Cruise control failure on the 2018 Hyundai Sonata
When cruise control failure gets reported
Owners of the 2018 Hyundai Sonata report cruise control failure at a median of 20,000 miles. A quarter of the reports come in before 5,000 miles and a quarter after 20,000 miles, from 8 reports that carried an odometer reading.
A part like this is normally expected to survive 72,000 miles. It is the 14th most-reported problem on this model year.
The mileage distribution
The reported range runs from 400 miles at the tenth percentile to 20,000 miles at the ninetieth, a spread of 21,208 miles across the middle 80% of reports.
A window that narrow is the signature of a part that fails on its own schedule rather than on how the car is driven — which is usually a design or supplier problem rather than wear and tear.
100% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 400 miles | 6,850 miles | 18,363 miles | 19,725 miles | 21,608 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Putting it right typically runs $200–$1,400 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 14 model years of this car. It shows up earliest on the 2015, at a median of 10,000 miles, and latest on the 2010 at 125,000 miles.
By volume the 2011 carries the most reports, with 69; the 2018 has 11. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
Tl* the contact owns a 2018 hyundai sonata. While operating the vehicle, the automatic emergency braking system malfunctioned. On several occasions, the vehicle failed to automatically stop when a second vehicle was present. The failure occurred while driving in reverse and while driving at highway speeds with the cruise control activated. The vehicle was taken to napleton hyundai glenview (1620 waukegan rd., glenview, il) and the contact was informed that the failure was normal. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 400. *tt consumer stated braking works when car has cruise control activated, when relying in "aeb" nothing happens. Vehicle purchase date should be on or before incident date updated 9/21/18*jb
Tl* the contact owns a 2018 hyundai sonata. While operating the vehicle, the automatic emergency braking system malfunctioned. On several occasions, the vehicle failed to automatically stop when a second vehicle was present. The failure occurred while driving in reverse and while driving at highway speeds with the cruise control activated. The vehicle was taken to napleton hyundai glenview (1620 waukegan rd., glenview, il) and the contact was informed that the failure was normal. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 400. *tt consumer stated braking works when car has cruise control activated, when relying in "aeb" nothing happens. Vehicle purchase date should be on or before incident date updated 9/21/18*jb
Also reported on the 2018 Hyundai Sonata
Other engine problem
Excessive oil consumption
Other electrical problem
No-start or intermittent start failure
Wiring harness or short circuit
Other powertrain problem
How far this goes
Complaints are voluntary, so 11 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does cruise control failure happen on the 2018 Hyundai Sonata?
Across 8 owner reports that included an odometer reading, half were filed by 20,000 miles. A quarter were filed before 5,000 miles and a quarter after 20,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is cruise control failure on the 2018 Hyundai Sonata?
11 reports have been filed with NHTSA, about 0.3 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
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