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      08-19-2018, 05:31 PM   #1
60HawkDriver83
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Launch Control Failure?

Has anyone ever experienced a launch control failure? I decided to try my LC for the first time ever today (2018 M2 w/ 4000 miles); the car was warmed up properly with some spirited driving for about 50 miles before the attempt. I came to a full stop, turned off the DSC and put left on the brake and held it, race flag appeared, accelerator to the floor and RPMs held at 3000. When I released the brake, the car basically lurched a little and almost completely stalled before I let off the accelerator. I was afraid I broke something but got no warnings on the dash at all and the car drove fine after. After letting the car cool down for a few miles I tried a standing launch from a crawl in automatic mode and Sport +; the car accelerated but the car reached the rev limiter in 2nd gear and didn’t shift into 3rd on its own, I shifted after the RPMs bounced of the limited for a second or two. :-/

Any ideas what would cause this? Is this something I should ask my service advisor about at the dealership?

B Lucas
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      09-02-2018, 11:04 PM   #2
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Did you lift throttle at all after you let off the brake?

I don't have DCT but from what I understand it's very picky about that.
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      09-28-2018, 09:11 AM   #3
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Quote:
Originally Posted by ZPrime View Post
Did you lift throttle at all after you let off the brake?

I don't have DCT but from what I understand it's very picky about that.
You are correct, if you lift off throttle at all during launch control, DCT will default to manual mode and you will be forced to upshift yourself. NOT lifting off throttle during launch control (manual shift mode), DCT will upshift like it's in Auto mode all the way to top speed in 7th.
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      10-12-2018, 05:02 PM   #4
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I didn’t lift off the throttle at all... It happened again today, the first time I’ve tried launch control since the last time it failed. I launched properly, the car shifts into 2nd, then I felt a clunk from the transmission and the car cut all throttle power as if I took my foot completely off the gas, but I still had wide open throttle. I immediately let off at this point and let the car coast for a few more feet before stopping. Still no warning lights, no limp mode notifications, nothing. Car drove fine back home after, but I’m concerned at this point...
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      10-15-2018, 02:17 AM   #5
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Yeah, that doesn't sound right. I'd take it to a dealer and see if you can get a tech to ride with you while you reproduce.
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      02-20-2020, 03:56 AM   #6
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Quote:
Originally Posted by 60HawkDriver83 View Post
Has anyone ever experienced a launch control failure? I decided to try my LC for the first time ever today (2018 M2 w/ 4000 miles); the car was warmed up properly with some spirited driving for about 50 miles before the attempt. I came to a full stop, turned off the DSC and put left on the brake and held it, race flag appeared, accelerator to the floor and RPMs held at 3000. When I released the brake, the car basically lurched a little and almost completely stalled before I let off the accelerator. I was afraid I broke something but got no warnings on the dash at all and the car drove fine after. After letting the car cool down for a few miles I tried a standing launch from a crawl in automatic mode and Sport +; the car accelerated but the car reached the rev limiter in 2nd gear and didn’t shift into 3rd on its own, I shifted after the RPMs bounced of the limited for a second or two. :-/

Any ideas what would cause this? Is this something I should ask my service advisor about at the dealership?

B Lucas
2018 MG M2
Dinan STG 1, Fabspeed DP, Wagner EVO Comp II IC
I've recently purchased an M2 (2017 LCI, DCT) and I've had the same issue. Did you find a fix for this 60HawkDriver83? Any help would be greatly appreciated!
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      07-31-2020, 03:14 PM   #7
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I've also experienced this, seems like LCI m2s have this issue, something to do with traction?
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