GLC43 jerking when accelerating after near stop
Thread Starter
Member
Joined: Aug 2015
Posts: 141
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From: Upstate NY, USA
2017 Mercedes-AMG GLC43
GLC43 jerking when accelerating after near stop
Recreating this thread from the GLC Class (X253) forum.
To recap: This thread is intended for GLC43 / GLC63 owners whose vehicles exhibit a jerking / bucking behavior when applying partial throttle from a low speed. From the owners that have commented so far, it seems this behavior occurs most while the car is in Sport+ mode.
One owner (ajgraham) reported a successful fix via his dealers service department:
UPDATE 8/13/2018: An update from ajgraham. The previously mentioned fix doesn't fully address the issue:
To recap: This thread is intended for GLC43 / GLC63 owners whose vehicles exhibit a jerking / bucking behavior when applying partial throttle from a low speed. From the owners that have commented so far, it seems this behavior occurs most while the car is in Sport+ mode.
One owner (ajgraham) reported a successful fix via his dealers service department:
Sound the trumpets, a solution is here
Got my car back this morning after them having had it for 4 days. Basically they reproduced the harsh shifts and the scenario that was detailed previously.
If anyone is interested I can attach the Mercedes service documents for the work they did, it has a little more detail.
Got my car back this morning after them having had it for 4 days. Basically they reproduced the harsh shifts and the scenario that was detailed previously.
- They found a low voltage fault code on the gearbox, but they said that was not the cause of the issue.
- They checked assembly of transmission, no issues.
- Leak test and oil check on transmission, no issues.
- Bulletin LI27.00-P060741 relating to shifting complaints appears to involve updating control software on the transmission and they "performed torque converter lockup clutch adaptation and shifting adaptations".
If anyone is interested I can attach the Mercedes service documents for the work they did, it has a little more detail.
Last edited by FrostyZoob; Aug 13, 2018 at 11:08 PM. Reason: Update
Thread Starter
Member
Joined: Aug 2015
Posts: 141
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From: Upstate NY, USA
2017 Mercedes-AMG GLC43
I've got this issue as well. I'm on my 2nd visit to the dealer trying to get this addressed. I sent them copies of of ajgrahams invoice (see images above), pointed out the bulletin number (LI27.00-P060741) and asked them to install the associated update.
Result so far? They didn't install the update. (They said it was for GLCs with 4-cylinder engines.) They've asked me to describe when the problem occurs which I've done but they refuse to let me ride with a tech to show them. They've asked me to keep the car overnight. ("So the car can cool down." or somesuch.)
I'm not really thrilled with the service I'm getting but I'm not sure what else I can do. (Any advice here would be appreciated.) Until then...I guess I'll hope for the best and enjoy the loaner they gave me. (E300)
Result so far? They didn't install the update. (They said it was for GLCs with 4-cylinder engines.) They've asked me to describe when the problem occurs which I've done but they refuse to let me ride with a tech to show them. They've asked me to keep the car overnight. ("So the car can cool down." or somesuch.)
I'm not really thrilled with the service I'm getting but I'm not sure what else I can do. (Any advice here would be appreciated.) Until then...I guess I'll hope for the best and enjoy the loaner they gave me. (E300)
Junior Member
Joined: Oct 2017
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2017 GLC 43 Coupe
Yep same thing with my 17 GLC43, told dealer about it when making service appointment. When I went to pick it up they said they installed the latest tranmission software, but same issue still exists.
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Joined: Jul 2018
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2015 Porsche 911 GTS
2018 GLC63S coupe; happened tonight for the first time. Car has maybe 350 miles on it. Turned the car on, put it in sport, pulled out of a parking space and put it into sport+. Jerked around for a bit and then put it back into sport and it went away.
will try again tomorrow.
will try again tomorrow.
Super Member
Joined: Feb 2017
Posts: 703
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From: Northeast, USA
GLC43, GTI, X3, Mazda3
The throttle response in Sport+ is very "touchy" and probably not the best setting for the street. I've experienced the "jerking" a few times and certainly wakes you up. You either need to mash the throttle or use the paddles to overcome...kinda how these vehicles are meant to be driven.
I agree it's annoying and can be frightening when it happens, but will live with it, as I'm not sure MB's "fix" will do anything other than neuter the car. These vehicles can take the abuse, so mash away. Just my .02.
I agree it's annoying and can be frightening when it happens, but will live with it, as I'm not sure MB's "fix" will do anything other than neuter the car. These vehicles can take the abuse, so mash away. Just my .02.
