2018 Cadillac Ct6: what breaks, and at what mileage
What breaks on the 2018 Cadillac Ct6
On the 2018 Cadillac Ct6, the failure owners report most often is other engine problem, with 3 reports on file. Across every failure mode on this year, half the dated reports were filed before 25,000 miles. Overall it scores 74 out of 100, high risk for a 2018.
High risk for a 2018 — 158th riskiest of the 251 2018 vehicles we can rate. 16 owner reports; fleet size borrowed from other years of the same model.
What breaks on the 2018 Cadillac Ct6
Owners have reported 11 named failure modes on the 2018 Cadillac Ct6, and the three most-reported carry 44% of everything filed.
Other engine problem leads with 3 reports and about 0.3 per 1,000 vehicles.
Other powertrain problem follows with 2 reports, median 25,000 miles.
Other steering problem follows with 2 reports, median 35,000 miles.
By system, the reports fall mostly into engine (3), transmission (3) and steering (2).
At what mileage it happens
Too few of the reports on this year carry an odometer reading to describe the timing: 7 of them do. The mileages quoted elsewhere on this page come from the modes that have enough of them.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
How reports accumulate
Every report with an odometer reading, cumulative, from 0 to 200,000 miles. A curve that climbs early is a car with early problems, whatever its total.
- Line share of reports filed by that mileage
What happens when these parts fail
Nothing in the reports on the 2018 Cadillac Ct6 mentions a crash, a fire or an injury. That is the ordinary case and it is worth stating: most defect complaints are about a car that stopped working, not one that hurt somebody.
The average severity weight across every report on this year is 3.69, where a stalled engine or a failed airbag weighs many times more than a rattling trim panel, and a figure this high means the reports are dominated by failures with safety consequences rather than annoyances. The weighting is set out in full on the methodology page.
What the top failures cost to put right, as editorial estimates for an independent US shop rather than figures from NHTSA: other engine problem at $300–$4,000, other powertrain problem at $400–$4,500, other steering problem at $350–$2,400 and complete transmission failure at $2,800–$8,000. Dealer labour, a seized bolt or a part that is no longer made can push any of these past the top of its range.
38% of the reports on this year sit in the engine, transmission, drivetrain or cooling systems — the four where a repair bill is usually four figures.
Every reported failure mode
| Failure mode | System | Reports | With reading | 25th | Median | 75th | Per 1,000 | Typical repair | Severity |
|---|---|---|---|---|---|---|---|---|---|
| Other engine problem | engine | 3 | 1 | — | 22k | — | 0.3 | $300–$4,000 | High |
| Other powertrain problem | transmission | 2 | 2 | — | 24k | — | 0.2 | $400–$4,500 | High |
| Other steering problem | steering | 2 | 1 | — | 36k | — | 0.2 | $350–$2,400 | High |
| Complete transmission failure | transmission | 1 | 0 | — | — | — | 0.1 | $2,800–$8,000 | Critical |
| Lane keep or steering assist fault | adas | 1 | 1 | — | 36k | — | 0.1 | $200–$1,600 | High |
| Cruise control failure | adas | 1 | 1 | — | 36k | — | 0.1 | $200–$1,400 | High |
| Headlight failure or clouding | lighting | 1 | 0 | — | — | — | 0.1 | $150–$1,800 | Moderate |
| Other fuel system problem | fuel | 1 | 1 | — | 22k | — | 0.1 | $300–$2,200 | High |
| Other brake problem | brakes | 1 | 0 | — | — | — | 0.1 | $300–$1,800 | High |
| Other suspension problem | suspension | 1 | 0 | — | — | — | 0.1 | $350–$2,000 | Moderate |
| Other body or interior problem | body | 1 | 0 | — | — | — | 0.1 | $200–$2,000 | Moderate |
| Unclassified problem | other | 1 | 0 | — | — | — | 0.1 | — | Moderate |
This year had no usable recall paperwork, so the fleet-size estimate is the median of other years of the same model. Repair costs are typical independent-shop ranges for the failure, not figures from these reports.
