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      11-26-2017, 02:52 AM   #1
Schuey
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DCT lurch/surge in first gear while in D mode

Hi Folks,

Hoping you can help me with an issue I seem to have developed on my 2017 M4 CP since this Friday after having the full 2017 software update done for the car taking it to integration level F020-17-11-521.

I never experienced this before pre-software update and my car is coming to a year old now with 5673 miles on the clock. I experience this surge/jerk only in 1st gear when driving in Auto mode D1 setting when revs are low between 1K - 1.5K. Just as I'm pulling off once moving at around 5-10mph it suddenly feels like a little jerk as if I've quickly dabbed the throttle again (but I haven't as I'm nice and smooth). I've given it a thorough test yesterday and I cannot replicate the issue in any of the following settings:

- Auto D2 or D3
- Manual mode, gearbox speeds 1, 2 or 3
- Manual mode S1, S2, S3

It only happens in 1st gear Auto mode D1 setting since the full 2017 software update. Does anyone else experience this or can share any feedback? It's one been 2 days since the update but it's ruining the driving experience for me. Could it be the car is learning my driving style again since the software update and will smooth out over the next few days or do you think there is a problem somewhere down the line? Thing is I never had any issues at all really pre software update so it all seems a bit of a coincidence. Plus as I cannot replicate issue in manual mode to me it suggests it's not a hardware issue

Many thanks in advance all, will appreciate any input.

Last edited by Schuey; 11-26-2017 at 02:59 AM..
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      11-26-2017, 12:49 PM   #2
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Quote:
Originally Posted by Schuey View Post
Hi Folks,

Hoping you can help me with an issue I seem to have developed on my 2017 M4 CP since this Friday after having the full 2017 software update done for the car taking it to integration level F020-17-11-521.

I never experienced this before pre-software update and my car is coming to a year old now with 5673 miles on the clock. I experience this surge/jerk only in 1st gear when driving in Auto mode D1 setting when revs are low between 1K - 1.5K. Just as I'm pulling off once moving at around 5-10mph it suddenly feels like a little jerk as if I've quickly dabbed the throttle again (but I haven't as I'm nice and smooth). I've given it a thorough test yesterday and I cannot replicate the issue in any of the following settings:

- Auto D2 or D3
- Manual mode, gearbox speeds 1, 2 or 3
- Manual mode S1, S2, S3

It only happens in 1st gear Auto mode D1 setting since the full 2017 software update. Does anyone else experience this or can share any feedback? It's one been 2 days since the update but it's ruining the driving experience for me. Could it be the car is learning my driving style again since the software update and will smooth out over the next few days or do you think there is a problem somewhere down the line? Thing is I never had any issues at all really pre software update so it all seems a bit of a coincidence. Plus as I cannot replicate issue in manual mode to me it suggests it's not a hardware issue

Many thanks in advance all, will appreciate any input.

Mine does this, it’s normal from what my tech tells me.
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      11-26-2017, 10:23 PM   #3
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Welcome to the club. Normal apparently.

Anyone have experience with Porsche PDK? Similar issues?
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      11-26-2017, 10:45 PM   #4
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Look into the GTS flash. Since I got it Shifts are much smoother if there is any jerking is only when I’m not discipline enough with the gas pedal.
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      11-27-2017, 09:00 AM   #5
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Quote:
Originally Posted by Schuey View Post

I experience this surge/jerk only in 1st gear when driving in Auto mode D1 setting when revs are low between 1K - 1.5K.
It only happens in 1st gear Auto mode D1 setting
I'll skip over the "why in the World are you EVER driving in D1??" ...

Questions:

(1.) You say it happens in 1st gear - does that mean it's NOT shifting in to 2nd when the surge happens? I know the eco-modes try to get you to 7th as fast as possible ... if it is shifting to 2nd, that's why

(2.) Have you tried this in S1? i.e. all the same eco settings, but in S1 with the same throttle application - does it also happen in in 1st only? what happens when you shift to 2nd?

(3.) Have you tried S1, starting out in 2nd gear? What happens then?

