C43 Rocking Back and Forth
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Junior Member
Joined: Jul 2016
Posts: 68
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2020 C63s AMG Coupe
C43 Rocking Back and Forth
Hi all - I received my C43 coupe a few weeks ago, and generally it has been a pleasure to drive. I am, however, having one issue that seems to come up in S+. Sometimes when I am accelerating from a stop (even at normal/soft accelerations), the car starts rocking/jerking back and forth about 2-6 times like it is stuck and unable to switch gear. It also actually won't go forward more than a few feet when this is happening, even though my foot is on the accelerator. I take my foot off the accelerator and, once the rocking has stopped, reapply and it goes forward fine.
Similarly, when coming to a stop in S+, the car will jerk back and forth very noticeably/uncomfortably. It seems to be more than just a regular downshift. This happens when I slowly come to a stop over a longer distance. Can't remember if it happens when I come to an abrupt stop.
I'm not sure if this is normal, something I am doing wrong, or an issue with my car. This is my first sports car, so I haven't run into anything like this before. Would appreciate if anyone has any suggestions/advice. Thanks in advance!
Similarly, when coming to a stop in S+, the car will jerk back and forth very noticeably/uncomfortably. It seems to be more than just a regular downshift. This happens when I slowly come to a stop over a longer distance. Can't remember if it happens when I come to an abrupt stop.
I'm not sure if this is normal, something I am doing wrong, or an issue with my car. This is my first sports car, so I haven't run into anything like this before. Would appreciate if anyone has any suggestions/advice. Thanks in advance!
Senior Member
Joined: Sep 2016
Posts: 438
Likes: 84
A Benz and a BMW
Hi all - I received my C43 coupe a few weeks ago, and generally it has been a pleasure to drive. I am, however, having one issue that seems to come up in S+. Sometimes when I am accelerating from a stop (even at normal/soft accelerations), the car starts rocking/jerking back and forth about 2-6 times like it is stuck and unable to switch gear. It also actually won't go forward more than a few feet when this is happening, even though my foot is on the accelerator. I take my foot off the accelerator and, once the rocking has stopped, reapply and it goes forward fine.
Similarly, when coming to a stop in S+, the car will jerk back and forth very noticeably/uncomfortably. It seems to be more than just a regular downshift. This happens when I slowly come to a stop over a longer distance. Can't remember if it happens when I come to an abrupt stop.
I'm not sure if this is normal, something I am doing wrong, or an issue with my car. This is my first sports car, so I haven't run into anything like this before. Would appreciate if anyone has any suggestions/advice. Thanks in advance!
Similarly, when coming to a stop in S+, the car will jerk back and forth very noticeably/uncomfortably. It seems to be more than just a regular downshift. This happens when I slowly come to a stop over a longer distance. Can't remember if it happens when I come to an abrupt stop.
I'm not sure if this is normal, something I am doing wrong, or an issue with my car. This is my first sports car, so I haven't run into anything like this before. Would appreciate if anyone has any suggestions/advice. Thanks in advance!
Super Member
Joined: Aug 2015
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.
I have something similar where the car (from a dead stop) gets "stuck" in first gear and very abruptly revs up and down, rocking the car, while it begins to progress forward. It mostly happens when I've applied medium pressure to the pedal...not enough ease for a slow smooth take off, and not enough punching it to register that I'm looking to redline it from the start. I describe this very much as the timing of the gear shifting being stuck and it just revs up and down in gear 1, without shifting up to 2, or running 1 up to redline.
Similarly, as I come to a stop, I also experience the jerks...this comes as it downshifts gear by gear and achieves higher RPM this time. This doesn't make for a smooth stop, but being in S+ and it trying to maintain high RPM in each gear, it makes sense.
All of the above happens only in S+ for me and I assume it is because it is trying to maintain high RPM per the programming.
Similarly, as I come to a stop, I also experience the jerks...this comes as it downshifts gear by gear and achieves higher RPM this time. This doesn't make for a smooth stop, but being in S+ and it trying to maintain high RPM in each gear, it makes sense.
All of the above happens only in S+ for me and I assume it is because it is trying to maintain high RPM per the programming.
Member
Joined: Apr 2016
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From: Bar cel ona
2016 C43 OMG
I experienced something like that at the beginning in Sport+ as well. After some tries, I've reached to the conclussion that I was stepping too hard on the pedal. In that mode (Sport+), I recommend to be as gentle as you can with the pedal, and you'll get the reaction that you're looking for.
