AMG C43 Transmission Questions
Out Of Control!!
Joined: Nov 2018
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From: San Francisco Bay Area
2019 C63CS
I still haven’t identified the root cause of the issue I’ve been experiencing. Yes, I think a late a shift is indeed causing the problem I’ve documented, but my question is “what is causing the late shift?” The suspension of my car was in Comfort mode when I last experienced the problem, so I’m not sure the suspension setting is the root cause. I still need to try adjusting the ESP to ESP Sport, as recommended earlier in this thread, to see if that helps with the transmission issue...
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Last edited by superswiss; Apr 14, 2021 at 07:42 PM.
Thread Starter
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2021 AMG C43
A late shift is very easy in 1st gear, because of how short it is. You have to shift a little early so that it doesn't hit the rev limiter in the time it takes to shift. I regularly bounce briefly off the rev limiter in 1st gear with my C63 if I don't watch it carefully. Not sure if you have the digital instrument cluster, but if you do, the whole cluster starts getting red and then flashes red when you need to shift. It's hard to miss, but sometimes my eyes and brain are not the same page .
.Last edited by sportsedan89; Apr 14, 2021 at 08:53 PM.
Thread Starter
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2021 AMG C43
1. The late and sluggish automatic shift from first to second gear, which jerks me forward in my seat. This behavior is not repeatable — sometimes the shift is crisp and smooth.
2. The vehicle intermittently failing to respond to my manual upshift request from first gear to second gear when I’ve got the accelerator pedal pushed pretty far down to the floor.
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2021 M550i
just re-read your post and it states its a 2021. how many miles do you have on it? the transmission has a learning curve where it tries to adapt to your driving style as well. 1st and 2nd has been identified to be a jerky gear in this car since the beginning. Whether it be from 2nd to 1st. Bucking bronco they have been calling it lol
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2021 AMG C43
just re-read your post and it states its a 2021. how many miles do you have on it? the transmission has a learning curve where it tries to adapt to your driving style as well. 1st and 2nd has been identified to be a jerky gear in this car since the beginning. Whether it be from 2nd to 1st. Bucking bronco they have been calling it lol
My car has about 1500 miles on it. Is your thought that maybe once the car completes a bit more of its learning process, the shifts could get a bit better?
I have another test I plan to perform tomorrow to try to narrow down the root cause of the late shift problem. I’ll report back with my findings.
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2021 M550i
the way i see it, your car is super young. technically the break in period is 1k miles, which means you have probably driven it little bit harder only a few hundred miles.
additionally, the car has many different combinations of driving modes and is sophisticated and computerized and you are trying to replicate an instance that has occurred, but not able to replicate it on command.
perhaps even by trying to drive it in 20 different ways within one session is even further confusing the computer lol. but yea, let us know what you find. by the way, what was your previous car?
additionally, the car has many different combinations of driving modes and is sophisticated and computerized and you are trying to replicate an instance that has occurred, but not able to replicate it on command.
perhaps even by trying to drive it in 20 different ways within one session is even further confusing the computer lol. but yea, let us know what you find. by the way, what was your previous car?
Thread Starter
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2021 AMG C43
the way i see it, your car is super young. technically the break in period is 1k miles, which means you have probably driven it little bit harder only a few hundred miles.
additionally, the car has many different combinations of driving modes and is sophisticated and computerized and you are trying to replicate an instance that has occurred, but not able to replicate it on command.
perhaps even by trying to drive it in 20 different ways within one session is even further confusing the computer lol. but yea, let us know what you find. by the way, what was your previous car?
additionally, the car has many different combinations of driving modes and is sophisticated and computerized and you are trying to replicate an instance that has occurred, but not able to replicate it on command.
perhaps even by trying to drive it in 20 different ways within one session is even further confusing the computer lol. but yea, let us know what you find. by the way, what was your previous car?
And yep, perhaps you’re right — maybe I just need to give it more time for the car to learn/adjust.
My previous car was a Kia Stinger GT. Prior cars were a VW Golf R, Audi S4, and VW GTI.
