Rough auto downshift even in comfort?
Thread Starter
Newbie
Joined: Dec 2015
Posts: 4
Likes: 1
gle
Rough auto downshift even in comfort?
Hi All,
I have recently taken delivery of my 2018 c43 sedan! Everything is great except the rocking back and forth issue in S+ if I'm not mashing the throttle, and thanks to the insight on this forum, I have gotten the latest software update from the dealer.
However, this other issue that I have experience which was expected to be fixed by the update still exists, where even when I'm driving in comfort mode and auto shifting, when the car brakes to low speed u can certainly feel the rough downshifts from 3rd to 2nd and 2nd to 1st. It's like the car jumps a bit and the car suddenly brakes harder during those two shifts despite ur foot being steady and not applying anymore brakes.
I'm wondering if anyone else is currently experiencing it and if anyone has any knowledge on this?
Thanks in advance!
I have recently taken delivery of my 2018 c43 sedan! Everything is great except the rocking back and forth issue in S+ if I'm not mashing the throttle, and thanks to the insight on this forum, I have gotten the latest software update from the dealer.
However, this other issue that I have experience which was expected to be fixed by the update still exists, where even when I'm driving in comfort mode and auto shifting, when the car brakes to low speed u can certainly feel the rough downshifts from 3rd to 2nd and 2nd to 1st. It's like the car jumps a bit and the car suddenly brakes harder during those two shifts despite ur foot being steady and not applying anymore brakes.
I'm wondering if anyone else is currently experiencing it and if anyone has any knowledge on this?
Thanks in advance!
MBWorld Fanatic!
Joined: Feb 2008
Posts: 2,829
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'20 GLC300 SUV
How rough are the downshifts? Because what you're describing there is engine braking. Do the rough downshifts occur when braking gradually in C?
As far as the S+ issue is concerned, this is a common trait in modern performance cars with aggressive automatic and DCT transmissions. The M-DCT is especially brutal if you're unfamiliar with the transmission.
You have to either commit to the throttle fully in low speed situations in S+ (particularly through the first 2 gears) or make sure that you are gently "rolling" on the throttle with your foot vs. stabbing or bouncing it.
As far as the S+ issue is concerned, this is a common trait in modern performance cars with aggressive automatic and DCT transmissions. The M-DCT is especially brutal if you're unfamiliar with the transmission.
You have to either commit to the throttle fully in low speed situations in S+ (particularly through the first 2 gears) or make sure that you are gently "rolling" on the throttle with your foot vs. stabbing or bouncing it.
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Joined: Mar 2017
Posts: 1,026
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From: Omaha, NE
'16 AMG GTS, '21 AMG GLE53
I experience what equates to some additional torque braking when coming to full stops in C as the engine downshifts based on RPM minimums. Just one of the small quirks of the tranny, especially the S+. The one thing that comes to mind from your post though is if your car is actually dropping all the way in 1 when driving in comfort. It's my understanding that, unless manually shifted to 1, the lowest gear you should see in C is 2.
Super Member
Joined: Nov 2017
Posts: 711
Likes: 108
2018 Mercedes C43 AMG Coupe
Exact same thing happens to me as well. I don't think you should be alarmed. Aggressive gearing makes for unpleasant braking. This car ALWAYS engine brakes regardless of whether or not the actual brakes can handle it.
Sucks coming from a 10 year old Lexus with zero brake boost and weak brakes (makes for the smoothest stops, ever).
Sucks coming from a 10 year old Lexus with zero brake boost and weak brakes (makes for the smoothest stops, ever).
Thread Starter
Newbie
Joined: Dec 2015
Posts: 4
Likes: 1
gle
Thanks for the input everyone! That make sense, I figured it's the engine braking that's creating the slight jerky feeling but didn't think it would be so noticeable in Comfort, I guess that's what AMGs are all about haha.
Cheers
Cheers
Super Member
Joined: Jun 2018
Posts: 522
Likes: 35
AMG C43 3LV6
Hi All,
I have recently taken delivery of my 2018 c43 sedan! Everything is great except the rocking back and forth issue in S+ if I'm not mashing the throttle, and thanks to the insight on this forum, I have gotten the latest software update from the dealer.
However, this other issue that I have experience which was expected to be fixed by the update still exists, where even when I'm driving in comfort mode and auto shifting, when the car brakes to low speed u can certainly feel the rough downshifts from 3rd to 2nd and 2nd to 1st. It's like the car jumps a bit and the car suddenly brakes harder during those two shifts despite ur foot being steady and not applying anymore brakes.
I'm wondering if anyone else is currently experiencing it and if anyone has any knowledge on this?
Thanks in advance!
I have recently taken delivery of my 2018 c43 sedan! Everything is great except the rocking back and forth issue in S+ if I'm not mashing the throttle, and thanks to the insight on this forum, I have gotten the latest software update from the dealer.
However, this other issue that I have experience which was expected to be fixed by the update still exists, where even when I'm driving in comfort mode and auto shifting, when the car brakes to low speed u can certainly feel the rough downshifts from 3rd to 2nd and 2nd to 1st. It's like the car jumps a bit and the car suddenly brakes harder during those two shifts despite ur foot being steady and not applying anymore brakes.
I'm wondering if anyone else is currently experiencing it and if anyone has any knowledge on this?
Thanks in advance!
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Member
Joined: Sep 2017
Posts: 136
Likes: 28
From: Toronto
C43 2017
I took my 2018 in for first prepaid maintenance package and of course complained about jerky and indecisive shifting.Was told that there is no tranny update but there is a fuel update. The car is shifting way smoother and the engine just feels snappier.
Junior Member
Joined: Jan 2018
Posts: 71
Likes: 21
From: Lake Forest, CA
C43
This started happening to me too recently, never happened before. Every once in a while it feels like it's downshifting in S+ when I'm really in C or E mode. I'm only at 16k miles so if this indicative of a possible future problem I definitely want to get it looked at.
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Joined: Feb 2008
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'20 GLC300 SUV
MBWorld Fanatic!
Joined: Nov 2016
Posts: 1,527
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From: Toronto, ON
2021 Mercedes C63s AMG Coupe
If a lot of us are having this issue, which we are, having confirmed this in our whatsapp group, then I think it is kind of normal. Does not happen all the time, but shows up sometimes. My car is tuned, so I cannot be as aggressive with the service dept. as some of you guys might manage to with stock cars. How about one of guys give it a chase and see where it goes? It might be normal but certainly is not pleasant.