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Super Member
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From: Philly and NYC
2019 E63S & 2022 X7 M50
This is bad...MB needs to step it up with their trannies...the 450 experiences instances of dead pedal during times of quick re-acceleration after deceleration. Only way for me to cure it is to drive in M mode
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Thread Starter
Junior Member
Joined: Jul 2016
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2020 C63s AMG Coupe
Thanks for all the replies. Your experiences sound right in line with my own. Is the answer then simply that we need to very gently accelerate from a dead stop until we are in higher gear? Or should this not be happening at all and so we should take it to the dealer?
Senior Member
Joined: Mar 2016
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C43 Coupe
I would call your dealer and see if some sort of software update can be done. I wonder if resetting the tranny would do anything. This has also happened to me the very first day, only in sports+. The car bounced back and forth in 1st gear. I'll try to reproduce it if I can, and take it to the dealer to show them.
Senior Member
Joined: Sep 2016
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A Benz and a BMW
It seems like most people that experienced this only had it happen a handful of times when driving the car fairly new. I would suggest anyone that experiences this consistently actually reach out to their dealer and have the honor the warranty!
Senior Member
Joined: Mar 2016
Posts: 406
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C43 Coupe
I wouldn't jump to conclusions just yet. This isn't a major problem either, more of an annoyance. Whether or not it is a real issue and if it'll lead to future problems is yet to be seen.
Super Member
Joined: Aug 2015
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.
The slight jerks as high RPMs are achieved on downshift while braking is consistent, but I believe that to be by design and I don't find it to be annoying.
Thread Starter
Junior Member
Joined: Jul 2016
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2020 C63s AMG Coupe
Did a bit more testing last night. It appears that this also happens when I am accelerating after a rolling stop at a stop sign, where I get down to about 5-10 MPH, then accelerate again. I'm trying to accelerate smoothly, but this still happens. I think that I may still be in a higher gear when I accelerate after the rolling stop, which causes my car to stutter and rock back and forth.
I guess I'll try to get the issue resolved with the dealer.
I guess I'll try to get the issue resolved with the dealer.
Senior Member
Joined: Mar 2016
Posts: 406
Likes: 49
C43 Coupe
Did a bit more testing last night. It appears that this also happens when I am accelerating after a rolling stop at a stop sign, where I get down to about 5-10 MPH, then accelerate again. I'm trying to accelerate smoothly, but this still happens. I think that I may still be in a higher gear when I accelerate after the rolling stop, which causes my car to stutter and rock back and forth.
I guess I'll try to get the issue resolved with the dealer.
I guess I'll try to get the issue resolved with the dealer.
Senior Member
Joined: Apr 2015
Posts: 399
Likes: 24
2017 C43 Sedan
Did a bit more testing last night. It appears that this also happens when I am accelerating after a rolling stop at a stop sign, where I get down to about 5-10 MPH, then accelerate again. I'm trying to accelerate smoothly, but this still happens. I think that I may still be in a higher gear when I accelerate after the rolling stop, which causes my car to stutter and rock back and forth.
I guess I'll try to get the issue resolved with the dealer.
I guess I'll try to get the issue resolved with the dealer.
Super Member
Joined: Aug 2003
Posts: 597
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From: San Jose
2016 C450 AMG, 2009 C300, 2001 C320 2001 CLK430, 95 E500
Did a bit more testing last night. It appears that this also happens when I am accelerating after a rolling stop at a stop sign, where I get down to about 5-10 MPH, then accelerate again. I'm trying to accelerate smoothly, but this still happens. I think that I may still be in a higher gear when I accelerate after the rolling stop, which causes my car to stutter and rock back and forth.
I guess I'll try to get the issue resolved with the dealer.
I guess I'll try to get the issue resolved with the dealer.
I used to find it, and still do sometimes when I've been accelerating, and de-celerate, coming to a stop or a slow down, CA stop is the worst and then try and get back on the throttle more than just gently / casually, and boom the car sputters and lurches and does this on/off lurching. It really quite annoying and I haven't found anything that can correct it. I've tried resetting the tranny now that the car is broken in and that didn't cure it.
Out Of Control!!
Joined: Jun 2004
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
so, this "issue" has been around for some time on C450 with the tranny 7g. I think it's more about something else, than the tranny though. Obviously tranny and engine sw.
