9G Transmission Jerkiness in Stop-n-Go Traffic
Member
Joined: May 2018
Posts: 153
Likes: 5
C63S AMG Coupe
I just got my 2018 C63s coupe back from the 10,000 mile service. Of course new tires were needed, so I switched to the Michelin PS4S 265/295 combination. Seems like a totally different car - of course I always enjoy getting new tires, but the ride is better and so is the handling - as many here have also reported.
However, there were two software updates, and one of them has definitely changed the character of the transmission. The shifts seem a lot quicker and smoother. All told, it seems like I got a different car back and I can no longer fault the transmission. I would be interested in any feedback from others who have recently gotten program updates. I bought my car last February.
However, there were two software updates, and one of them has definitely changed the character of the transmission. The shifts seem a lot quicker and smoother. All told, it seems like I got a different car back and I can no longer fault the transmission. I would be interested in any feedback from others who have recently gotten program updates. I bought my car last February.
Thread Starter
Senior Member
Joined: Sep 2018
Posts: 397
Likes: 117
From: TX
IG: @amg.svr
The weather has been poor and so unfortunately I have not gotten around to testing AMG Dynamics yet.
I just wanted to update that going into manual mode is definitely the solution to jerkiness in heavy traffic. When you're just rolling along shifting between 2nd and 3rd, the car will keep suggesting you upshift into 4th. A fine strategy for casually going stoplight to stoplight but not really the best when it's stop-n-go.
The car has been a delight otherwise. Gets smoother and smoother and now I can really push that soundtrack.
I just wanted to update that going into manual mode is definitely the solution to jerkiness in heavy traffic. When you're just rolling along shifting between 2nd and 3rd, the car will keep suggesting you upshift into 4th. A fine strategy for casually going stoplight to stoplight but not really the best when it's stop-n-go.
The car has been a delight otherwise. Gets smoother and smoother and now I can really push that soundtrack.
Newbie
Joined: Mar 2021
Posts: 10
Likes: 3
2020 C63 AMG
I'm experiencing some jerkiness in 1st/2nd/3rd in stop and go traffic with the new 9G transmission. Shifts are not very smooth. However, it is fine with normal or spirited acceleration. I've only been driving in Comfort. 700+ miles on the odometer. Has anyone else experienced this?
Out Of Control!!
Joined: Nov 2018
Posts: 11,472
Likes: 5,357
From: San Francisco Bay Area
2019 C63CS
Welcome to MBWorld. This is an older thread when most of us just got our cars or were still waiting on them. I now have 18k miles on my coupe and it drives phenomenal. There have been a couple of service campaigns to fix issues related to the AMG Drive Unit for 2019/2020 models. They came coded wrong from the factory causing issues with the dynamic engine mounts and the rear differential. Nothing was specifically said about the transmission, but I can tell you that pretty much all the remaining jerkiness I had went away with these updates. The car drives much smoother now around town in Comfort mode and overall drives noticeably better. These updates came out during the second half of last year, so not very long ago. There's also a recall for the ESP, in case your car is affected by it. I do have to say that the car drove better and better over time. At 8000 miles or so there was a noticeable change in performance and how it drove. I still had some jerkiness in the transmission, but I also learned how to manage it. Still the software updates were a welcome improvement. It really drives very nice now. Kinda wish it drove like this much sooner. The stalling you are experiencing is something else, though. I haven't had that, but there were some folks who had similar issues with the car stalling at a stop and not restarting when ECO start/stop is turned on. I always turn it off, though, but some cars seem to have issues with it.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 1,537
Likes: 372
From: Austin, TX
2017 Porsche 911 C4
Start talking about the lemon law and MB buying back the car next time you speak with them. That will get their attention. If not, go directly to corporate MB North America and they will work with the dealership. If nothing comes from that, and you continue to having problems, then find the cheapest auto lawyer you can find because that is a clear black and white lemon law case heavily leaning in your favor.
Newbie
Joined: Dec 2021
Posts: 1
Likes: 0
GLE AMG53
GLE AMG53 Transmission
I just recently purchased a AMG 53 and experiencing the jerkiness that others are discussing at low gears. As I approach a stop sign, stop light or another vehicle, prompting me to brake, the transmission is very rough, often jerky and grabby feeling. I have taken the vehicle in twice and the dealership is stating it is characteristic of the vehicle which a very weak response. I am hearing from others is that is without question the 9-speed transmission that is being used by MB. Has anyone had success with a dealership fixing the problem? I have no desire to keep a vehicle that performs like this.
Out Of Control!!
Joined: Nov 2018
Posts: 11,472
Likes: 5,357
From: San Francisco Bay Area
2019 C63CS
I just recently purchased a AMG 53 and experiencing the jerkiness that others are discussing at low gears. As I approach a stop sign, stop light or another vehicle, prompting me to brake, the transmission is very rough, often jerky and grabby feeling. I have taken the vehicle in twice and the dealership is stating it is characteristic of the vehicle which a very weak response. I am hearing from others is that is without question the 9-speed transmission that is being used by MB. Has anyone had success with a dealership fixing the problem? I have no desire to keep a vehicle that performs like this.
Dealerships can't really do anything to change the characteristics of the transmission beyond replacing faulty parts and updating the software if available. Most often unpleasant behavior of the transmissions comes down to incomplete or incorrect adaptation. These transmissions learn and adapt on their own for the most part, but occasionally it can happen that the adaptation didn't go as planned due to specific driving situations. There are procedures to reset the adaptations or help it along that dealer techs can use to try to improve things, beyond updating the software to address known issues. At some point, though, the transmission is what it is and in an AMG it is tuned to provide more feedback and a more connected feel for better or worse.
Member
Joined: Jun 2021
Posts: 165
Likes: 34
C63
I've noticed on my 21 when it is cold, the first 5-10 minutes the car "can" be jerky if I am not careful with the throttle. If I feather it in off idle it will smoothly pull away but just a hint too much and it does the herky jerky dance up to 3rd gear. Once warm I noticed it is much less prevalent and not an issue for me now. Life with high performance power trains comes with quirks!
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