I've got a 2015 that I picked up in 2014 - I'm going to try this as I have a 2018 on the way and it will be interesting to compare ...
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      11-27-2017, 10:59 AM   #6
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Quote:
Originally Posted by GrussGott View Post
I'll skip over the "why in the World are you EVER driving in D1??" ...

Questions:

(1.) You say it happens in 1st gear - does that mean it's NOT shifting in to 2nd when the surge happens? I know the eco-modes try to get you to 7th as fast as possible ... if it is shifting to 2nd, that's why

(2.) Have you tried this in S1? i.e. all the same eco settings, but in S1 with the same throttle application - does it also happen in in 1st only? what happens when you shift to 2nd?

(3.) Have you tried S1, starting out in 2nd gear? What happens then?

I've got a 2015 that I picked up in 2014 - I'm going to try this as I have a 2018 on the way and it will be interesting to compare ...
Thanks for your feedback, very interesting. Answers to your questions:

1. Yes, the surge happens when it's NOT shifting to second, it happens just before and then half a second later it shifts up to second, very weird.

2. I haven't tried Auto setting in S1, will give that a go and report back. Good idea

3. Will try that also.

Regards to driving in Auto D1, mines a daily driver and unfortunately I sit in traffic quite a bit of the time. So Auto mode in these circumstances makes perfect sense.

On weekends however, spirited drives, then M2 button depressed which is set to manual S2. S3 seems to unsettle the backend sometimes which for UK weather it's not perfect

Thanks.
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      11-27-2017, 11:05 AM   #7
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Quote:
Originally Posted by Groganrocket View Post
Mine does this, it’s normal from what my tech tells me.
Quote:
Originally Posted by batchelorc View Post
Welcome to the club. Normal apparently.

Anyone have experience with Porsche PDK? Similar issues?
Quote:
Originally Posted by LukeM15 View Post
Look into the GTS flash. Since I got it Shifts are much smoother if there is any jerking is only when I’m not discipline enough with the gas pedal.
Thank for the feedback guys, looks like I'm not alone then here
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      11-27-2017, 07:12 PM   #8
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Quote:
Originally Posted by Schuey View Post

So Auto mode in these circumstances makes perfect sense.
It might make sense, but it's no fun

I sit in traffic quite a bit and my car is always in s3 full beans mode - I actually find traffic easier this way because the engine's vacuum (actually, it's the closed throttle) to slow the car in 1st or 2nd.

but I was just razzin ya
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      11-27-2017, 07:46 PM   #9
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if you keep accelerating,(keep your foot in it), it will not lurch. Only does it if you let off the gas pedal ever so slightly.
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      11-27-2017, 08:03 PM   #10
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I had a similar thing happen in my car. It was a March 2015 build and I didn't change the software

it seemed to happen when i was using very light throttle at those low speeds in D1 DCT setting.

I resolved the issue by commuting in M2 DCT setting, and more throttle
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      11-27-2017, 08:16 PM   #11
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Quote:
Originally Posted by batchelorc View Post
Welcome to the club. Normal apparently.

Anyone have experience with Porsche PDK? Similar issues?
This has been a problem from the beginning with the DCT.
Much less noticeable or nonexistent on f10 M5.
I’m not sure of the 1series and 335is.
No such issue with pdk in 911, not sure about Macan or panamera.
Mine are 6MT and 7MT, but have extensive seat time in 911 pdk.
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      11-28-2017, 01:40 PM   #12
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Quote:
Originally Posted by Drtsk View Post
Quote:
Originally Posted by batchelorc View Post
Welcome to the club. Normal apparently.

Anyone have experience with Porsche PDK? Similar issues?
This has been a problem from the beginning with the DCT.
Much less noticeable or nonexistent on f10 M5.
I’m not sure of the 1series and 335is.
No such issue with pdk in 911, not sure about Macan or panamera.
Mine are 6MT and 7MT, but have extensive seat time in 911 pdk.
I had a 2011 335is with DCT before the F82. Never had this problem with that DCT.