I used to find it, and still do sometimes when I've been accelerating, and de-celerate, coming to a stop or a slow down, CA stop is the worst and then try and get back on the throttle more than just gently / casually, and boom the car sputters and lurches and does this on/off lurching. It really quite annoying and I haven't found anything that can correct it. I've tried resetting the tranny now that the car is broken in and that didn't cure it.
I used to find it, and still do sometimes when I've been accelerating, and de-celerate, coming to a stop or a slow down, CA stop is the worst and then try and get back on the throttle more than just gently / casually, and boom the car sputters and lurches and does this on/off lurching. It really quite annoying and I haven't found anything that can correct it. I've tried resetting the tranny now that the car is broken in and that didn't cure it.
this is the typical experience of the mct, cannot believe the new 7g tronic does this!!
Newbie
Joined: Sep 2016
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335i
Hi All
replying from Australia.
For what it's worth, I had the exact same experience while test driving the c43 coupe with the sales agent next to me. It happened about halfway through a 45 min test drive on pulling away from the kerb. In sports (or +) mode. I wasn't flooring the accelerator - just a gentle speed increase at which point the shuddering/rocking occurred. The agent couldn't explain it and it never happened again. I got the feeling something was awry with the transmission hunting through the gears somehow. Hopefully it resolves with use - don't some of these newer car transmissions "learn" your preferences over time?! Either that or a software update. Nevertheless the drive was so impressive that I have placed one on order!
replying from Australia.
For what it's worth, I had the exact same experience while test driving the c43 coupe with the sales agent next to me. It happened about halfway through a 45 min test drive on pulling away from the kerb. In sports (or +) mode. I wasn't flooring the accelerator - just a gentle speed increase at which point the shuddering/rocking occurred. The agent couldn't explain it and it never happened again. I got the feeling something was awry with the transmission hunting through the gears somehow. Hopefully it resolves with use - don't some of these newer car transmissions "learn" your preferences over time?! Either that or a software update. Nevertheless the drive was so impressive that I have placed one on order!
Junior Member
Joined: Jun 2009
Posts: 22
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From: Redwood City, CA
c32 amg, c43 amg
This happens to me too! Not very often but occasionally on sports +. I'm going to try and shift up manually next time it happens to see if it helps. Keep us posted if things change for you guys.
Senior Member
Joined: Mar 2016
Posts: 406
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C43 Coupe
I personally have not experienced it again since the first day. Shifting up manually or changing modes completely does indeed cause the lurching to cease.
Junior Member
Joined: Sep 2016
Posts: 24
Likes: 11
From: Markham, Ontario
2020 MB C43 Sedan AMG
I am seriously thinking of ordering a C43, however, coming from Japanese brands, I get concerned when I hear such transmission issues with brand new cars. I have driven the C450 and really loved it and the C43 is at least as good from what I hear. I was hoping the C43 9speed transmission would not have some of the problems that C450 owners have experienced.
I am patiently waiting and monitoring the threads. My 16 year old Type Still goinf strong but would love to get a C43.....
I am patiently waiting and monitoring the threads. My 16 year old Type Still goinf strong but would love to get a C43.....
Senior Member
Joined: May 2013
Posts: 320
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From: Winnipeg, Manitoba, Canada
2020 MB-AMG GLC43
Everyone needs to realize the gear ratios are very tight on the C43 - much tighter than the C63. Driving in Sport+ gracefully isn't easy but it definitely occurs after a major slow down and then punching it too fast. Your own foot rocking at this moment simply exacerbates the problem. I only just got mine - but noticed this on the demo and found myself adapting already. I don't think it is a problem - it is like popping the clutch too fast on a standard. I will check back on this forum after a few more days - trying to take it easy on the new car...
Senior Member
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A Benz and a BMW
From what i can gather, it seems to pop up when in Sport+ when you're sending some major power to the engine and then suddenly hit the brakes hard, and hit the gas hard again. I've experienced it too. Would it have played in to my purchase decision if I experienced it prior to purchase - nope. It's a car - every car has its quirks. The options are probably a software patch soon to prevent this, or they leave it as is for a few years and then tackle it down the road.
It's an interesting time for engines and their respective trannys....the N55 being replaced by a B58 that hasn't quite proven itself yet...and now this.
It's an interesting time for engines and their respective trannys....the N55 being replaced by a B58 that hasn't quite proven itself yet...and now this.
