Transmission re-programming? Not reset!
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2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
Transmission re-programming? Not reset!
My transmission is super annoying and it's not the rough shifting issue described in other posts. Shifting is smooth, but under normal acceleration in 1st gear it revs up to ~3500 rpm before shifting into 2nd then milliseconds later into 3rd. From the 3rd up everything is normal.
Below is an attempt at a visual representation of the gear-acceleration of what it should be (1st line) vs. what it actually is (2nd line):
-----1-----/-----2-----/-----3-----/-----4-----/-----5-----...
----------1--------/-2-/-----3-----/-----4-----/-----5-----...
I've read in one of the posts that it is possible to have the transmission re-programmed but it takes 2 service techs + a laptop + a long drive.
Does anyone have any information on how to request this without the dealer saying "there's no such thing" or denying that such procedure can be performed at all? I need some proof that it can be done/has been performed before.
Also, I'm pretty sure if I ask whether there's a software update for my transmission the dealer will say "sorry, no".
I've had it reset (not re-programmed) by the dealer but the shifting pattern didn't change.
This is a 2017 C300 with the 7G transmission.
As a side note: every time I move off at a green light the high rpm sounds like I'm trying to race the car next to me while I'm not. It is super annoying.
I've found that if I lift off the acceleration before I reach 2500 rpm in first gear then it shifts into 2nd and things get normal from there on. However, that's not a viable solution as it sort of jerks the car.
Below is an attempt at a visual representation of the gear-acceleration of what it should be (1st line) vs. what it actually is (2nd line):
-----1-----/-----2-----/-----3-----/-----4-----/-----5-----...
----------1--------/-2-/-----3-----/-----4-----/-----5-----...
I've read in one of the posts that it is possible to have the transmission re-programmed but it takes 2 service techs + a laptop + a long drive.
Does anyone have any information on how to request this without the dealer saying "there's no such thing" or denying that such procedure can be performed at all? I need some proof that it can be done/has been performed before.
Also, I'm pretty sure if I ask whether there's a software update for my transmission the dealer will say "sorry, no".
I've had it reset (not re-programmed) by the dealer but the shifting pattern didn't change.
This is a 2017 C300 with the 7G transmission.
As a side note: every time I move off at a green light the high rpm sounds like I'm trying to race the car next to me while I'm not. It is super annoying.
I've found that if I lift off the acceleration before I reach 2500 rpm in first gear then it shifts into 2nd and things get normal from there on. However, that's not a viable solution as it sort of jerks the car.
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BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
Yes this is normal and intended operating/shift mapping for this car as the mapping is economy focussed.
I tend to use individual mode, with the transmission in sport setting to avoid this as I'd rather have a 'normal' transmission response than the rather weird comfort mode map.
I could live with this if they could solve the jerky transmission, which oddly this last few days has been ok and only the first 1 or 2 shifts after the car starts being snatchy.
Still a darn poor 'box in my opinion, lord knows who signed this off.
I tend to use individual mode, with the transmission in sport setting to avoid this as I'd rather have a 'normal' transmission response than the rather weird comfort mode map.
I could live with this if they could solve the jerky transmission, which oddly this last few days has been ok and only the first 1 or 2 shifts after the car starts being snatchy.
Still a darn poor 'box in my opinion, lord knows who signed this off.
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2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
MBWorld Fanatic!
Joined: Jan 2015
Posts: 2,075
Likes: 59
From: Manchester, UK
BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
Thread Starter
Senior Member
Joined: Nov 2016
Posts: 268
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2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
MBWorld Fanatic!
Joined: Jan 2015
Posts: 2,075
Likes: 59
From: Manchester, UK
BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
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Thread Starter
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2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
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CLS
My transmission is super annoying and it's not the rough shifting issue described in other posts. Shifting is smooth, but under normal acceleration in 1st gear it revs up to ~3500 rpm before shifting into 2nd then milliseconds later into 3rd. From the 3rd up everything is normal.
Below is an attempt at a visual representation of the gear-acceleration of what it should be (1st line) vs. what it actually is (2nd line):
-----1-----/-----2-----/-----3-----/-----4-----/-----5-----...
----------1--------/-2-/-----3-----/-----4-----/-----5-----...
