My 2015 8sp is shuttering bad. It started around 7k and I have 11k on it now. Gets worse every time I drive it. Took it to the dealer three times. Once for TCM Update, twice since the shuttering. It will do it at any speed, any gear under constant throttle or light acceleration. GM of course has give me the runaround. The first tech said it needed a torque converter but they were waiting on an improved version to come out in about a month. Right when the month was about up the service manager called me and said there wasn't a fix and he didn't know why the tech put it on the receipt. I told the service manager to schedule me an appointment for the following Friday so I could show him what my truck is doing. He wasn't there when I took it in. The tech that checked it again said it needed a torque converter. He ordered it and may come with a new trans. Part was supposed to be here around 7 days from 11-20-15. Still waiting.
My major concern is, if this thing has been shuttering this long there is probably some wear on something. My hopes is that they do the whole trans.
When it shutters, it's so bad the steering wheel is bouncing up and down. Feels like I got some 12s in the back.
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