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Research · Large Cars

2018 Cadillac CT6Recalls, problems, MPG & safety

NHTSA lists 2 safety recalls and 12 owner complaints for the 2018 Cadillac CT6. Most complaints involve power train (4) and engine (4). The EPA rates it 21–25 mpg combined.

Check a VINAdd to my garage
Combined MPG
21–25mpg
EPA · 3 versions
NHTSA overall
—
Not rated by NCAP
Safety recalls
2campaigns
Latest Sep 2018
Owner complaints
12
Top: power train
Fuel cost / yr
$2,950est.
EPA estimate, best version
01 —Recalls

Safety recalls

2 NHTSA campaigns · applies to some vehicles, check your VIN

Seat belts: rear

Free remedy

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."

Seat beltsReported Sep 26, 2018NHTSA 18V673000

Seats: mid

Free remedy

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."

SeatsReported Jun 28, 2018NHTSA 18V437000
Data from NHTSA Recalls API · synced Nov 10, 2026 · All recall detailsNHTSA vehicle page
02 —Complaints

Owner complaints by component

12 complaints filed with NHTSA · May 2018 – Aug 2026
  1. Power train4
  2. Engine4
  3. Steering3
  4. Fuel/propulsion system2
  5. Suspension1
  6. Structure1
  7. Service brakes1
  8. Exterior lighting1
  9. Forward collision avoidance1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

By model year

Complaints for each CT6 model year we’ve synced.

View as table
Model yearNHTSA complaints
201611
201726
201812
201918
202011
Crashes reported
0
Fires reported
0
Injuries reported
0
Deaths reported
0
Data from NHTSA Complaints API · synced Nov 10, 2026 · Full problem breakdownNHTSA vehicle page
03 —Common problems

What owners report most

Verbatim excerpts from NHTSA complaints, by component

Power train

4 reports
“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.”
Owner complaint to NHTSAFiled Aug 7, 2026Power trainODI 11755395

Engine

4 reports
“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.”
Owner complaint to NHTSAFiled Feb 21, 2023Service brakes, EngineODI 11508253

Steering

3 reports
“Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!”
Owner complaint to NHTSAFiled Feb 15, 2024Steering, Suspension, StructureODI 11572148
All 2018 CT6 problemsSend a problem to a mechanic on findmechanic.ai
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026
04 —Key specs

Engines, transmissions & drive

3 versions rated by the EPA
EPA class
Large Cars
Engines
2.0L 4-cyl turbo · 3.0L 6-cyl turbo · 3.6L 6-cyl
Transmissions
Automatic (S8)
Drive
Rear-Wheel Drive · All-Wheel Drive
Fuel
Premium Gasoline · Regular Gasoline

Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.

Data from EPA fueleconomy.gov · synced Nov 10, 2026EPA listing
05 —Fuel economy

EPA fuel economy by version

City / highway / combined, annual fuel cost and CO₂
EPA
VersionCityHwyComb.Fuel / yrCO₂ g/mi
CT6
Auto (S8), 4 cyl, 2.0 L, Turbo · Rear-Wheel Drive
223025$3,100360
CT6 AWD
Auto (S8), 6 cyl, 3.0 L, Turbo · All-Wheel Drive
182621$3,700424
CT6 AWD
Auto (S8), 6 cyl, 3.6 L · All-Wheel Drive
182721$2,950416
  • CT6
    Auto (S8), 4 cyl, 2.0 L, Turbo
    22 city · 30 hwy · $3,100/yr
    25
    mpg comb.
  • CT6 AWD
    Auto (S8), 6 cyl, 3.0 L, Turbo
    18 city · 26 hwy · $3,700/yr
    21
    mpg comb.
  • CT6 AWD
    Auto (S8), 6 cyl, 3.6 L
    18 city · 27 hwy · $2,950/yr
    21
    mpg comb.
Estimate your fuel costCost of ownership
Data from EPA fueleconomy.gov · synced Nov 10, 2026 · Fuel cost is EPA’s annual estimate (15,000 mi, 55% city)
06 —Safety

NHTSA 5-Star Safety Ratings

2 tested variants
NHTSA has not published 5-Star Safety Ratings for the 2018 Cadillac CT6 as of Nov 10, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Nov 10, 2026Vehicle 12009Vehicle 12008
07 —Maintenance

Maintenance basics

General guidance, not the OEM schedule. Check your owner’s manual.
General guidance
ItemMilesTimeNote
Engine oil & filter5,000–10,000 mi6–12 monthsFollow the oil-life monitor if fitted
Tire rotation5,000–7,500 miEvery oil changeCheck pressure monthly
Engine air filter15,000–30,000 mi1–2 yearsSooner in dusty areas
Cabin air filter15,000–25,000 mi1–2 years
Brake fluid—2–3 yearsAbsorbs moisture over time
Coolant60,000–100,000 mi5–10 yearsLong-life coolants last longer
Spark plugs60,000–100,000 mi—Iridium/platinum plugs at the long end
12V battery—3–5 yearsHeat shortens battery life
  • Engine oil & filter5,000–10,000 mi
    6–12 months
  • Tire rotation5,000–7,500 mi
    Every oil change
  • Engine air filter15,000–30,000 mi
    1–2 years
  • Cabin air filter15,000–25,000 mi
    1–2 years
  • Brake fluid—
    2–3 years
  • Coolant60,000–100,000 mi
    5–10 years
  • Spark plugs60,000–100,000 mi
    —
  • 12V battery—
    3–5 years
Typical intervals for modern cars. Severe service (towing, short trips, extreme heat or cold) shortens them.
09 —FAQ

2018 CT6 questions

How many recalls does the 2018 Cadillac CT6 have?

2 safety recalls as of Nov 10, 2026, according to NHTSA. Recall repairs are free at a dealer. Check your VIN to see whether your car is included and whether the repair was done.

What are the most common 2018 Cadillac CT6 problems?

Owners filed 12 complaints with NHTSA. The most-cited components are power train (4), engine (4), steering (3). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.

What MPG does the 2018 Cadillac CT6 get?

The EPA rates the 2018 Cadillac CT6 at 21–25 mpg combined, depending on engine and drivetrain (3 versions rated).

Data from NHTSA & EPA · synced Nov 10, 2026