How often, against how many were built
Scaled by an estimate of how many of these cars exist, the 2018 Cadillac Ct6 draws about 1.8 per 1,000 vehicles, which puts it in the 77th percentile of complaint rates among 2018 vehicles we can rate.
That denominator is the weakest number on the page and it is fair to say so plainly. This year had no usable recall paperwork, so the fleet-size estimate is the median of other years of the same model.
The working figure is 8,678 vehicles. If the true number is twice that, every rate on this page is half what it says; the ranking against other 2018 vehicles, which is what the risk score uses, is far more robust than the rate itself.
How it ranks in the 2018 field
The score at the top of the page, placed among its peers. The zones are the same thresholds the scorer applies, read out of the scorer itself, so the picture and the band word cannot disagree.
Scores are ranked within the model year, never across years, because an older car has had longer to accumulate reports.
- Left fewer and less serious reports
- Right more, or worse
- Marker this vehicle
Better and worse years of the same car
High risk for a 2018 — 158th riskiest of the 251 2018 vehicles we can rate. Every score on this site is a rank inside its own model year, which is what makes a 2004 and a 2019 comparable at all.
Across the 5 model years of this car that carry enough reports to score, 2019 comes out best at 65 and 2017 worst at 82, with 2018 itself at 74.
If the model year is negotiable, 2019 scores lower than 2018 by a margin worth acting on. Same body, same engines, different luck — usually a supplier change or a mid-cycle fix, which the complaint data can show but never explain.
Within the 2016–2020 generation specifically, 2019 is the strongest year at 65 and 2017 the weakest at 82.
Scores compare each year against other cars of the same model year, so a low number on an older car is a real result and not an artefact of age.
Shorter is better. Years with too few reports to score are shown without a bar rather than as a zero, because no data is not good news.
Within the 2016-2020 generation, 2019 Cadillac Ct6 scores best at 65 and 2017 Cadillac Ct6 worst at 82.
What this page cannot tell you
16 owner reports; fleet size borrowed from other years of the same model. Every count on this page is therefore a floor: it is the number of owners who went to the trouble of filing with a federal agency, which is a small and self-selected fraction of the owners who had the fault.
Of those 16 reports, 7 carried an odometer reading, so the mileages here describe 44% of the sample rather than all of it. Owners also round: readings pile up on multiples of ten thousand, which is why this site publishes "about 90,000 miles" and not "91,438".
Named failure modes come from matching phrases in the complaint text, so a badly worded complaint can land in the wrong bucket. The effect washes out across hundreds of reports and does not wash out across five.
And nothing here predicts what one car will do. These are other people's complaints, filed years apart, on cars maintained by strangers. Read the page as a map of where this model year has previously gone wrong, then have the specific car in front of you inspected.
Questions this page answers
What are the most common problems with the 2018 Cadillac Ct6?
The most-reported failures are other engine problem (3 reports, median 20,000 miles), other powertrain problem (2 reports, median 25,000 miles) and other steering problem (2 reports, median 35,000 miles). Counts come from owner complaints filed with NHTSA, which are voluntary, so they show what owners bothered to report rather than every fault that occurred.
Is the 2018 Cadillac Ct6 reliable?
It scores 74 out of 100 on our risk index, which is high — 158th riskiest of the 251 2018 vehicles we can rate. The score is a comparison against other 2018 vehicles, not a prediction about any individual car, and it is built from complaint rates, severity and how early failures appear.
Which year of the Cadillac Ct6 is best?
Within the 2016–2020 generation, 2019 scores best at 65 out of 100 and 2017 worst at 82. Same body, same engines, different luck.
Where this comes from. Every figure above is computed from NHTSA owner complaints and recall records for this exact make, model and year. Complaints are voluntary and self-selected, so treat counts as a floor. The methodology page writes out each formula, and the same numbers are available as JSON.
What breaks at my mileage Compare with another car
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed