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      04-01-2019, 12:03 PM   #53
dtla1
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Drives: 2011 135i, Space Grey
Join Date: Apr 2014
Location: Silicon Valley

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I've had it buck/surge on me before, but it also would throw a red transmission overheating light at the same time. From what I understand it's the clutch slipping and not being able to figure out what gear to go into. This happens mostly when slowing down since the car is essentially on the clutch, but also at the ready to switch into the next gear. In a DCT, while slowing the car should theoretically be ready to engage the next gear down, but sometimes it slips and instead shifts up. It's quite weird indeed.

This is what I was experiencing and ultimately had my clutch replaced to fix it.
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