2018 Cadillac CT6 Problems
- Complaints
- 9filed with NHTSA
- Median mileage
- 28,750miles, 2 complaints with mileage
- Recalls
- 0campaigns on record
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
- NHTSA crash rating
- —no overall rating published
- EPA fuel economy
- 25 mpgcombined, 2.0L 4-cyl RWD · 22 city / 30 hwy
Sources: NHTSA records for the 2018 Cadillac CT6 (complaints, recalls, investigations), EPA fuel economy. Report an error
NHTSA recorded 9 consumer complaints for the 2018 Cadillac CT6. The part named most often is engine, with 3 complaints (33% of the total), followed by transmission and drivetrain (3) and fuel system (2). 2 of the complaints include a mileage, and 100% of those were filed for vehicles with under 50,000 miles; the median is 28,750 miles. NHTSA lists 0 recall campaigns and 696 technical service bulletins for this model year. Engine complaints overlap with 67 technical service bulletins filed under the same part. Transmission and drivetrain complaints overlap with 92 technical service bulletins filed under the same part.
This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.
Which parts are reported most
Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.
- Engine3 33%
- Fuel system2 22%
- Steering2 22%
- Brakes1 11%
- Exterior lighting1 11%
- Lane departure1 11%
- Body and structure1 11%
- Suspension1 11%
Example complaints
Engine: “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. …”
NHTSA complaint #11389316, filed 2021-01, 22,000 milesTransmission and drivetrain: “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.”
NHTSA complaint #11755395, filed 2026-08Fuel 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.”
NHTSA complaint #11755393, filed 2026-08Steering: “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.”
NHTSA complaint #11398939, filed 2021-03, 35,500 milesMileage when problems were reported
100% of the 2 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 22,000 and 35,500 miles.
Complaints by year filed
Fewer than 15 complaints, too few for a reliable trend.
Fuel economy and running cost
EPA ratings for each 2018 Cadillac CT6 version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving); plug-in hybrid figures are for gasoline-only (hybrid mode) driving, so no annual cost is shown.
| Version | Engine | Transmission | City | Hwy | Comb. | Fuel / yr |
|---|---|---|---|---|---|---|
| CT6 RWD | 2.0L 4-cyl | 8-speed automatic | 22 | 30 | 25 | $3,300 |
| CT6 AWD | 3.0L 6-cyl | 8-speed automatic | 18 | 26 | 21 | $3,900 |
| CT6 AWD | 3.6L 6-cyl | 8-speed automatic | 18 | 27 | 21 | $3,200 |
| CT6 Plug-In RWD | 2.0L 4-cyl · plug-in hybrid | CVT | 23 | 29 | 25 gas only | — |
Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.
Recalls and investigations
NHTSA lists no recall campaigns for the 2018 Cadillac CT6 in the data used here. A recall can apply to some vehicles of a model year and not others, so check a specific vehicle by VIN at nhtsa.gov/recalls.
Technical service bulletins
TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 696 on record; the latest 10 are shown.
- 11037555Sep 26, 2026Other or unknown. This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- 11037550Sep 21, 2026Other or unknown. This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering
- 11037253Sep 4, 2026Other or unknown. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- 11035340Jul 21, 2026Other or unknown. PI to help diagnose A/C concern
- 11030974Apr 1, 2026Other or unknown. This preliminary information communicates information about how to determine if a wheel and tires size change is available.
- 11030092Mar 9, 2026Other or unknown. This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.
- 11030091Mar 9, 2026Other or unknown. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- 11027689Jan 12, 2026Other or unknown. This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering
- 11027601Jan 8, 2026Other or unknown. This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- 11025755Nov 20, 2025Other or unknown. This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit…
Other model years of the Cadillac CT6
| Year | Complaints | Median mi | Recalls | Crash ★ | MPG | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|---|
| 2020 | 11 | 12,100 | 2 | — | 21 | — | Not enough data |
| 2019 | 17 | 58,000 | 4 | — | 28 | — | Rising |
| 2018 | 9 | 28,750 | 0 | — | 25 | — | Not enough data |
| 2017 | 17 | 10,000 | 1 | — | 25 | — | Stable |
| 2016 | 11 | 16,500 | 3 | — | 25 | — | Not enough data |
Frequently asked questions
How many NHTSA complaints does the 2018 Cadillac CT6 have?
NHTSA recorded 9 consumer complaints for the 2018 Cadillac CT6 as of Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 2018 Cadillac CT6 is reported most often?
Engine is named most often, in 3 complaints (33% of the total), followed by transmission and drivetrain with 3.
Has the 2018 Cadillac CT6 been recalled?
NHTSA lists no recall campaigns for this model year in the data used here. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
What gas mileage does the 2018 Cadillac CT6 get?
The EPA rates the 2018 Cadillac CT6 (CT6, 2.0L 4-cyl) at 25 mpg combined, 22 city and 30 highway, with an estimated annual fuel cost of $3,300 at 15,000 miles a year. Other engine and drive versions are rated differently.
At what mileage are problems with the 2018 Cadillac CT6 reported?
Among the 2 complaints that include a mileage, the median is 28,750 miles and the middle half falls between 22,000 and 35,500 miles; 100% were filed for vehicles with under 50,000 miles.
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).
Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.