Model year guide

2018 Cadillac ct6

Recalls, most-reported problems, crash-test ratings, fuel economy and what a 2018 Cadillac ct6 is worth — from official NHTSA and EPA data. 16 on record.

2018 Cadillac ct6 — representative photo
Representative photo · via Wikimedia Commons

2018 Cadillac ct6 at a glance

Safety recallsNone
Owner complaints12
Combined25 mpg

Included: that car's specs and build sheet, model-year recall campaigns and a fair price.

2018 Cadillac ct6 recalls 0

No NHTSA safety-recall campaigns are on record for the 2018 Cadillac ct6.

Source: U.S. NHTSA, checked 4 Nov 2026. A campaign covers the model year; to see whether a particular car still needs the repair, check its VIN on NHTSA.gov or ask a franchised dealer.

2018 Cadillac ct6 common problems

The most-reported problem areas across all 12 owner complaints filed with NHTSA — and what to check before you buy.

Power Train
Drive through every gear: watch for slipping, hard or delayed shifts, and shudder. Check for transmission/driveline leaks and noises.
Engine
Listen for knocks or ticking, check for leaks and blue/white exhaust smoke, and make sure it doesn't overheat. No check-engine light should be on.
Steering
Steering should be tight and centered — no play, clunks or wandering. Test at low and highway speed; listen for power-steering whine.
Fuel/propulsion System
Check for fuel or battery warnings, hard starts and stalling. On a hybrid/EV, confirm charging and range behave normally.
Suspension
Listen for clunks over bumps, check the car sits level, and look for uneven tire wear and worn shocks or struts.
Structure
Inspect for rust, fresh undercoating, mismatched paint, uneven panel gaps and any sign of prior collision or frame repair.

2018 Cadillac ct6 MPG & running costs

Combined25 mpg
City22 mpg
Highway30 mpg
Est. annual fuel cost$3,300
EPA size classLarge Cars
TransmissionAutomatic (S8)
Forced inductionTurbocharged
Engine start-stopYes
Passenger volume110 cu ft
Cargo volume15 cu ft
5-yr fuel cost vs average new car$4,500 more

Source: U.S. EPA / DOE fueleconomy.gov.

Estimated 5-year cost to own

A rough guide to what running a 2018 Cadillac ct6 costs over five years and 75,000 miles.

Fuel (5 yrs)$16,500
Fuel only$16,500
Per mile$0.22

How this is estimated: fuel is the U.S. EPA annual cost at 15,000 miles a year. There aren't enough comparable listings to estimate depreciation for this model, so it is left out. Not included: insurance, maintenance, repairs, taxes, registration and finance costs. Treat it as a comparison guide, not a quote.

Dimensions & weight

Length
203.9 in
Width
74.0 in
Height
57.9 in
Wheelbase
122.0 in
Curb weight
3,646–4,385 lb
Front track
64.2 in
Rear track
65.0 in

Manufacturer-reported figures for the 2018 Cadillac ct6 — ranges cover the 5 body / drivetrain versions on record. Source: Transport Canada vehicle specifications via NHTSA.

Investigations & service bulletins

Manufacturer service bulletins 1096

Technical notes the manufacturer sent to dealers about known issues and fixes. Useful to mention to a mechanic — they are not recalls and repairs may not be covered. Showing the 10 most recent of 1096.

This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.

Bulletin PIT5698F · Sep 2026

This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering

Bulletin PIP5700H · Sep 2026

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

Bulletin PIP4902W · Sep 2026

PI to help diagnose A/C concern

Bulletin PIT5099J · Jul 2026

This preliminary information communicates information about how to determine if a wheel and tires size change is available.

Bulletin PIT3271Q · Apr 2026

This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.

Bulletin PIP6104 · Mar 2026

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

Bulletin PIP4902V · Mar 2026

This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering

Bulletin PIP5700G · Jan 2026

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

Bulletin PIP4902U · Jan 2026

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 vibration conditions without utilizing the support of General M…

Bulletin PIT5214G · Nov 2025

Source: NHTSA Office of Defects Investigation, listed for the CT6 RWD. Model-year data, not specific to one car.

