YearToAvoid

2018 Cadillac CT6 Problems, Recalls & Reliability

Verdict

Best

Complaint Index

0/100

#5 most-complained of 5 CT6 years

The 2018 Cadillac CT6 has 9 owner complaints and 0 safety recalls on file with NHTSA. Its Complaint Index is 0 out of 100 — #5 highest of 5 CT6 model years (verdict: Best). The most reported problem area is engine (3 complaints, 33% of the total).

Complaints
9
Recalls
0
Crashes / fires
0 / 0
Injuries / deaths
0 / 0
NHTSA overall rating
Not rated
EPA combined MPG
23
20 city / 28 hwy

Top 2018 Cadillac CT6 problems

NHTSA owner complaints by component group. Groups with 15+ complaints have their own page.

  1. Engine3 (33%)
  2. Transmission & Powertrain3 (33%)
  3. Fuel System2 (22%)
  4. Steering2 (22%)
  5. Brakes1 (11%)
  6. Electrical System1 (11%)
  7. Collision Avoidance & Cameras1 (11%)
  8. Lane Departure1 (11%)
  9. Structure & Body1 (11%)
  10. Suspension, Wheels & Tires1 (11%)
2018 Cadillac CT6 complaints: complaints filed per month3Jan 2021Mar 2021Feb 2023Feb 2024Dec 2025Jun 2026Aug 2026
16 complaints filed with NHTSA from Jan 2021 to Aug 2026; peak Jan 2021 (3).

2018 Cadillac CT6 recalls

No safety recalls on record for this model year.

2018 Cadillac CT6 fuel economy and fuel cost

City
20 MPG
Highway
28 MPG
Combined
23 MPG
Annual fuel cost (EPA)
$3,200
15,000 mi/yr
Fuel
Premium
Current regular gas
$4.32/gal
national avg.

EPA figures; median across configurations of this model year. Estimate your own cost with the fuel cost calculator.

2018 compared with other CT6 years

Complaint Index by model year (0 = fewest issues, 100 = most)025507510020162017201820192020
Complaint Index: 0 = fewest issues, 100 = most, relative to other years of this model. Avoid Caution Good Best
YearVerdictIndexComplaintsRecallsMPG
2016Avoid10011321
2017Good2517123
2018Best09023
2019Avoid7517421
2020Caution5011219

All Cadillac CT6 years: best and worst →

Frequently asked questions

Is the 2018 Cadillac CT6 a reliable year?
Judged by NHTSA owner complaints and recalls, the 2018 Cadillac CT6 ranks #5 of 5 among CT6 model years (Complaint Index 0/100, verdict: Best). It has 9 complaints and 0 recalls on file. This reflects reported safety-related problems, not an overall reliability rating.
What are the most common problems with the 2018 Cadillac CT6?
The most reported problem areas are engine (3 complaints), transmission & powertrain (3 complaints), and fuel system (2 complaints). The median mileage at the time of failure in complaints that report it is 28,750 miles.
Does the 2018 Cadillac CT6 have any recalls?
No safety recall campaigns list the 2018 Cadillac CT6 in NHTSA’s recall database at the time of the last data update.
What is the fuel economy of the 2018 Cadillac CT6?
EPA rates the 2018 Cadillac CT6 at 23 MPG combined (20 city / 28 highway), with an estimated annual fuel cost of $3,200. Where several configurations exist, the median is shown.

Sources: NHTSA Office of Defects Investigation complaint and recall databases; U.S. EPA fuel economy data; NHTSA 5-Star Safety Ratings. Complaints are unverified owner reports.

Data updated Sep 24, 2026. Read the methodology and data sources. The Complaint Index is based on NHTSA owner complaints and recalls; it is not a reliability rating.