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Harsh Shifting issue resolved itself! Future problem?

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Old Apr 25, 2021 | 11:19 AM
  #1  
brianc63s's Avatar
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From: Toronto
c63s coupe, bmw 335i coupe (winterbeater)
Harsh Shifting issue resolved itself! Future problem?

Hey guys,
I wanna share an issue I experienced yesterday for the first time since owning the car which has been 6 months.
I’m absolutely in love with my 2017 c63s coupe! It is an absolute blast to drive and has been flawless since day 1, it is not my daily as I have a 335i n54 for work. So yesterday I took it out and went for a little drive, I let it warm up until the dynamic car data showed the engine and trans in the grey zone and so I proceeded to switch mode from comfort to S+ and then Race, and just went into shock when I felt the car engaging gears with a huge delay and very, and I mean VERY jerky shifts, almost hurt my neck from how bad it was. Happened from 1-2 and 2-3, 3-4 wasn’t as bad but still very jerky and not like the smooth almost seamless shifts I was used to prior to this event. I instantly went into depression thinking my tranny is garbage. So I shut it off, called the dealer and tried to set up an appointment, they told me that they would half to charge a 3 hour diagnostic fee so $585 just to find the problem, they also told me to shut it off park it, and turn it on again to see if the system restarting itself would solve the issue, and guess what, it DID! Car is back to normal and driving like a dream again. Does anyone know what might have happened? And if I should be concerned in the future?
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Old Apr 26, 2021 | 09:07 AM
  #2  
mstraka's Avatar
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From: New Orleans. LA
amg C63s
Were you in auto or manual mode when doing the upshifting?
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Old Apr 26, 2021 | 09:20 AM
  #3  
brianc63s's Avatar
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From: Toronto
c63s coupe, bmw 335i coupe (winterbeater)
Originally Posted by mstraka
Were you in auto or manual mode when doing the upshifting?
I tried in both modes and it happened regardless..
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Old May 1, 2021 | 11:19 AM
  #4  
Den A's Avatar
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c63s coupe
Hey I had same issue. It happens when in comfort mode that darn start stop activates
and shuts the car down. When it abruptly starts again, it completely ruins the shifting no matter which gear. For me I just let it stop again on a red light and on the next start fixes itself immediately. It seems to be connected to a faulty start stop system. I solved
This Issue by buying an obd
adapter module to turn that start stop garbage off permanently. It’s been 7 months and never happened again. Check this YouTube video. I bought the module from tornado tuning.

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Old May 1, 2021 | 03:10 PM
  #5  
brianc63s's Avatar
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Joined: Sep 2020
Posts: 172
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From: Toronto
c63s coupe, bmw 335i coupe (winterbeater)
Originally Posted by Den A
Hey I had same issue. It happens when in comfort mode that darn start stop activates
and shuts the car down. When it abruptly starts again, it completely ruins the shifting no matter which gear. For me I just let it stop again on a red light and on the next start fixes itself immediately. It seems to be connected to a faulty start stop system. I solved
This Issue by buying an obd
adapter module to turn that start stop garbage off permanently. It’s been 7 months and never happened again. Check this YouTube video. I bought the module from tornado tuning.

https://youtu.be/F6A3t3C7vUs
cool stuff. So basically if I just get in the car and shut off the auto shut off feature right away they the car should be good! Thanks for the advice!
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Old Jun 15, 2023 | 01:31 PM
  #6  
J31 YRE's Avatar
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Joined: Jun 2023
Posts: 1
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c63s w205 2017 coupe
Same issue

Originally Posted by brianc63s
Hey guys,
I wanna share an issue I experienced yesterday for the first time since owning the car which has been 6 months.
I’m absolutely in love with my 2017 c63s coupe! It is an absolute blast to drive and has been flawless since day 1, it is not my daily as I have a 335i n54 for work. So yesterday I took it out and went for a little drive, I let it warm up until the dynamic car data showed the engine and trans in the grey zone and so I proceeded to switch mode from comfort to S+ and then Race, and just went into shock when I felt the car engaging gears with a huge delay and very, and I mean VERY jerky shifts, almost hurt my neck from how bad it was. Happened from 1-2 and 2-3, 3-4 wasn’t as bad but still very jerky and not like the smooth almost seamless shifts I was used to prior to this event. I instantly went into depression thinking my tranny is garbage. So I shut it off, called the dealer and tried to set up an appointment, they told me that they would half to charge a 3 hour diagnostic fee so $585 just to find the problem, they also told me to shut it off park it, and turn it on again to see if the system restarting itself would solve the issue, and guess what, it DID! Car is back to normal and driving like a dream again. Does anyone know what might have happened? And if I should be concerned in the future?
I’m currently having the exact same issue mate.
mb currently have the car and cause it happens intermittently it hasn’t done it when they checked it.

it only happens every other drive and when I turn the car off and on again it clears.

any update on your mate?
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Old Jun 21, 2023 | 10:13 AM
  #7  
ahad5058's Avatar
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Joined: Jun 2020
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Audi S6 C7
I had this issue back when I fiurst got the car and I have had it again maybe 3 times every 6mo. Just keep doing your trans adaptations and it will quickly fix them. I did realize that more driving in the sport modes tends to not bring them back. I hadvent had it in the last 4 months now.
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