2017 Cadillac CT6 Owner Complaints

UNKNOWN, The transmission slips,it wont drive now and my wheel barrings nearly snapped

NHTSA ID

11738945

Incident

May 14, 2026

The vehicle experiences harsh shifting, surging, and jerking forward during normal driving conditions. The behavior has occurred repeatedly over several years and has been confirmed by the dealership. Multiple repair attempts, including transmission-related work, have not resolved the issue. The vehicle has surged forward unexpectedly, creating near-miss accident situations. I no longer feel the vehicle is safe to operate.

NHTSA ID

11714281

Incident

Jun 15, 2018

My CT6 had a default engine light on,.Dealer reports broken EVAP line.Car has never been in an accident or damaged.Upon inquiry dealer reports no issues known to them with this problem.However ,this same vehicle had transmission issue when purchased new and the dealer stated same findings.Then recall was issued and transmission was repaired for a known problem and repaired under a recall notice.My concern is this may be similar situation with the fuel EVAP system.The vehicle is my primary car and a fuel vapor leak is a grave concern to me and I believe posses a risk, especially as the replacement parts are unavailable at this time.I have filed an inquiry with Cadillac/Gm #82543696 Steven Maffei(AI inquiry reveals known and past problems with Cadillac EVAP systems)

NHTSA ID

11700820

Incident

Oct 7, 2025

My vehicles transmission has a buzzing noise coming from the transmission oil pan and a gear shifting problem I took vehicle to Cadillac dealer whom can’t find the issue they changed the oil pan and the transmission lines . My vehicle is a 2017 Cadillac ct6 with 72027 miles . I’ve been to 4 Cadillac certified dealers and none can locate to problem . Thank you . Also I would like to add that Cadillac open road In New Jersey has taken off my splash guards and would not return them . I have a video of the manager claiming the car doesn’t come with guards and another stating the job he did not require him to remove splash guard but that is not true .

NHTSA ID

11655564

Incident

Apr 2, 2025

Water is getting into my trunk where the amp is and now my radio does not work only the back up camera. I cannot control the AC or turn on the air conditioner. Or is that how I would like it to blow

NHTSA ID

11649426

Incident

Feb 12, 2025

These vehicles have an issue tbat GM is aware of, with their 8 speed automatic transmissions which are used in multiple GM vehicles and these cause safety issues because for instance my vehicle switches gears randomly almost causing a wreck, and shuttering, and even slipping and when this happens the cars traction control light is engaged shutting it off, active steering is also shut off due to these on going issues. Im in a cadillac group and hundreds of us have similar issues.

NHTSA ID

11626548

Incident

Oct 15, 2024

Transmission - Jerks and studders (hesitation) in the course of normal driving. Brakes - Makes a squealing noise which has gotten louder over time.

NHTSA ID

11595865

Incident

Sep 29, 2023

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 ID

11532575

Incident

Jul 11, 2023

SIDEWALL CRACKING ISSUE WITH ALL FOR TIRES - PIRELLI P ZERO NERO 245/40/R20 While traveling out of town (Dallas to San Antonio) we experienced some tire issues which led to us needing to replace all 4 tires. Several weeks prior, we began to noticed a very slight loss of tire pressure and had the tires checked twice for any objects or other damage – Nothing found. We also had the tires rotated to trouble shoot and rule out any issues with sensors – none. Both times, the service shops did not mention or recognize any tire damage or issues. During our 5 hour drive to San Antonio, we started to see tire pressure issues again along with a noticeable sound from the tires. With this concern, we took vehicle to Firestone for diagnosis and to our surprise they found severe damage and cracks to the side walls of the tires. Firestone confirmed the tire damage was not safe to drive on and due to the location of the damages, we would need to replace all 4 tires. We were shocked to see such severe cracking damage and were at a loss for how this could occur. The tires were in very good condition and still had significant tire tread with even wear. After some research we discovered that this type of side wall tire cracking has been know to happen and even Pirelli has recalled tires for this issue. We did not see a specific recall to this size tire but did find that Pirelli had another recall on tires made in 2016 saying "THE PROBLEM WAS CAUSED BY A PRODUCTION ERROR (INCORRECT CARCASS COMPONENT), AND THE TIRES MAY SHOW SURFACE CRACKING IN THE LOWER SIDEWALL OF THE TIRE...". Please review this claim and confirm receipt. We are hoping to get some kind of reimbursement for the damages that we believe are a result of faulty or defective tires - this is what the Firestone technician also stated on video recording (I can provide video if needed). Thanks in advance for your consideration [XXX] INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

NHTSA ID

11530777

Incident

Jul 1, 2023

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 ID

11488586

Incident

Sep 9, 2022

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 ID

11488585

Incident

Oct 5, 2022

The contact owns a 2017 Cadillac CT6. The contact stated that while driving at various speeds, the vehicle would hesitate upon depression of the accelerator pedal without warning. The contact had taken the vehicle to a dealer where they initially changed the transmission fluid and reprogrammed the transmission module; however, the failure persisted. The contact returned the vehicle to the dealer and she was informed that the torque converter was defective; but that the cost to replace the transmission was expensive. She was advised to bring the vehicle back to dealer each time the hesitation occurred to have the transmission fluid replaced. The manufacturer had yet to be notified of the failure. The vehicle had yet to be repaired. The failure mileage was approximately 14,000.

NHTSA ID

11458017

Incident

Jan 1, 2021

Mileage

14,000 mi

Steering rack bound up and became extremely difficult to move, causing vehicle to leave roadway. Power assist failed and manual mode would not allow steering to left making it nearly impossible to control direction of vehicle.

NHTSA ID

11422881

Incident

Jun 29, 2021

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. THESE CONDITIONS ARE MOST COMMONLY OBSERVED UNDER LIGHT AND MEDIUM THROTTLE APPLICATIONS, AND AS OFTEN DURING FULL THROTTLE APPLICATIONS. I HAVE HAD THE TSB 18-NA-335 DONE AND ISSUES STILL REMAIINS.

NHTSA ID

11405442

Incident

Mar 10, 2020

Mileage

500 mi

WHEN YOU PT IN THE REVERVE THE OUT SIDE MIRRORS DID NOT TILTED , AND SOME TIME THE PARKING BREAK LIGHT ON

NHTSA ID

11396532

Incident

Feb 4, 2021

TL* THE CONTACT OWNS A 2017 CADILLAC CT6. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 67 MPH, THE SUN ROOF EXPLODED WITHOUT IMPACT. THE VEHICLE WAS TAKEN TO HILL CADILLAC LOCATED AT 3964 WEST CHESTER PIKE, NEWTOWN SQUARE, PA 19073, WHERE THE TECHNICIAN TOOK PICTURES TO SEND TO THE MANUFACTURER. THE CONTACT WAS INFORMED THAT THE WARRANTY HAD EXPIRED. THE CONTACT WAS NOT GIVEN A CALLBACK. THE MANUFACTURER WAS CONTACTED AND THE CONTACT WAS TRANSFERRED TO A NON-WORKING NUMBER. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 114,000.

NHTSA ID

11339080

Incident

Jul 11, 2020

Mileage

114,000 mi

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. *TR

NHTSA ID

11328598

Incident

Jun 3, 2020

Mileage

6,000 mi