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2015 Porsche 911 GTS
Understood about Sport+, however, all the other times I've been in Sport+ it has not exhibited this behavior. This was noticeably different, and not just a jerky start. I kept the pedal down to a constant degree and the car jerked on and off until I switched back to Sport.
Not sure I'm going to bother taking it in for this, but I'm pretty sure something's not right. I didn't notice if the GLC was actually changing gears last night while jerking.
Not sure I'm going to bother taking it in for this, but I'm pretty sure something's not right. I didn't notice if the GLC was actually changing gears last night while jerking.
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Thread Starter
Member
Joined: Aug 2015
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From: Upstate NY, USA
2017 Mercedes-AMG GLC43
Understood about Sport+, however, all the other times I've been in Sport+ it has not exhibited this behavior. This was noticeably different, and not just a jerky start. I kept the pedal down to a constant degree and the car jerked on and off until I switched back to Sport.
Not sure I'm going to bother taking it in for this, but I'm pretty sure something's not right. I didn't notice if the GLC was actually changing gears last night while jerking.
Not sure I'm going to bother taking it in for this, but I'm pretty sure something's not right. I didn't notice if the GLC was actually changing gears last night while jerking.
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Joined: Feb 2017
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From: Northeast, USA
GLC43, GTI, X3, Mazda3
Understood about Sport+, however, all the other times I've been in Sport+ it has not exhibited this behavior. This was noticeably different, and not just a jerky start. I kept the pedal down to a constant degree and the car jerked on and off until I switched back to Sport.
Not sure I'm going to bother taking it in for this, but I'm pretty sure something's not right. I didn't notice if the GLC was actually changing gears last night while jerking.
Not sure I'm going to bother taking it in for this, but I'm pretty sure something's not right. I didn't notice if the GLC was actually changing gears last night while jerking.
Newbie
Joined: Jan 2017
Posts: 13
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GLC43 AMG Coupe
Quick update. After back and forth with the dealer for almost two months, having my car for more than a month, changing the electronic chip and changing the entire gearbox. The problem wasn’t solved so I asked to speak to a service manager. He called me today to inform me that they have found the issue and it will be solved permanently. According to him it’s a faulty torque converter. They will replace it and I will have my car ready by Thursday.
will keep you posted.
will keep you posted.
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Joined: May 2008
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From: dfw
'10 C63
Quick update. After back and forth with the dealer for almost two months, having my car for more than a month, changing the electronic chip and changing the entire gearbox. The problem wasn’t solved so I asked to speak to a service manager. He called me today to inform me that they have found the issue and it will be solved permanently. According to him it’s a faulty torque converter. They will replace it and I will have my car ready by Thursday.
will keep you posted.
will keep you posted.
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GLC43 AMG Coupe
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2017 GLC43, 2009 Cadillac CTS-V
Anyone get this jerking behavior when slowly braking to a stop? It happens when releasing the brake, too, but it's intermittent and hard to reproduce when I want to make it happen to show my dealer.
I've had this since day 1 on my GLC43. I did get the dealer to update the transmission software, but that largely did nothing. I feel like it's a real problem, but have largely adapted my driving around it.
I've had this since day 1 on my GLC43. I did get the dealer to update the transmission software, but that largely did nothing. I feel like it's a real problem, but have largely adapted my driving around it.
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Myself more or less the same as you since new as well. (2017 with almost 50,000 kms now) Typically the worst when engine/tranny is cold or when in Sport+ at low speeds when shifting in and out of 1st and 2nd at low speeds. I've adapted how I drive to avoid it too, can't be bothered to push the issue with the dealer and possibly be stuck with a loaner for weeks when it seems there isn't a solution.
Anyone get this jerking behavior when slowly braking to a stop? It happens when releasing the brake, too, but it's intermittent and hard to reproduce when I want to make it happen to show my dealer.
I've had this since day 1 on my GLC43. I did get the dealer to update the transmission software, but that largely did nothing. I feel like it's a real problem, but have largely adapted my driving around it.
I've had this since day 1 on my GLC43. I did get the dealer to update the transmission software, but that largely did nothing. I feel like it's a real problem, but have largely adapted my driving around it.
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Joined: Mar 2018
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glc43 amg(sold) 2015 Mustang GT 2019 Volveo Inscription t6
Have had the"jerky when braking to stop issue" since day one. Transmission tear down twice, car out of service for two weeks, no results. Really feels like torque converters aren't
unlocking when coasting. Of course the service guys don't listen when I suggest that. Wouldn't have bought the car if the demo had driven like that. Does it in all modes. Learned to adapt too but not for much longer.
unlocking when coasting. Of course the service guys don't listen when I suggest that. Wouldn't have bought the car if the demo had driven like that. Does it in all modes. Learned to adapt too but not for much longer.
