2018 Cadillac CT6 problems

Filed Aug 7, 2026 · Transmission · TX

When vehicle was purchased new there was a slight bearing wear noise at the front driver side, which grew louder with years. Noise synchronized with tire rolling rpm. Replacing (my self) front trans axle, the brake pads, shaving rotors, & wheel hub bearing did not fix noise. Next; Dealer shop reported that the AWD front transfer case (differential) had a bad bearing AND that this was a common problem with the model car. $1600 repair bill.

Filed Aug 7, 2026 · Fuel system · TX

During refueling the gas station pumping nozzle would shut off indicating a full gasoline fuel tank; but, the dash board fuel gage indicated the fuel was not full. Had to dribble in fuel to fill. Dealer Mechanic found: Crash roll over gasoline vent safety valve was stuck in the crashed roll over cut off state. No gas tank ventilation. This caused back pressure in car gasoline tank to shut off gas station filler nozzle as though the car was full . Entire gas tank had to be replaced. Still under warranty.

Filed Jun 23, 2026 · Engine · IL

Stuck Thermostat. Vehicle not achieving operating temperature in the correct time. ALL 3 of the people I know with CT-6's had the exact same issue this year.

Filed Dec 26, 2025 · Transmission · PA

Front differential case ripped in half and separated from the ring gear. The broken chunk of differential case and pinion was still attached to the driveshaft while coming to an abrupt stop. Damage done within driveshaft tunnel. No warning, no vibration, no cause for concern, just catastrophic failure. Differential and propeller shaft were replaced by an independent mechanic. Cadillac has not been notified as of today, receipt for repair available upon request.

Filed Feb 15, 2024 · Body, Steering · OH

Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!

Filed Feb 21, 2023 · Lights · NJ

My driver front head light is partly not working. I beleive it is an LED light and the fact that it no longer works is not what I expected from LED, it should last much much longer than 5 years; after all it is a cadillac and it shouldn't have happened. I requested cadillac corporate to assist me with this and all they would do for me is give me a $250.00 credit towards the repair that is aprox. $1,800.00 this head light is defective and they should do good by me, this is my 5th. Car with them. Thank you for your help [xxx] information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).

Filed Feb 21, 2023 · Brakes, Engine · MD

The brake makes a rattling and metal grinding sound, the dealership said nothing is wrong with the brakes, still problematic. The transmission shifts too hard. Dealer said nothing wrong. Yet cat kicks too hard.

Filed Mar 3, 2021 · Driver assistance, Steering · 35,500 miles · TN

On mar 1, 2021 while driving super cruise mode, my car jerked violently to the left almost striking another car. I was on the fl turnpike about 20 miles north of orlando heading south. The highway was increasing from 2 lane to 3 lane southbound and I was in the right lane. When I entered the lane transition, the car drifted right . As the car came upon the new white line the car about centered it. The car turned hard left, and turned off super cruise. Fortunately, I was able to grab the steering wheel and correct the turn. We did not crash, but it was most unsettling.

Filed Jan 21, 2021 · Engine, Fuel system · 22,000 miles · GA

My cadillac ct6 (2018) quit working while on the expressway. I was in the middle of no where, in georgia. This made for a very dangerous situation as the car suddenly lost all power going to the wheels while driving at approx. 75 MPH. I was barely able to get around traffic to be able to pull over as there was 0 power. When the tow truck from cadillac arrived we were told we were not allowed to ride in the truck because of covid. We were made sit in the rain in 40 degree weather while I spoke with my home cadillac dealer as well as the nearest to where I was. Both dealers were extremely unhelpful, my car is still under factory warranty and was just in for transmission work about a week prior (I've taken the car in three times for transmission issues and it still has something wrong with it. I was told by both cadillac dealers that they would not help because they needed to 'diagnose' the car and couldn't until five days later. I was offered an uber ride in a city that had 0 zero uber, taxi or lift services. I was hung up on by these people, they were rude and this was on christmas eve. I had to walk to a car rental company and pay over $400 dollars so I could spend christmas with my family.