2016 Cadillac CT6 transmission problems: shifting rough

Shifting Rough

2016 Cadillac CT6

This problem may be covered under warranty. Ask your Cadillac dealer.


pretty bad
Typical Repair Cost:
No data
Average Mileage:
18,300 miles
Total Complaints:
2 complaints

Most Common Solutions:

  1. not sure (2 reports)
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2016 Cadillac CT6 transmission problems

transmission problem

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2016 Cadillac CT6 Owner Comments

problem #2

Jul 172019

CT6 Platinum 3.0L Tt

  • Automatic transmission
  • 20,580 miles


Recently purchased 2016 Cadillac Platinum CT6 with 3.0 TT engine and approximately 19,135 miles. Under mild acceleration, the transmission searches, "hunts" for a gear. There is a noticeable hesitation and then short but sudden burst of acceleration. There also seemed to be an odor from something that was hot or burning. The dealer had just recently replaced the gas tank. So, I don't know if the odor was related to that repair or the transmission issue. Regardless, there also was a mild vibration similar to driving over rumble strips that are often on a roadway that is approaching a stop sign.

I texted the service writer at the dealership. He indicated that model and year of Cadillac was known to have a "busy" transmission. However, he assured me it was operating as designed. I'm not so sure about that. We owned a 2016 Camaro with 6.2 liter engine that also had an 8-speed transmission. Granted, we bought it new and didn't drive it much. But that transmission operated flawlessly during the two years we owned the vehicle.

So, am trying to figure out a path forward as to how to get the issue resolved. The vehicle is a CPO auto with a manufacturer's warranty. However if GM's line is "there is nothing wrong", perhaps a third party upgraded transmission (or torque converter) would be a better move. But then there is the integration of software with the remaining OEM equipment (turbos, fuel management, etc.) that could be problematic. Then I would have GM and the third party provider pointing fingers at each other. Result would be - still no resolution of the problem.

- phitter, Twin Lake, US

problem #1

Nov 122018

CT6 Premium Luxury 3.0tt V6

  • Automatic transmission
  • 16,000 miles

Since I have owned the car the transmission from time to time will let off a very rough shift. Usually, happens when slowing down to a stop, but speeding up before you stop. The transmission is have a very ruff downshift. Then it started a new problem of slam into gear the first thing in the morning. Car was at dealer for three weeks to replace transmission. The problem with the slam into gear in the morning is gone, but still getting ruff shifts. Was on an uphill while slowing down and then speeding up. It felt like I was rear ended.

- Ray A., Lynnwood, US

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