Canadian recalls 2

Transport Canada recall campaigns for the 2018 Cadillac ct6. Relevant if the car was first sold in, or imported from, Canada.

Seats And Restraints

Certain vehicles may be equipped with rear seat belt retractors that do not comply with the requirements of Canada Motor Vehicle Safety Standard (CMVSS) 208 - Occupant Protection in Frontal Impacts. The automatic-locking retractors (ALR) of the rear seat belts may not switch to a locked position when the seat belt is fully pulled out of the retractor. If used to secure a child…

Transport Canada #2018535 · Sep 2018

Powertrain

Certain vehicles fail to comply with the requirements of Canada Motor Vehicle Safety Standard (CMVSS) 210.2 - Lower Universal Anchorage Systems for Restraint Systems and Booster Seats. A small amount of structural adhesive may have been inadvertently applied to the child seat anchorage bar during the assembly process. If this condition is present, the child seat would not be ab…

Transport Canada #2018348 · Jun 2018

Source: Transport Canada Motor Vehicle Safety Recalls Database.

About the Cadillac ct6

The Cadillac CT6 is a full-size luxury car manufactured by Cadillac starting in 2016 over two generations.

From Wikipedia, licensed CC BY-SA 4.0. Describes the model line in general, not this model year specifically.

2018 Cadillac ct6 trims & engines on record

Trims
Luxury · Premium Luxury (CSAV)
Engines
3.6L 6-cyl

2018 Cadillac ct6 vehicles on record

2018 Cadillac ct6 2018 Cadillac ct6 Luxury1G6KD5RS4JU111288 2018 Cadillac ct6 2018 Cadillac ct6 Luxury1G6KD5RS0JU102717 2018 Cadillac ct6 2018 Cadillac ct61G6KB5RS3JU100319 2018 Cadillac ct6 2018 Cadillac ct6 Premium Luxury (CSAV)1G6KG5RS8JU120969 2018 Cadillac ct6 2018 Cadillac ct61G6KF5RS2JU150360 2018 Cadillac ct6 2018 Cadillac ct61G6KG5RS0JU138009 2018 Cadillac ct6 2018 Cadillac ct61G6KH5R65JU127460 2018 Cadillac ct6 2018 Cadillac ct61G6KD5RS4JU151239 2018 Cadillac ct6 2018 Cadillac ct61G6KD5RSXKU117842 2018 Cadillac ct6 2018 Cadillac ct61G6KC5RX7JU124891 2018 Cadillac ct6 2018 Cadillac ct61G6KB5RS6JU157081 2018 Cadillac ct6 2018 Cadillac ct61G6KD5RS9KU118559 2018 Cadillac ct6 2018 Cadillac ct61G6KG5RS3JU137940 2018 Cadillac ct6 2018 Cadillac ct61G6KG5RS2JU159542 2018 Cadillac ct6 2018 Cadillac ct61G6KT5R63KU116005 2018 Cadillac ct6 2018 Cadillac ct61G6KA5RX1JU130966

Other Cadillac ct6 model years

2019 2017 2016

2018 Cadillac ct6 — frequently asked questions

Does the 2018 Cadillac ct6 have any safety recalls?

NHTSA lists no safety-recall campaigns for the 2018 Cadillac ct6. Whether an individual car still needs a recall repair depends on its VIN — check it on NHTSA.gov or ask a franchised dealer. Recall repairs are done at no charge.

What are the most common problems with the 2018 Cadillac ct6?

Across all 12 owner complaints filed with NHTSA, the most-reported problem areas are power train, engine, steering.

What gas mileage does the 2018 Cadillac ct6 get?

The 2018 Cadillac ct6 has a U.S. EPA estimate of 25 mpg combined (22 city / 30 highway).

Sources: NHTSA (recalls, complaints, crash tests), U.S. EPA (fuel economy). Vehicle data only — CarLogs never shows owner information.