auto transmission jolt in sports mode

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Jul 4, 2020 | 10:23 PM

Mathew Giddey

Thread Starter

Junior Member

Joined: Feb 2020

Posts: 16

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2016 c63s sedan

auto transmission jolt in sports mode

I have a C63s 2016 amg and was wondering has anyone had a problem when they have their car in sports mode and when driving to say slow down to a set of lights from 2nd to first they get a shocking jolt when changing down gears? Has anyone had this and whats the procedure to reset the transmission module? I tried the accelerator procedure but did nothing. I also had the gear oil changed recently to see if it would help.

Jul 4, 2020 | 10:40 PM

Ksun_w205

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Joined: Jan 2017

Posts: 136

Likes: 21

W205 C63 S

I experience the exact same thing in sport+, never drove in sport before lol. I think this is just the nature of these transmissions as others have experienced the same thing. I usually just drive in manual and down shift at higher rpm's so I can hear the pops and avoid this jerk

Jul 4, 2020 | 10:46 PM

jherm

Senior Member

Joined: Dec 2016

Posts: 257

Likes: 28

C63S

Jerky transmission at low speeds in sport+ mode is a common issue. The TCU update done in conjunction with the much discussed exhaust software update resolves the issue.

Jul 4, 2020 | 11:37 PM

Ksun_w205

Member

Joined: Jan 2017

Posts: 136

Likes: 21

W205 C63 S

Quote:

Originally Posted by jherm

Jerky transmission at low speeds in sport+ mode is a common issue. The TCU update done in conjunction with the much discussed exhaust software update resolves the issue.

Is there a way to tell if TCU has been updated? I got the engine update for the pops/crackles but I still get jerky shifts at low speeds in sport+

Jul 4, 2020 | 11:42 PM

jherm

Senior Member

Joined: Dec 2016

Posts: 257

Likes: 28

C63S

Quote:

Originally Posted by Ksun_w205

Is there a way to tell if TCU has been updated? I got the engine update for the pops/crackles but I still get jerky shifts at low speeds in sport+

Believe the only way to determine the TCU version is hooking it up to the MB computers.

If you got that engine update then the TCU should have been done at the same time. Perhaps that is not the issue here.

Jul 5, 2020 | 12:22 AM

koifysh

Super Member

Joined: Nov 2016

Posts: 568

Likes: 132

2007 E350

Same problem here so i’m wondering if a tcu tune would fix this problem. Imm also getting weistec trans upgrade to hand all the torque from pure900 turbos

Jul 5, 2020 | 01:32 AM

Ksun_w205

Member

Joined: Jan 2017

Posts: 136

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W205 C63 S

I think its just the nature of these transmissions. They where never known to be smooth

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Jul 5, 2020 | 01:40 AM

Ksun_w205

Member

Joined: Jan 2017

Posts: 136

Likes: 21

W205 C63 S

Quote:

Originally Posted by amg8

Mine is very smooth...I have all updates though...

You don't feel any shifting at all when slowing down? The dealer told me its just how the transmission is and some other owners said as well. I'm envious of your transmission lol

Jul 6, 2020 | 11:57 AM

#10

C3504matic

Senior Member

Joined: Oct 2013

Posts: 418

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From: Edmonton AB

2015 C63S ,DME Tune, KW Has ,Kmac Bushings,BC Forged wheels,Gt Rotors,Porterfield R4S,Modal Intake

Mine jolts 3 to 2 downshift only when cold

Jul 6, 2020 | 12:43 PM

#11

C63Texas

Newbie

Joined: Jun 2020

Posts: 9

Likes: 1

From: Dallas, Texas

2018 C63 Sedan

My transmission is also jerky in Sport+ (which I think is expected because the transmission is wanting to be aggressive for spirited driving), but quite smooth for the most part in Sport. I might call a local shop that is AMG certified to verify the TCU upgrade, as Merc likes to avoid fixing stuff lol I've noticed. They tend to act dumb so they can focus on making $$$ on customers that are out of warranty.

Jul 6, 2020 | 02:59 PM

#12

Ksun_w205

Member

Joined: Jan 2017

Posts: 136

Likes: 21

W205 C63 S

Mine also only slightly jolts when cold and when warmed up it is a lot better but I just feel slight down shifting per say from 3 to 2

Jul 6, 2020 | 04:57 PM

#13

36EGMA

Junior Member

Joined: Jan 2018

Posts: 45

Likes: 1

From: NYC

C63s

Mines jolts from 2nd to 1st pretty hard. So annoying

Jul 7, 2020 | 01:50 PM

#14

C63Texas

Newbie

Joined: Jun 2020

Posts: 9

Likes: 1

From: Dallas, Texas

2018 C63 Sedan

Quote:

Originally Posted by 36EGMA

Mines jolts from 2nd to 1st pretty hard. So annoying

I really think it's how our transmission is built when in Sport +. I think Sport + is ready for track mode haha.

Jul 5, 2024 | 04:43 AM

#15

See63r

Junior Member

Joined: Nov 2021

Posts: 15

Likes: 1

2020 c63s coupe

Any update on this? I noticed the harsh jerk from 2nd to 1st coming to a dead stop. Unless I shift manually down to 1st before the car stops.

Jul 5, 2024 | 01:54 PM

#16

superswiss

Out Of Control!!

Joined: Nov 2018

Posts: 11,403

Likes: 5,325

From: San Francisco Bay Area

2019 C63CS

Quote:

Originally Posted by See63r

Any update on this? I noticed the harsh jerk from 2nd to 1st coming to a dead stop. Unless I shift manually down to 1st before the car stops.

Looks like you have a FL. My 2019 did this at first, but it went away on its own. I had to let it adapt to my city driving. It now stays in 2nd until I've come to a fell stop. If I'm still moving a bit it stays in 2nd gear, so for brief/rolling stops it doesn't downshift to 1st. It took a few thousand miles before it adapted. Don't remember at what mileage, but my first 7000 miles were mostly German Autobahn, so city driving was a bit rough until the car arrived in the USA and I did more city driving. Also there were several campaigns for the AMG Drive Unit. The 2019 and 2020 models were incorrectly coded from the factory, So make sure your car had all the updates. I've gotten some ECU updates as well that seem to further improve the transmission.

Jul 6, 2024 | 03:12 PM

#17

shmumbles

Newbie

Joined: Jul 2024

Posts: 2

Likes: 0

From: Reno, NV

2020 C63s Coupe

Mine does this as well. Roll to a stop and it jolts into first. Dealership found no problems but my dealership is not really good so who knows. They say it's up to date.