I've read in one of the posts that it is possible to have the transmission re-programmed but it takes 2 service techs + a laptop + a long drive.
Does anyone have any information on how to request this without the dealer saying "there's no such thing" or denying that such procedure can be performed at all? I need some proof that it can be done/has been performed before.
Also, I'm pretty sure if I ask whether there's a software update for my transmission the dealer will say "sorry, no".
I've had it reset (not re-programmed) by the dealer but the shifting pattern didn't change.
This is a 2017 C300 with the 7G transmission.
As a side note: every time I move off at a green light the high rpm sounds like I'm trying to race the car next to me while I'm not. It is super annoying.
I've found that if I lift off the acceleration before I reach 2500 rpm in first gear then it shifts into 2nd and things get normal from there on. However, that's not a viable solution as it sort of jerks the car.
Below is an attempt at a visual representation of the gear-acceleration of what it should be (1st line) vs. what it actually is (2nd line):
-----1-----/-----2-----/-----3-----/-----4-----/-----5-----...
----------1--------/-2-/-----3-----/-----4-----/-----5-----...
I've read in one of the posts that it is possible to have the transmission re-programmed but it takes 2 service techs + a laptop + a long drive.
Does anyone have any information on how to request this without the dealer saying "there's no such thing" or denying that such procedure can be performed at all? I need some proof that it can be done/has been performed before.
Also, I'm pretty sure if I ask whether there's a software update for my transmission the dealer will say "sorry, no".
I've had it reset (not re-programmed) by the dealer but the shifting pattern didn't change.
This is a 2017 C300 with the 7G transmission.
As a side note: every time I move off at a green light the high rpm sounds like I'm trying to race the car next to me while I'm not. It is super annoying.
I've found that if I lift off the acceleration before I reach 2500 rpm in first gear then it shifts into 2nd and things get normal from there on. However, that's not a viable solution as it sort of jerks the car.
Newbie
Joined: May 2017
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2017 c300 sedan
I have a 2017 c300 in Canada. I have the exact same symptoms as you in comfort mode. The dealer told me this is normal and it's for fuel saving or something. I find that driving in sport mode but gentler on the pedal is perfect transmission shifts. Then in sport + mode if I'm pressing 3/4 on the pedal, it goes 1st gear to 5krpm, then 2nd followed by third quick. Full throttle no issues.
In comfort mode you have to drive slower than a corolla for 1st to shift at 2,5k rpm into 2nd. So annoying. I would love to hear a success story on fixing this, it's one of my biggest gripes about the car.
In comfort mode you have to drive slower than a corolla for 1st to shift at 2,5k rpm into 2nd. So annoying. I would love to hear a success story on fixing this, it's one of my biggest gripes about the car.
Newbie
Joined: May 2017
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2017 c300 sedan
Edit: it was Markham Mercedes that told me it was normal and nothing to be done about it.
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2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
Former Member
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CLS
I was at my wits end in the U.S. and read about their success. I was told by the SA that as a company store, a merc was merc.
Thornhill Canada, that's the one.
Thread Starter
Senior Member
Joined: Nov 2016
Posts: 268
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2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
Thread Starter
Senior Member
Joined: Nov 2016
Posts: 268
Likes: 21
2017 Mercedes-Benz C300, 2017 Mercedes-Benz GLC300
I just got off the phone with them. The SM is leaving for the day so I won't be able to see him before tomorrow.
Anyway, they told me his name was Ronnie. Do you think he's the same person who took care of your car?
Anyway, they told me his name was Ronnie. Do you think he's the same person who took care of your car?
Former Member
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CLS
https://www.mercedes-benz-thornhill.ca/about-us/staff/
I dealt with Ronnie and Dominic as shown above: both top drawer guys.
Dominic is the guy who said that to them, a merc is a merc. Smart.
I dealt with Ronnie and Dominic as shown above: both top drawer guys.
Dominic is the guy who said that to them, a merc is a merc. Smart.
Member
Joined: Dec 2014
Posts: 193
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2018 C300
My 2014 W204 shifts exactly the same way. The programming has been this way for a while. It's better in any mode other than comfort. I'm going to have the dealer update my software to see if it helps any, but since you guys are reporting the same pattern on the W205 my guess is it's by design and not something that will be "fixed".
