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The 2016 Cadillac CT6 rolled out with an 8-speed automatic transmission as standard. However, there's a well-known problem with this transmission causing shaking and shuddering, especially when accelerating on the highway. It can be quite bothersome, but there's no need to panic about your transmission failing or requiring significant repairs. No recall has been issued for this issue. If your transmission is having trouble shifting, it might be due to low transmission fluid levels. To check, use the dipstick to see if it needs a refill.
Some issues that have been reported with the 2016 Cadillac CT6 transmission include rough gear changes and vibrations or shaking during transmission operation.
I encountered a similar issue with my 2016 Cadillac CT6. I ended up needing to replace the valve body and repair the converter.
We had no solution at hand.