Showing the 2018 CT6 Luxury. We haven't verified this trim's engine; the numbers below cover every version of this model year. Every version
Owner complaints, recalls, fuel economy and safety ratings from public NHTSA and EPA data, updated Oct 17, 2026.
Fuel economy
21–25 mpgcombined; city 18–23, highway 26–30; every version of this model year; plug-in hybrid versions on gasoline, 62 MPGe on electricity
Five years of fuel
$15,470–$19,160U.S. average; Ohio $13,820–$18,060 at local prices; every version of this model year; fuel only, not other costs of owning it; 15,000 miles a year, at EIA fuel prices for the week of Oct 12, 2026. Plug-in hybrid versions: $16,500, EPA's own estimate for plug-in hybrids: its national gasoline and electricity prices and the share of miles it expects on electricity; not priced for any state
NHTSA overall safety rating
Not ratedNHTSA has no overall rating for this year
NHTSA's VIN data lists these trims for the 2018 CT6. A trim's engine and numbers are shown as its own only where EPA names versions after the trim and no other version could be it; "seen with" means a source shows that engine on the trim, not that it was the only one. Recalls and complaints cover the whole model year: whether a recall applies to a car depends on its VIN, on NHTSA's recall lookup.
Owners have filed 12 complaints with NHTSA about the 2018 CT6. These are unverified owner reports, counted by the part of the car they name; one complaint can name several parts. Counts aren't adjusted for how many were sold, so they don't show how reliable a car is.
Complaints by part of the car
Part
Complaints
Crashes
Fires
Injuries
Engine
4
0
0
0
Power train
4
0
0
0
Steering
3
0
0
0
Fuel/propulsion system
2
0
0
0
Electrical system
1
0
0
0
Electronic stability control (ESC)
1
0
0
0
Exterior lighting
1
0
0
0
Forward collision avoidance
1
0
0
0
Lane departure
1
0
0
0
Service brakes
1
0
0
0
Structure
1
0
0
0
Suspension
1
0
0
0
Complaints by model year
Newer years have had less time to collect complaints, and counts aren't adjusted for sales, so a shorter bar doesn't mean a more reliable year.
NHTSA lists 2 recall campaigns for the 2018 CT6 over its history. Campaigns are matched by model and year, so each one may apply to a given car, and its repair may already be done: check a VIN on NHTSA's recall lookup for the open recalls on that exact car.
General Motors LLC (GM) is recalling certain 2018-2019 Cadillac CT6, Escalade ESV, Chevrolet Suburban, Volt, and GMC Yukon XL vehicles. Certain second-row or third-row rear seatbelts retractor assemblies may not automatically lock when the seatbelt is fully pulled out of the retractor, possibly preventing a child seat from being properly secured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
Risk: If the child seat is not properly secured in the event of a crash, it can increase the risk of injury.
Remedy: GM will notify owners, and dealers will inspect the rear seatbelt retractors and replace them if necessary, free of charge. The recall began November 7, 2018. Owners may contact Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is 18315.
General Motors LLC (GM) is recalling certain 2016-2018 Cadillac CT6 vehicles. The inboard child seat anchorage bars may have had excess structural adhesive applied during assembly, which can interfere with the installation of a child seat. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 225, "Child Restraint Anchorage Systems."
Risk: If the child seat cannot be attached correctly to the anchorage bar, there is an increased the risk of injury.
Remedy: GM will notify owners, and dealers will inspect, remove any excess adhesive, and apply anti-corrosion primer to the inboard child seat anchorage bars, free of charge. The recall began August 3, 2018. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is 18228.
Carmakers sent NHTSA 1,096 service bulletins and notices that cover the 2018 CT6, the latest on Sep 26, 2026. They tell dealers how to fix known issues.
The parts they mention most: equipment (379), electrical system (236), engine and engine cooling (145), power train (126), engine (111).
NHTSA hasn't opened a defect investigation that covers this model year.
Maintenance
Oil
The owner's manual gives the oil and how often to change it. We show oil facts only once we've checked them against the manual, and we haven't yet for the 2018 CT6.
EPA class: large cars. EPA greenhouse gas score: 4–10 out of 10. Each version EPA tested:
Swipe the table sideways for more columns.
Version
Engine
Transmission
Fuel
City / hwy / comb
CT6 Rear-Wheel Drive
2.0 L, 4 cyl, turbo
Automatic (S8)
Premium Gasoline
22 / 30 / 25
CT6 All-Wheel Drive
3.0 L, 6 cyl, turbo
Automatic (S8)
Premium Gasoline
18 / 26 / 21
CT6 All-Wheel Drive
3.6 L, 6 cyl
Automatic (S8)
Regular Gasoline
18 / 27 / 21
CT6 Plug-In Rear-Wheel Drive
2.0 L, 4 cyl, turbo
Automatic (variable gear ratios)
Premium Gasoline or Electricity 31 miles on electricity, 430 miles in all
23 / 29 / 25 on gasoline 62 MPGe on electricity
Sources and dates
U.S. EPA fuel economy data, file of Sep 29, 2026
NHTSA owner complaints, file of Oct 17, 2026
NHTSA recalls, file of Oct 17, 2026
NHTSA manufacturer communications, file of Oct 17, 2026
NHTSA defect investigations, file of Oct 17, 2026
NHTSA 5-Star Safety Ratings, file of Aug 7, 2026
U.S. Energy Information Administration, file of Oct 12, 2026
Fuel cost: EPA mpg with fuel prices for the week of Oct 12, 2026 and electricity prices for Jul 2026. Source: U.S. Energy Information Administration (Oct 2026). Complaints are unverified reports owners filed with NHTSA. About the data