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      05-29-2018, 03:37 PM   #1
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DCT is trying to kill me

I havent found the time to take the dealer tech on a test drive, but now its on the high priority list for next week since my 135 tried to kill me. Like many I have a sometimes erratic DCT, well it could of killed me this past weekend.

I was approaching a red light, no one in front of me, was only going about 40ish, think I was in M tranny mode, maybe S. Slowing down for the light with intention of coming to a complete stop. The car wanted to still accelerate, full pressure on the brake pedal, and the car wont stop, its pushing me into the intersection. Luckily no car in any direction, so I let off the brake and go through red light. Car acted normal after that.... WTF! I have had a quick RPM blip make the car jump with a light foot on the break, but this was 3-4 seconds of it accelerating with foot firmly on the brake.

After all the reading I have done on this site, I never heard of this happening to anyone else?
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      05-29-2018, 03:57 PM   #2
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Quote:
Originally Posted by bagekko View Post
I havent found the time to take the dealer tech on a test drive, but now its on the high priority list for next week since my 135 tried to kill me. Like many I have a sometimes erratic DCT, well it could of killed me this past weekend.

I was approaching a red light, no one in front of me, was only going about 40ish, think I was in M tranny mode, maybe S. Slowing down for the light with intention of coming to a complete stop. The car wanted to still accelerate, full pressure on the brake pedal, and the car wont stop, its pushing me into the intersection. Luckily no car in any direction, so I let off the brake and go through red light. Car acted normal after that.... WTF! I have had a quick RPM blip make the car jump with a light foot on the break, but this was 3-4 seconds of it accelerating with foot firmly on the brake.

After all the reading I have done on this site, I never heard of this happening to anyone else?
Common DCT problem, I believe. Was the AC on? If so, there is an easy fix, you'll need to get a software patch. SIB 12-14-14? Lots of info on these threads about this.
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      05-29-2018, 05:40 PM   #3
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BMW should make a mandatory recall for that, that's extraordinarily dangerous for all parties...
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      05-29-2018, 06:12 PM   #4
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I'll post this yet again:

https://www.1addicts.com/forums/show....php?t=1402323

While I didn't have a situation like yours, I did have something similar where my car wanted to leap forward with my foot on the brake in stop and go traffic. I thought for sure I was going to nail the car in front of me. Then right after the car was in a false neutral mode where when I hit the gas to move with traffic, the car just sat there.

If you read my thread above, I've tried everything. And I think I'm the only one that has. PPK, SIB update, and Dinan S2 tune. I strongly feel what the tech did which I have posted in my thread was the actual fix for the problem. It's been over a year since the fix was put in place and the car drives near perfect.
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      05-29-2018, 07:58 PM   #5
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Quote:
Originally Posted by chris_flies View Post
BMW should make a mandatory recall for that, that's extraordinarily dangerous for all parties...
but of course...
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      05-30-2018, 08:49 AM   #6
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Quote:
Originally Posted by zx10guy View Post
I'll post this yet again:

https://www.1addicts.com/forums/show....php?t=1402323

While I didn't have a situation like yours, I did have something similar where my car wanted to leap forward with my foot on the brake in stop and go traffic. I thought for sure I was going to nail the car in front of me. Then right after the car was in a false neutral mode where when I hit the gas to move with traffic, the car just sat there.

If you read my thread above, I've tried everything. And I think I'm the only one that has. PPK, SIB update, and Dinan S2 tune. I strongly feel what the tech did which I have posted in my thread was the actual fix for the problem. It's been over a year since the fix was put in place and the car drives near perfect.
I really need to try this fix once I stop being lazy and replace the belt and tensioner.

Even though I've learned how to drive around it, since my entire commute is stop and go traffic and a divided 6 lane road, the lurching/lag/etc, is becoming incredibly tiresome.
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      05-30-2018, 09:14 AM   #7
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Quote:
Originally Posted by captain slowly View Post
but of course...
Not bashing the DCT here, just bashing BMW for allowing something like that to happen (seems a little common).
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      05-30-2018, 09:20 AM   #8
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Yeah that's the last thing I sent to my SA and he wants me to take the tech for drive before they do the procedure. That was almost 2 months ago and just been too busy. Thanks for posting the thread link as I was going to have to find it again as I started a new job and lost all my bookmarks.

I really need to get it fixed as I might be trading in the 135 if the right thing comes along. My sales guy knows I have a funky DCT and they took a bath on a Z4 with DCT issues that they could not resolve, of course your solution detail probably would of fixed it.

What baffles me is that everyone at dealers I frequent dont seem aware of DCT gremlins. Its still better than SMG! Perhaps this is why BMW chose slush sport auto for the new M5. Can I swap in a Porsche PDK cause theirs seems to be best.

Quote:
Originally Posted by zx10guy View Post
I'll post this yet again:

https://www.1addicts.com/forums/show....php?t=1402323

While I didn't have a situation like yours, I did have something similar where my car wanted to leap forward with my foot on the brake in stop and go traffic. I thought for sure I was going to nail the car in front of me. Then right after the car was in a false neutral mode where when I hit the gas to move with traffic, the car just sat there.