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Joined: Jan 2019
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Likes: 4
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Same issue here. This is by far the worst transmission I've used. Even American cars have smoother transmissions.
But then again, going from a Porsche with pretty much flawless transmission to a GLC43 was a downgrade.
Honestly can't wait to get rid of this car.
But then again, going from a Porsche with pretty much flawless transmission to a GLC43 was a downgrade.
Honestly can't wait to get rid of this car.
Super Member
Joined: May 2018
Posts: 600
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GLC63
so which is it? the thread seems to have started on this issue
"This thread is intended for GLC43 / GLC63 owners whose vehicles exhibit a jerking / bucking behavior when applying partial throttle from a low speed"
but some of you are describing an issue while braking. different problems I assume.
On the original issue, I experience it in my 19 GLC63 but only after first cold start of the day and immediately starting to drive in Sport+ or Individual mde which is mostly Sport+ for my setting.
Did that specific issue get any resolution whatsoever?
"This thread is intended for GLC43 / GLC63 owners whose vehicles exhibit a jerking / bucking behavior when applying partial throttle from a low speed"
but some of you are describing an issue while braking. different problems I assume.
On the original issue, I experience it in my 19 GLC63 but only after first cold start of the day and immediately starting to drive in Sport+ or Individual mde which is mostly Sport+ for my setting.
Did that specific issue get any resolution whatsoever?
Member
Joined: Sep 2006
Posts: 233
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From: Pennsylvania
2019 GLC 63, 2020 C43 coupe
This happens from time to time for me, but for the most part, I know exactly how to stop it quick so I don't look like an idiot now. My wife is still hesitant to go into sport + because of this.
Honestly, I think it's mostly self induced. And the super sensitive transmission in sport + makes it worse. When it does it initially, the back and forth motion forces your foot to sort of punch the pedal over and over until you either completely let off or basically floor it. You think your foot is staying still, because you are "holding" it motionless, but the jerking motion of the vehicle makes it worse. That exact type of motion is what makes a "bump-stock" function. Definitely irritating, but if you know what to do, it's less embarrassing
Honestly, I think it's mostly self induced. And the super sensitive transmission in sport + makes it worse. When it does it initially, the back and forth motion forces your foot to sort of punch the pedal over and over until you either completely let off or basically floor it. You think your foot is staying still, because you are "holding" it motionless, but the jerking motion of the vehicle makes it worse. That exact type of motion is what makes a "bump-stock" function. Definitely irritating, but if you know what to do, it's less embarrassing
Super Member
Joined: May 2018
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GLC63
This happens from time to time for me, but for the most part, I know exactly how to stop it quick so I don't look like an idiot now. My wife is still hesitant to go into sport + because of this.
Honestly, I think it's mostly self induced. And the super sensitive transmission in sport + makes it worse. When it does it initially, the back and forth motion forces your foot to sort of punch the pedal over and over until you either completely let off or basically floor it. You think your foot is staying still, because you are "holding" it motionless, but the jerking motion of the vehicle makes it worse. That exact type of motion is what makes a "bump-stock" function. Definitely irritating, but if you know what to do, it's less embarrassing
Honestly, I think it's mostly self induced. And the super sensitive transmission in sport + makes it worse. When it does it initially, the back and forth motion forces your foot to sort of punch the pedal over and over until you either completely let off or basically floor it. You think your foot is staying still, because you are "holding" it motionless, but the jerking motion of the vehicle makes it worse. That exact type of motion is what makes a "bump-stock" function. Definitely irritating, but if you know what to do, it's less embarrassing
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Joined: Sep 2017
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Same. Typically for me, probably said it before, it's at really slow speed usually after braking, then coasting for a second and then getting back on the throttle when in sport plus. IDK if it has something to do with it going from 2nd into 1st at this time or something else but it'll spill your coffee and snap yo neck.
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Joined: Sep 2006
Posts: 233
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From: Pennsylvania
2019 GLC 63, 2020 C43 coupe
"Essentially, bump stocks assist rapid fire by "throwing" the trigger against one's finger (as opposed to one's finger pulling on the trigger) thus allowing the firearm's recoil, plus constant forward pressure by the non-shooting arm, to actuate the trigger."