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nothing
There are two separate (but related) issues which I tried to spell out in my initial post:
1. The late and sluggish automatic shift from first to second gear, which jerks me forward in my seat. This behavior is not repeatable — sometimes the shift is crisp and smooth.
2. The vehicle intermittently failing to respond to my manual upshift request from first gear to second gear when I’ve got the accelerator pedal pushed pretty far down to the floor.
1. The late and sluggish automatic shift from first to second gear, which jerks me forward in my seat. This behavior is not repeatable — sometimes the shift is crisp and smooth.
2. The vehicle intermittently failing to respond to my manual upshift request from first gear to second gear when I’ve got the accelerator pedal pushed pretty far down to the floor.
Thread Starter
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2021 AMG C43
2. You won't be able to upshift if the rev is too high, above 6500RPM I believe. If you try to upshift at 7500RPM the CPU cuts power engine to bring it down to about 6500RPM and then upshifts. This is definitely by design and to protect transmission so that gear don't engage/disengage at high shaft speed.
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C43
The issue with clicking the upshift paddle and not having that respond after 1 click is a strange one. I do not have that issue in my 2020 C43. However, I do miss upshifts from 1st to 2nd sometimes due to how short the gear is. I would say if you can reliably reproduce a problem, then just take it to the dealership and show them. It doesn't hurt so just do it now while everything is still covered.
Also, if you don't put it in Manual mode (clicking the M), and you just pull the paddles while in full auto mode, then it will upshift automatically for you when it redlines. When you try it this way, has that shift from 1st to 2nd ever miss on the first try?
Also, if you don't put it in Manual mode (clicking the M), and you just pull the paddles while in full auto mode, then it will upshift automatically for you when it redlines. When you try it this way, has that shift from 1st to 2nd ever miss on the first try?
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2021 AMG C43
In full auto mode, I do sometimes get a delayed/sluggish shift from 1st to 2nd that jerks me forward in my seat. It's tough to say if I've hit the fuel cutoff or if I've just reached the low part of the torque curve. I'm not sure if I'd classify this as a "miss" given that the car does eventually shift on its own, but it definitely doesn't feel normal. This issue occurs intermittently — oftentimes, the 1-2 shift is timely and crisp, with no issues.
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C43
Unfortunately, I haven't yet been able to reliably reproduce the problem. If I can, I might take the car to the dealership. I plan to record a couple on-the-road videos in the next day or so to better illustrate the problems I'm facing.
In full auto mode, I do sometimes get a delayed/sluggish shift from 1st to 2nd that jerks me forward in my seat. It's tough to say if I've hit the fuel cutoff or if I've just reached the low part of the torque curve. I'm not sure if I'd classify this as a "miss" given that the car does eventually shift on its own, but it definitely doesn't feel normal. This issue occurs intermittently — oftentimes, the 1-2 shift is timely and crisp, with no issues.
In full auto mode, I do sometimes get a delayed/sluggish shift from 1st to 2nd that jerks me forward in my seat. It's tough to say if I've hit the fuel cutoff or if I've just reached the low part of the torque curve. I'm not sure if I'd classify this as a "miss" given that the car does eventually shift on its own, but it definitely doesn't feel normal. This issue occurs intermittently — oftentimes, the 1-2 shift is timely and crisp, with no issues.
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2021 AMG C43
Can you please explain why wheel slip could cause a delayed/sluggish shift?
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C43
It was rainy here today, so I didn’t get to do my testing. I plan to do my tests tomorrow — one of which will be with the stability program in ESP Sport. I’ll consider doing the test with traction control fully off too, but to be honest, that makes me a bit nervous 😅.
Can you please explain why wheel slip could cause a delayed/sluggish shift?
Can you please explain why wheel slip could cause a delayed/sluggish shift?
Thread Starter
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2021 AMG C43
I don't have a good answer for the delayed/missed shift, but I was guessing wheel slippage due to that lurch you felt. If the car is sending full power up to 5,000-6000 rpm and it loses traction from 1 or more wheels then it may cut power, which as the driver you will feel as if the car braked and you would lurch forward a bit.