If you read my thread above, I've tried everything. And I think I'm the only one that has. PPK, SIB update, and Dinan S2 tune. I strongly feel what the tech did which I have posted in my thread was the actual fix for the problem. It's been over a year since the fix was put in place and the car drives near perfect.
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      05-30-2018, 09:41 AM   #9
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Quote:
Originally Posted by bagekko View Post
Yeah that's the last thing I sent to my SA and he wants me to take the tech for drive before they do the procedure. That was almost 2 months ago and just been too busy. Thanks for posting the thread link as I was going to have to find it again as I started a new job and lost all my bookmarks.

I really need to get it fixed as I might be trading in the 135 if the right thing comes along. My sales guy knows I have a funky DCT and they took a bath on a Z4 with DCT issues that they could not resolve, of course your solution detail probably would of fixed it.

What baffles me is that everyone at dealers I frequent dont seem aware of DCT gremlins. Its still better than SMG! Perhaps this is why BMW chose slush sport auto for the new M5. Can I swap in a Porsche PDK cause theirs seems to be best.
I wonder if the M3 peeps are having the same issue. I haven't jumped over to that sub forum to see if they are also complaining about these driveability issues. The DCT in our cars are the exact same ones used in the M3 with the exception of having different software.

I also had the pleasure of beating on some M3/M4s recently which have DCTs in them. The operation of the new DCTs are very different than the ones in our cars. There's a different way you have to put the car in park. I don't remember exactly the steps right now. Also to put the car into manual shifting mode, you push the shifter to the right instead of the left. Also, you can adjust how aggressive the transmission shifts between gears but that feature may have been in the DCTs for the Ms that are the same as ours.

But overall, the DCTs in the new M cars are very good. No discernible lag. Shifts are clean and precise.
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      05-30-2018, 12:39 PM   #10
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happened to me ..xcept, my car at a intersection stalled and when it woke shot out like a bat outta hell!! fuckin dangerous..
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      05-30-2018, 12:45 PM   #11
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Remember, whenever you take it in, make sure the AC is on MAX. Though as hot as things are getting, you may be there already!
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      05-30-2018, 12:50 PM   #12
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This exact thing occasionally happens to me too. But I've noticed that it only occurs when the A/C is on. I've brought my car into BMW to have the updates and software installed but it still occasionally occurs.
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      05-30-2018, 01:26 PM   #13
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BMW needs to get their shit together before someone gets seriously hurt because of these DCT issues. What's it gonna take, a fatality?

As I've said before, my DCT has always worked flawlessly and there is no good reason or excuse for all of them not to perform the same way.
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      05-30-2018, 01:26 PM   #14
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I had DCT issues as well, they were basically completely resolved by going MHD stage 1.
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      06-01-2018, 08:43 AM   #15
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Called my local dealer.

They want $320 to reprogram the DME. Claim it takes two hours and the only way to know if the car has the newest software is to just reprogram it with the newest software.

That sounds like a huge load of BS to me.
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      06-03-2018, 09:53 AM   #16
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That is BS.

Look for an indy that can update the DME.

As far as I have seen, when someone hook it up, it tells them what is outdated and what is not.
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      06-03-2018, 09:54 AM   #17
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All of my DCT issues were fixed by a software update done a couple of years ago. Absolutely no problems since then.

BTW, my A/C is always on, and I never use the manual or sport mode!
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      06-03-2018, 07:54 PM   #18
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From what I have researched 2 years ago when I had the same problems, having AC on does seem to make the issues more pronounced. Also had slight jump in revs when at a stop or standstill, which didn't concern me as much as the acceleration lag.

Solution: Either get the new SIB software update OR get some sort of flash tune. For me the PPK tune solved 95% of my problems, but I still get the occasional rev jump, though not nearly as often as before. Idk if that is b/c I have a BMS intake installed though.
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      06-04-2018, 09:16 AM   #19
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I should add that the software update wasn't a 15 minute thing. It took nearly 24 hours to update it! There was some difference in performance after it. The car ran smoother, but its lower end performance seemed less aggressive, best wording I can come up with. However, the overall performance was fine.
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      06-05-2018, 09:26 PM   #20
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I live south of Nashville but will try to help you reset the adaptations if you are anywhere within driving distance. I finally figured mine out and it drives like new now!


It truly fixed my DCT as far as I can tell.

-Sam

Last edited by SamelCamel; 06-06-2018 at 09:23 AM..
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      06-07-2018, 01:39 PM   #21
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Spoke to my indy guy, said he can reprogram and tell what software it is.

Hopefully I'll be able to get in next week so he can change the plugs, tensioner belt, and see if the car has the latest software.
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      06-07-2018, 06:34 PM   #22
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I love 3 pedals! That is seriously dangerous. Good luck.
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