This has been a known "issue" with this tranny since the beginning. Plenty of threads out there. It's a Sports+ throttle and Auto mode problem in 1st gear. OP needs to learn to modulate the throttle when using these settings.

Just drive in manual mode OP
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      11-30-2017, 01:22 AM   #13
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Quote:
Originally Posted by LukeM15 View Post
Look into the GTS flash. Since I got it Shifts are much smoother if there is any jerking is only when I’m not discipline enough with the gas pedal.
This. Alex @ Alpine MS did my GTS DCT Flash. love it.
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      11-30-2017, 02:00 AM   #14
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Just out of curiosity. For the people experiencing this, have you owned a manual car before the DCT? the descriptions sounds like the cars not shifting quick enough into second because the revs aren't high enough. This is completely normal. Also if you're not in d1, your revs will hold longer before it shifts
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      11-30-2017, 08:09 PM   #15
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My car lurches like crazy sometimes on slow launches almost completely independent of settings. Sometimes its fine and other times no matter how smooth I go its going to lurch (even in manual mode). Drives me nuts. Hopefully getting the software updated next week and we'll see if it helps.
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      11-30-2017, 08:16 PM   #16
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Quote:
Originally Posted by batchelorc View Post
Welcome to the club. Normal apparently.

Anyone have experience with Porsche PDK? Similar issues?
not in the slightest... people hate to hear it but the porsche pdk is a much better transmission. Super smooth if you want it to be but has zero problem ripping off incredibly fast and violent shifts if you are pushing it.
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      02-09-2018, 11:29 PM   #17
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My car too was just updated to this most recent software and I am also experiencing this surge/jerk in D1. Also have 5,000 miles on the clock and never had this problem before. This is not the same thing as the classic dct bucking issue. It’s an abrupt jolt where there was none prior to the update.

I reached out to OP and he was still dealing with this. Has anyone else experienced issues in D1 1st gear if they have updated their software? Is there anything the dealer can do to retroactively fix what this new software version may have done?
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      02-10-2018, 06:00 AM   #18
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Quote:
Originally Posted by Drtsk View Post
This has been a problem from the beginning with the DCT.
Much less noticeable or nonexistent on f10 M5.
I’m not sure of the 1series and 335is.
No such issue with pdk in 911, not sure about Macan or panamera.
Mine are 6MT and 7MT, but have extensive seat time in 911 pdk.
Agreed. I recently sold my 911 C4S with PDK. The PDK is flawless and, IMHO, far superior to the DCT in my 2018 M4. My M4 is a DD, I find it smoothest for city driving in my M2 setting which has everything dialed to Comfort settings.
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      02-10-2018, 08:33 AM   #19
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Why does everyone always upgrade their software? Every time I go into the dealer I tell them DO NOT do any software upgrades, the car is running perfect. It does not matter what industry you are talking about. Pretty much all software updates for anything these days is beta tested by the end user. Its not possible to test every aspect of software anymore. I write software for a living and we pretty much get it as stable as possible, ship it out and deal with the bugs afterward. This is industry standard for software development.

When things are working perfectly, just leave it alone. Having the latest is not always the greatest. HAHA
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      02-10-2018, 09:49 AM   #20
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Drive it manually and set off in 2nd, problem solved.
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      02-10-2018, 09:52 AM   #21
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Quote:
Originally Posted by radiofrequency View Post
Agreed. I recently sold my 911 C4S with PDK. The PDK is flawless and, IMHO, far superior to the DCT in my 2018 M4. My M4 is a DD, I find it smoothest for city driving in my M2 setting which has everything dialed to Comfort settings.
All companies get this. My 2017 Panny Turbo with a PDK gets the lurch in sport mode at about 40mph. Not a big deal, apparently it’s a software flash to fix but it happens to everyone.

Doesn’t happen to my M4 6MT though!
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      02-10-2018, 10:39 AM   #22
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Welcome to BMW DCT. Normal behavior.
Porsche PDK, is smooth as a butter
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