dejongj

But you can't The parking brake is an electronic button. In fact if you switch off the engine and open the door it gets applied automatically.

What you can do is apply the HOLD function with your foot brake, no need to switch to neutral, it is absolutely fine to roll up to a red light, come to a hold and apply the HOLD function whilst leaving it in drive. Just touch and go

decorily

So I didn't learn something new!
Yes I know about the hold and opening the door but presumed by previous post that hard pressing pedal in neutral also engaged park brake.

MercedesRat

Ok, I'll report back what I hear as well. Hopefully we'll get this figured out! Also, I'm sorry about your brake issue .

cahiil55k

My parking brakes do not auto-activate, although it's done this a few times in Park, it's not consistent. I park uphill on our driveway so I still do the old school place car in neutral before applying parking brake routine. It relieves the strain on the transmission.

The "stuck brake" issue was indeed the HOLD function! I'm not heavy footed, but the function apparently turns on at red lights if I apply just a tad too much brake pedal pressure during complete stop. Good call dejongj. Glad I'll just be showing the service center the hesitation/jerking issue now.

cahiil55k

Thanks MercedesRat. Fingers crossed that they don't just give the old "nature of the beast" explanation to us. BMW and MB love using that one.

davidjohnbamber

My first M-B was a 94 E320. I was told by my local tire company that the E320 had a "distributor less" ignition system, when they did an annual safety/emissions control inspection done. Unless times have changed I don't think that M-B has gone back to a points, or electronic ignition system using a distributor cap.

Gracie916

I have experienced this we well with my GLC 43, a total of 3 times in the last two weeks in Sport+ mode and so far not in any other modes. I just past the 1,500 mile mark as well. It is scary and embarrassing when it happens, and I thought that maybe I am just not experienced driving in such an aggressive mode? However, it makes no sense. So far, I noticed that it happens when I am driving in a slower speed limit zone and need to come to a stop. I typically do not drive in Sports+ often, unless I have room to zoom off, but I do not understand why it would jerk that forcefully period.

koojo

Almost sounds like a fuel cut off

cahiil55k

The car went in for a diagnosis and I was told this is due to the adaptive transmission. They said to drive it for 2000 miles and see if it still happens. I am not buying that. I've never heard of any Benz needing 2000 miles to adapt to driving habits, and even if that were true, why is the default mode violent and dangerous? I'll still let her break in and see if anything changes, but this is not good. It's supposed to be an AMG.

AverageGuy

I bought my car in mid December. I've been driving it quite a bit. Picked it up with around 15 miles, and now have nearly 3k on it. Yesterday, for the first time ever, my car did this. I do usually drive in S+, since I think the car feels too sluggish in any mode. This was the first time it did this, and it was jarring. My first thought was something with the transmission, but I'm not sure. I'll be out later today, if it does it again, I'll take it to the dealer.

I don't think this is normal at all.

-John

V70

A faulty turbo control valve in my wife's Volvo C30 acted like you are describing...

gainful

It is the torque converter of transmission. My Wife's GLK also has it.

I thought it is typical for all Merc.

dejongj

I'm not buying that either. Then again I have done nearly 4.5K miles, perhaps there is something in it. But logically it makes no sense to me.

Did they go out in a test drive with you? Also note there is another post here with someone requiring a new gearbox, may want to check that out.

begone

Mine was doing this, and sometimes would put itself into park which was very dangerous. Then I'd have this acceleration stall as if the fuel was being cut.

Long story short Im getting a new Transmission installed by dealer after sending a transmission oil sample to MB. I bought the car Dec 19th and it's been in the shop for 3 weeks going on 4.

cahiil55k

They didn't. They said they hooked it up to their computer and could not find any codes or other indicators anything is wrong so they assumed it was just the adaptations not fully setting. I'll look at the transmission thread, thanks for bringing that up. If the dealer weren't so far away, I'd be in there bugging them everyday but for now, time to drive back and forth is non-existent for me. I'll let someone else's GLC be the guinea pig for now (and thank them immensely for that)...guessing this is what my dealer is doing too.

dejongj

Wow so all they did was look at fault codes. I would have thought that if they had it hooked up they can see whether the adaption is complete or not. Sounds like a wasted journey. Sorry to hear that.

glj86

I did have this issue on my GLC300 in Sport+ mode only. As I am approaching a stop sign, it seems like the transmission is having trouble downshifting and there is a jerking and shuddering sensation, then it abruptly stops. It only happened twice about 3 weeks ago and it was the first time I used Sport+. It has not happened since.

l3m

Some of the C43 owners (W205) are also experiencing this problem.

https://mbworld.org/forums/c43-amg-c...ack-forth.html

I mentioned this problem in the AMG Private Lounge Community Forum and they asked that I contact my MB dealership and request them to open a service case (so-called "TIPS"). This will notify MB/AMG so can they can further investigate the issue.

Any 43 owner who has experienced this problem should have their local dealership open a TIPS service case.

darkh0rse

I'm having the same issue. Picked up my GLC43 about two weeks ago and this happened on the very first turn out of the dealership (was in Sport+). I didn't think much of it at the time but now it has been happening on a regular basis when driving in Sport+, albeit, not every single time. I'm taking it in later this week to try to replicate the issue with a tech in the car but was wondering if anyone got this fixed or know what the potential problem might be.

By the way, I owned a GLA45 and, at one point, a Macan Turbo. I'm used to driving in sport+. This is definitely not a "characteristic" of the car. When it happens it's downright dangerous as the car will violently jerk/buck (not to be mistaken with a hard shift) and has, on more than one occasion, forced to me to switch from sport+ to comfort just to get the car to accelerate properly.

darkh0rse

Figured I'd give an update on this.

I brought the car in and drove it with the tech in the car. Was able to replicate the severe jerking/jolting/bucking within 5 minutes. Tech agreed that it's not normal immediately. They did an update of some sort that they thought might fix it. I got the car back. Next day I started having the same problem. It's been a week and I've been able to replicate the issue several times in Sport+. I want to say it's happening less as of this update but that might be me compensating for the onset of the bucking.

Either way... looks like it's going to have to go back in. Super choked. Not only does it make the most fun part of the car unreliable but also dangerous. Confidence in an easy solution is now zero.

darkh0rse

Hi John, did you ever take your car in?

AverageGuy

I did not. It hasn't done it for a long time, so I've simply forgotten about it. It is warmer out now, maybe it was the weather?

Either way, I beat up on it pretty good, and it has taken it like a champ. No issues. I guess when it gets colder, I'll see if symptoms return.

-John

AverageGuy

I should add that I now have just over 7,800 miles on it.

cahiil55k

Just wanted to update this. I'm at almost 5K miles now and the GLC43 still does the scary hesitating/hopping thing and it seems to do it most when there's traffic coming at me fast while I'm trying to make a left turn. Anyway, I'm moving to a place 2 miles from the Benz dealership and will proceed to give them he11 for being such bullshidders.

wmc021

Hi
My experience is that if you want to use Sport + you need to be in a situation where you are going to nail the throttle and it will work a dream. If your in traffic or situations where your on and off the throttle your going to get this jerk as descried.

Comfort and sport should not have this issue, if that is the case I would be taking it to the dealer.
If it is only sport +.... remember this is setting the car up to go full performance and handle Accordingly.

If you use sport + in the right manner you can avoid this jerky throttle response.

I know your all thinking "but it should not be that way" and I tend to agree.
But it is a personality of Sport + "Go hard or go home"