2018 Cadillac Ct6 problems, complaints & recalls
Most-reported problem areas: Power Train (3) · Suspension (1) · Steering (1)
🧭 Reliability snapshot
Compared against other Cadillac Ct6 model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (696)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-09-26 · PIT5698F · Service Bulletin/Repair Instructions
this pi provides diagnostics tips on how the lin bus works and how to diagnosis it.
Unknown Or Other 2026-09-21 · PIP5700H · Service Bulletin/Repair Instructions
this pi communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering
Unknown Or Other 2026-09-04 · PIP4902W · Service Bulletin/Repair Instructions
this preliminary information advises a dealer on how to email gds2 session logs into technical assistance.
Unknown Or Other 2026-07-21 · PIT5099J · Service Bulletin/Repair Instructions
pi to help diagnose a/c concern
Unknown Or Other 2026-04-01 · PIT3271Q · Service Bulletin/Repair Instructions
this preliminary information communicates information about how to determine if a wheel and tires size change is available.
Unknown Or Other 2026-03-09 · PIP6104 · Service Bulletin/Repair Instructions
this preliminary information communicates the steps on how to save a gds2 session log and upload to a technical assistance case in cx connect.
Showing the 6 most recent of 696 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-08-07 · 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 (differenti…”
2026-08-07 · 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 cause…”
2026-06-23 · 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. …”
2025-12-26 · 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…”
2024-02-15 · Suspension“yes my car was sold to me with structural damages, and i was told any of this when i purchased it!!!!…”
2023-02-21 · Service Brakes“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. …”
2023-02-21 · 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…”
2021-03-03 · Steering · 35,500 mi“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 …”
2021-01-21 · Power Train · 22,000 mi“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 cadil…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.