you in or out of warranty & how many miles? __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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05-18-2023, 07:30 PM	#3
Jackhammer909 Enlisted Member 35 Rep 49 Posts Drives: M2 Join Date: Jan 2022 Location: milky way iTrader: (3)	2018. 60k miles. Out of factory warranty but do have excellent extended warranty.
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05-18-2023, 07:32 PM	#4
Jackhammer909 Enlisted Member 35 Rep 49 Posts Drives: M2 Join Date: Jan 2022 Location: milky way iTrader: (3)	One interesting fact. All 3 times it has happened at the same freeway interchange ramop. Dont know what it is about that single spot
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05-20-2023, 11:40 AM	#5
E90convert Lieutenant 162 Rep 422 Posts Drives: F87 M2 DCT, F15 X5 Join Date: Dec 2014 Location: Columbus, Ohio Metropolitan Area iTrader: (0)	If you do the same action, but in manual mode, does it hang still? If you do the same action, but leave it in auto and just let it ride until it upshifts on its own, what happens? __________________ ‘18 F87 M2 DCT '17 F15 X5 xDrive35i M-Sport Sold in 2023 '12 F30 335i 8AT Sport Line Sold in 2020 '08 E92 335xi 6MT Sold in 2016 '08 E90 335i 6MT - FBO
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05-22-2023, 12:48 PM	#7
Enabled Lieutenant Colonel 1410 Rep 1,803 Posts Drives: 328xd Wagon, M2 Competition Join Date: Jun 2018 Location: Houston iTrader: (0)	Honestly I would pull codes first. You'll have faults or info stored in error memory and/or information memory even without lights. __________________ -2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs. -2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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05-22-2023, 12:58 PM	#8
Jackhammer909 Enlisted Member 35 Rep 49 Posts Drives: M2 Join Date: Jan 2022 Location: milky way iTrader: (3)	as previously mentioned, no codes were found if there had been codes, then I'd have something for the dealer to look at. but since there are no codes, then its a wild-goose chase for them if we can't recreate it on demand.
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05-23-2023, 09:41 AM	#9
DarthFader Private First Class 134 Rep 177 Posts Drives: M2, 135i, F23 M240i Join Date: Aug 2016 Location: Wisconsin iTrader: (0)	I have DCT on my 135i and whenever it starts misbehaving I take it a local indy BMW shop and they reset all the DCT adaptations etc. Takes them about 10 minutes and the car drives great for another 50k miles.
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05-23-2023, 05:29 PM	#10
E90convert Lieutenant 162 Rep 422 Posts Drives: F87 M2 DCT, F15 X5 Join Date: Dec 2014 Location: Columbus, Ohio Metropolitan Area iTrader: (0)	I’ve noticed that sometimes when I’m in auto mode and there’s a traction control event it takes a while for a up shift to occur. I think the computer is waiting till there’s no wheel slip detected. __________________ ‘18 F87 M2 DCT '17 F15 X5 xDrive35i M-Sport Sold in 2023 '12 F30 335i 8AT Sport Line Sold in 2020 '08 E92 335xi 6MT Sold in 2016 '08 E90 335i 6MT - FBO
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05-24-2023, 12:14 PM	#12
Ata_T1T New Member 12 Rep 26 Posts Drives: 2017 M2 Join Date: Jul 2022 Location: Vancouver, BC iTrader: (0)	Happens to me aswell. It's something with the logic of the DCT shifting better when on throttle. So just upshift when ur on the throttle. If you notice it also upshifts right away if u touch the throttle
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05-25-2023, 07:30 AM	#13
Davil Brigadier General 6525 Rep 3,072 Posts Drives: M2 CS, 18 Vantage AMR, 00 WRX Join Date: Jul 2018 Location: Australia iTrader: (0) Garage List 2018 Aston Martin V ... [8.33] 2021 BMW M2 CS F87 [9.87] 2000 Subaru WRX GC8 [7.75]	Anyone that drives their DCT in anything other than manual mode other than in car parks or stop start traffic needs to be punished. The car is punishing you. So endeth the lesson.
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06-02-2023, 11:59 AM	#15
akkando Major General 5865 Rep 6,635 Posts Drives: 17 M2 DCT LBB,11 e90 M3 ZCP IB Join Date: Jan 2017 Location: Bay Area iTrader: (1)	While that is strange behavior, you should upshift while on throttle. Letting off throttle and then upshifting confuses the gearbox. Perhaps try switching it to comfort mode rather than upshift manually and let it pick a higher gear then go back to sport+ if you want? Honestly I never drive in auto mode so I'm not sure the normal behavior of auto sport+ and then manual shift while still in auto mode. I agree with others though. Reset adaptions, change dct fluids if nothing is obvious.
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