2017 Cadillac CT6 Transmission and drivetrain Problems
- Complaints
- 10about this part
- Share
- 59%of 17 total for the year
- Median mileage
- 6,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 10 complaints about the transmission and drivetrain of the 2017 Cadillac CT6, 59% of the 17 complaints for this model year. Where a mileage was given, the median is 6,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“My 2017 Cadillac CT6 3.0 tt premium luxury has had this issue since I purchased it. Dealership state that this is normal and I should live with it. If I knew this before I purchase this $98,000 vehicle I would have gone mercedes-benz. The issues with the 8-speed 8l90 GM transmission are two-fold. First, the transmission shudders frequently. Secondly, the shifts are very harsh between first to second, and then second down to first, especially when accelerating and the transmission is upshifting or decelerating and the transmission is downshifting. …”
NHTSA complaint #11405442, filed 2021-03, 500 miles“When auto stop is engage taking your foot off the brake pedal from a complete stop when the engine starts back up it has a harsh jerk sometimes, it feels as though someone has hit you from the rear. This been going on for three years the car has been in service twice for this problem the service technician cannot duplicate it.”
NHTSA complaint #11328598, filed 2020-06, 6,000 miles“The car is equipped with an 8-Speed Automatic Transmission which is frequently very hard shifting from 1st to 2nd gear. The car has been to my local Cadillac Dealer twice for this problem; they reply this is a know problem, and a normal condition, but the problem is getting worse. I'm concerned for the future and afraid of an accident because of a transmission failure.”
NHTSA complaint #11532575, filed 2023-07“I was driving the vehicle heading to the interstate, and my speed was about 15 MPH, as I merge onto the highway and accelerated I felt the transmission shudder, and lag with a humming noise. It felt like the transmission mission was slipping and shaking with no acceleration power. I had to keep hitting the gas pedal to try and make the transmission engage. Very Dangerous! The transmission would also throw you back and jerk when accelerating violently. The transmission lunges forward and jerks into gears when starting from 0 mph.”
NHTSA complaint #11488586, filed 2022-10“While driving the vehicle with auto stop engaged, the auto stop was malfunctioning. When I get to a red light or stop sign vehicle would engage auto stop, once I let my feet off the gas pedal and accelerate, the vehicle would jerk out of gear then slip /drag then engage with a loud hit as if someone rear-ended me. The problem was duplicated and confirmed by the dealership. There has been no outside inspection other than the dealership. No warning lights messages prior to failure. In addition, the Auto-stop working with a week of this complaint shortly therafter.”
NHTSA complaint #11488585, filed 2022-10Related service bulletins
- 11019516Apr 17, 2025This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
- 11014622Mar 2, 2025This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement
- 11014621Mar 2, 2025This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement
- 11014353Feb 12, 2025This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares.
- 11013069Jan 9, 2025This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- 11011989Nov 27, 2024This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.
- 11011205Oct 28, 2024This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules.
- 11011436Oct 10, 2024This Preliminary information communicates for Technicians installing a Service Replacement Transmission Assembly to contact Technical Assistance to make sure unit is not suspect…
- 11009756Sep 17, 2024This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and…
- 11009088Sep 16, 2024This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be…
Transmission and drivetrain: other model years
Other parts of the 2017 Cadillac CT6
4 complaintsBrakes
2 complaintsVehicle speed control
2 complaintsEngine
1 complaintsForward collision avoidance
1 complaintsFuel system
1 complaintsOther or unknown
1 complaintsSteering
1 complaintsBody and structure
1 complaintsSuspension
1 complaintsTires
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2017 Cadillac CT6
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology