Help! Test to See if your C43 Does This (Buckling after downshift to first gear)
Thread Starter
Junior Member
Joined: Jul 2016
Posts: 19
Likes: 1
2018 C43 AMG
Help! Test to See if your C43 Does This (Buckling after downshift to first gear)
Hi everyone I hope you have a great weekend ahead of you. I've had a problem with my 2018 c43 w205 that I'm hoping this group can help me find out if this is a flaw in design or if my car has an issue. Basically the issue is it buckles back and forth when I apply the gas just after it has down shifted to first gear while in sport+ mode. If you want to help, the steps are below of exactly how to re-create this, please test and let me know your results.
Here's how to re-create:
My car is under warranty, I took it to the dealer and they said the transmission comes back with no error codes, so "nothing to fix." Ran a search and the closest I could find was this https://mbworld.org/forums/c-class-w...ift-issue.html but it's actually a different issue.
Anyone testing this and reporting back would help me to figure out if I need to open a case with MB or if every C43 is like this.
THANK YOU!!
Here's how to re-create:
- Set to Sport+ mode, automatic (not manual/paddle mode)
- Set main display so you can see when the vehicle changes gears
- Drive the car up to 2nd or 3rd gear, then let it slow down so it shifts from 2nd to first
- The instant you see the car shift from second to first gear apply the gas as if you were accelerating after making a turn
My car is under warranty, I took it to the dealer and they said the transmission comes back with no error codes, so "nothing to fix." Ran a search and the closest I could find was this https://mbworld.org/forums/c-class-w...ift-issue.html but it's actually a different issue.
Anyone testing this and reporting back would help me to figure out if I need to open a case with MB or if every C43 is like this.
THANK YOU!!
Last edited by mmgwd; Apr 29, 2022 at 09:22 AM.
MBWorld God!
Joined: Dec 2019
Posts: 32,325
Likes: 6,310
That is commonly known as the "bunny hop" behaviour. It is normal at least for the C43. The first gear's gear ratio is short so the throttle is extremely sensitive in first gear. Installing software updates to the TCU mitigates this because MB received complains so they tuned the software. It doesn't bother me anymore as when it happens I just upshift manually or instead of hesitating with my throttle input, I straight up floor it. Mines is a 2017 by the way and I believe I experienced this since I got it new.
Member
Joined: Nov 2021
Posts: 245
Likes: 105
From: New England Area
2015 ML63
Yup i completely agree, i got my 2017 C43 about 6 months ago, if you're light on the throttle in first gear, sport+ mode, i call it a first gear lurch, like you said. dont hesitate with the throttle in first, same thing coming to a stop with shifting, people say it has a hard downshift, you just have to find the right rpms while downshifting
Thread Starter
Junior Member
Joined: Jul 2016
Posts: 19
Likes: 1
2018 C43 AMG
Thanks for replies. It's hard to tell if what I'm experiencing what others are describing, mine sounds a little different but maybe one of you can tell me: Mine doesn't do it at any time unless I press the gas right after it downshifts to first. It doesn't matter if I push the gas hard or if I ease into it, the entire car will jolt back and forth and it will never stop jolting unless I let off of the gas. If it starts jolting and I press the gas harder it will just continue to jolt the entire car back and forth.
What do you think, same thing?
What do you think, same thing?
Junior Member
Joined: Jun 2021
Posts: 15
Likes: 2
mercedes-benz c450 amg
Thanks for replies. It's hard to tell if what I'm experiencing what others are describing, mine sounds a little different but maybe one of you can tell me: Mine doesn't do it at any time unless I press the gas right after it downshifts to first. It doesn't matter if I push the gas hard or if I ease into it, the entire car will jolt back and forth and it will never stop jolting unless I let off of the gas. If it starts jolting and I press the gas harder it will just continue to jolt the entire car back and forth.
What do you think, same thing?
What do you think, same thing?
Trending Topics
Out Of Control!!
Joined: Nov 2018
Posts: 11,427
Likes: 5,336
From: San Francisco Bay Area
2019 C63CS
Hi everyone I hope you have a great weekend ahead of you. I've had a problem with my 2018 c43 w205 that I'm hoping this group can help me find out if this is a flaw in design or if my car has an issue. Basically the issue is it buckles back and forth when I apply the gas just after it has down shifted to first gear while in sport+ mode. If you want to help, the steps are below of exactly how to re-create this, please test and let me know your results.
Here's how to re-create:
My car is under warranty, I took it to the dealer and they said the transmission comes back with no error codes, so "nothing to fix." Ran a search and the closest I could find was this https://mbworld.org/forums/c-class-w...ift-issue.html but it's actually a different issue.
Anyone testing this and reporting back would help me to figure out if I need to open a case with MB or if every C43 is like this.
THANK YOU!!
Here's how to re-create:
- Set to Sport+ mode, automatic (not manual/paddle mode)
- Set main display so you can see when the vehicle changes gears
- Drive the car up to 2nd or 3rd gear, then let it slow down so it shifts from 2nd to first
- The instant you see the car shift from second to first gear apply the gas as if you were accelerating after making a turn
My car is under warranty, I took it to the dealer and they said the transmission comes back with no error codes, so "nothing to fix." Ran a search and the closest I could find was this https://mbworld.org/forums/c-class-w...ift-issue.html but it's actually a different issue.
Anyone testing this and reporting back would help me to figure out if I need to open a case with MB or if every C43 is like this.
THANK YOU!!
No it isn't. The C63 is. The C43 has a torque converter, but with an aggressively tuned lockup clutch.
Last edited by superswiss; Apr 29, 2022 at 05:55 PM.
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Super Member
Joined: Oct 2019
Posts: 841
Likes: 315
C43
I had this problem a few years ago when I first bought my c43. It happens very infrequently now - which I attribute to learning how the car wants/likes to be driven. In lower gears while in Sport+, the car does not like 1/4 or 1/3 throttle acceleration. Your mileage may vary.
Newbie
Joined: May 2019
Posts: 6
Likes: 1
AMG c43
Bunny Hop fixed with recall?
OK. So this guy (
) claims the bunny hop behavior on his C43 was fixed with recall 2018040007 (see attachment). I think he is saying that as part of the safety recall (seatback lock) that there was an ECM update included that fixed the problem. True or untrue?
Thread Starter
Junior Member
Joined: Jul 2016
Posts: 19
Likes: 1
2018 C43 AMG
OK. So this guy (https://www.youtube.com/watch?v=0cf2T2U2lg8&t=111s) claims the bunny hop behavior on his C43 was fixed with recall 2018040007 (see attachment). I think he is saying that as part of the safety recall (seatback lock) that there was an ECM update included that fixed the problem. True or untrue?
Senior Member
Joined: May 2004
Posts: 474
Likes: 36
From: Central Ohio
2017 C43, 1966 230SL, 2006 Jeep Rubicon
Last edited by GermanCarShow; Jul 26, 2022 at 12:18 AM.