I'm not here trying to say that there isn't a problem with your GLC. Maybe there is, maybe there's not, but that's between you and your dealership/mechanic to decide. They will "look" at every issue you drag your ride back in for, even if they know there is no "real fix" just to make you think they are doing something about it. They will tear your gearbox apart and spread it all over the shop as many times as you ask them to, possibly creating other future issues in the process. I became very familiar with my ride, very quick, and for these reasons. I have not been back to the dealership one time since I signed the paperwork, and I plan to keep it that way. I won't even take the free car washes and yearly inspections option lol. I can repeat the bucking motion at will now, and I can also stop it at will, now that I understand what is going on. Maybe this info will help, maybe it won't. All I can do is type my opinion on what causes MY GLC to do this. My transmission is perfectly fine, and will remain unopened until I decide so
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Joined: May 2018
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GLC63
I know your not, and I even said so. The vehicle is moving around your foot as you hold it motionless if that makes sense. I'm not sure how else to explain what I'm saying. The only example I can think of this motion, is how a bump stock operates. Maybe this link will help understand better, but notice your trigger finger(foot) stays motionless as the gun(pedal) operates around you. Pure garbage, but they work.
"Essentially, bump stocks assist rapid fire by "throwing" the trigger against one's finger (as opposed to one's finger pulling on the trigger) thus allowing the firearm's recoil, plus constant forward pressure by the non-shooting arm, to actuate the trigger."
Is that not exactly what we have in Sport + mode?
I'm not here trying to say that there isn't a problem with your GLC. Maybe there is, maybe there's not, but that's between you and your dealership/mechanic to decide. They will "look" at every issue you drag your ride back in for, even if they know there is no "real fix" just to make you think they are doing something about it. They will tear your gearbox apart and spread it all over the shop as many times as you ask them to, possibly creating other future issues in the process. I became very familiar with my ride, very quick, and for these reasons. I have not been back to the dealership one time since I signed the paperwork, and I plan to keep it that way. I won't even take the free car washes and yearly inspections option lol. I can repeat the bucking motion at will now, and I can also stop it at will, now that I understand what is going on. Maybe this info will help, maybe it won't. All I can do is type my opinion on what causes MY GLC to do this. My transmission is perfectly fine, and will remain unopened until I decide so
"Essentially, bump stocks assist rapid fire by "throwing" the trigger against one's finger (as opposed to one's finger pulling on the trigger) thus allowing the firearm's recoil, plus constant forward pressure by the non-shooting arm, to actuate the trigger."
Is that not exactly what we have in Sport + mode?
I'm not here trying to say that there isn't a problem with your GLC. Maybe there is, maybe there's not, but that's between you and your dealership/mechanic to decide. They will "look" at every issue you drag your ride back in for, even if they know there is no "real fix" just to make you think they are doing something about it. They will tear your gearbox apart and spread it all over the shop as many times as you ask them to, possibly creating other future issues in the process. I became very familiar with my ride, very quick, and for these reasons. I have not been back to the dealership one time since I signed the paperwork, and I plan to keep it that way. I won't even take the free car washes and yearly inspections option lol. I can repeat the bucking motion at will now, and I can also stop it at will, now that I understand what is going on. Maybe this info will help, maybe it won't. All I can do is type my opinion on what causes MY GLC to do this. My transmission is perfectly fine, and will remain unopened until I decide so
If this was the case, wouldn't it happen all the time?
the car is jerking at constant pedal pressure. there is not fluctuating pedal position.
if you are replicating this at will then there is nothing wrong with your car, you are just doing weird **** with your gas pedal.
as far as quick transmission goes, flooring and releasing in rapid successions would confuse any modern auto transmission as it tries to figure out whether to downshift and go or stay at current speed and rpm. torque management system would also not like it.
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GLC63
Same. Typically for me, probably said it before, it's at really slow speed usually after braking, then coasting for a second and then getting back on the throttle when in sport plus. IDK if it has something to do with it going from 2nd into 1st at this time or something else but it'll spill your coffee and snap yo neck.
Member
Joined: Sep 2006
Posts: 233
Likes: 49
From: Pennsylvania
2019 GLC 63, 2020 C43 coupe
Super Member
Joined: Feb 2017
Posts: 703
Likes: 136
From: Northeast, USA
GLC43, GTI, X3, Mazda3
It's a throttle issue and you are crazy if you take it to a dealer and have them tear down the trans to find the "cause"...IMO. This isn't a Lexus LS. I believe in the manual it even states that you shouldn't be in Sport+ or driving like a bat out of hell until your trans warms up. The software is VERY aggressive in S+ and shifts aren't real smooth, even when warm, but they are quick and responsive. I agree the first time you experience it, you are like WTF, but it's all in probably millimeters of movement of the gas pedal on whether it happens or not and some can make it happen (or not) at will. If it's not to your liking, its probably not the vehicle for you...and that's ok. Some have been able to get a software update that helps fix it, but also neuters the vehicle from my understanding. Good luck.
