Cadillac CT6 Complaints (2018)

12 consumer complaints on file.

#11755393August 7, 2026
FUEL/PROPULSION SYSTEM
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11755395August 7, 2026
POWER TRAIN
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745961June 23, 2026
ENGINE
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11707182December 26, 2025
POWER TRAIN
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11572148February 15, 2024
STRUCTURE:BODY, SUSPENSION, STEERING
Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11508253February 21, 2023
SERVICE BRAKES, ENGINE
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11508275February 21, 2023
EXTERIOR LIGHTING
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).
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11398939March 3, 2021
STEERING, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, LANE DEPARTURE: ASSIST
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11389316January 21, 2021
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
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.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11364614October 16, 2020
ELECTRONIC STABILITY CONTROL (ESC), ENGINE, STEERING
MY ENGINE LIGHT IS ON AND THIS IS THE 15TH TIME I HAVE BOUGHT MY CAR IN FOR VARIOUS ENGINE PROBLEMS LIKE ENGINE POWER REDUCED AND OTHER PROBLEMS WITH THIS CAR. THE CAR WOULD JUST STOP IN THE MIDDLE OF THE RIDE OR JERKING AS I DRIVE IT. I HAVE BEEN ON THE HIGHWAY WHEN IT HAS STALLED BEFORE AS I DRIVE. I HAVE HAD THESE PROBLEMS SINCE I PURCHASED THE CAR IN 2018
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11341298July 24, 2020
POWER TRAIN
LOSS OF ALL VEHICLE POWER WHILE TRAVELING ON THE FREEWAY AT HIGHWAY SPEEDS. VEHICLE CHECK ENGINE, POWER LIMITED, AND ELECTRIC MOTOR OVERHEAT WARNING LIGHTS COME ON. THE COMBUSTION ENGINE WILL NOT START, AND BATTERY POWER AVAILABILITY GOES TO ZERO. THIS IS VERY DANGEROUS TO PUBLIC HEALTH AND SAFETY DUE TO INSTANTANEOUS LOSS OF COMBUSTION ENGINE AND ELECTRIC BATTERY POWER WHILE IN FAST-MOVING HIGHWAY TRAFFIC. THERE ARE SEVERAL INSTANCES OF THIS SAME PROBLEM OCCURRING IN MANY CADILLAC OWNERS FORUMS, SO GENERAL MOTORS KNOWS THERE IS A PROBLEM WITH THEIR CT6 PHEV TRANSMISSIONS. THE FIX SEEMS TO BE REPLACING THE TRANSMISSION DUE TO A BAD CLUTCH PACK, BUT PEOPLE COULD GET HURT IF THIS ISSUE IS ALLOWED TO CONTINUE WITHOUT A PERMANENT SOLUTION.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11098735May 30, 2018
ELECTRICAL SYSTEM
RIGHT AFTER PURCHASE, THE NAV SCREEN KEPT FLICKERING, CAUSING A DISTRACTED DRIVER SITUATION AND A HAZARD. THE DEALER DID EVERYTHING THEY COULD PER GM GUIDELINES, BUT EVEN AFTER THE 1ST SERVICE VISIT, THE CAR WOULD SHUT DOWN IN DRIVE MODE, AS THE VEHICLE WAS IN MOTION. THEN THE VEHICLE WOULD NOT SHUT OFF USING THE POWER OFF BUTTON. GM IS TELLING THE DEALER, THE NAV FLICKERING SCREEN IS NOT A SAFETY HAZARD, HOWEVER I BEG TO DIFFER IF EVERY 2 MINS, A DRIVER IS FIXATED, FOCUSED ON THE SCREEN MORE SO THAN ON THE ROAD, WHICH HAS CAUSED ME TO RUN OFF THE ROAD A FEW TIMES. THIS IS A SERIOUS SAFETY HAZARD AND ELECTRICAL CONCERN THAT GM DOES NOT SEEM TO CARE ABOUT EVEN AFTER 60+ DAYS AT THE DEALERSHIP.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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