Overheating on the 2011 Hyundai Sonata
Only 5 reports for this mode came with an odometer reading, which is too few for percentiles to mean anything. The page is here because someone linked to it; treat the figures as anecdotes, and see the full report for this year instead.
When overheating gets reported
There are 17 reports of overheating on the 2011 Hyundai Sonata, 5 with a mileage attached. That is too few to place the failure on the odometer with any confidence.
A part like this is normally expected to survive 102,000 miles. It is the 37th most-reported problem on this model year.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| — | — | 90,000 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 $400–$3,500 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 8 model years of this car. It shows up earliest on the 2015, at a median of 1,100 miles, and latest on the 2011 at 90,000 miles.
By volume the 2012 carries the most reports, with 21; the 2011 has 17. 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.
While driving on the grand central parkway going 50 MPH the car suddenly lost all power and stalled. The engine had seized due to loss of oil. There had been no oil warning light. Car had been serviced regularly since purchase. Car was towed to dealer. Dealer informed us that short block needed to be replaced & work was done. We have tried to find an oil warning light on the a instrument cluster and have had no luck so we are not confident this won't happen again, creating another unsafe situation the car did not feel right while we drove it. At one point, about a month or so later, it stalled out. We called hyundai for a tow but the car eventually started. A week later the car overheated and we brought it to a service station & checked the coolant. It was low & so we added coolant. We also checked the oil & found it down by one quart. (this was about 2 thousand miles after the short block was replaced). Car continued to overheat in traffic. We took the car to hyundai for service where they discovered that the fan was not working. We asked if it was normal for the car to stall while on the road if it overheats, & we're told yes it…
I have had several occurrences where it feels as if my car is going to stall. I attempted to start my car this morning where it failed to respond. The starter was replaced in 2012, the battery replaced 2013 and now hyundai claims it is my starter lever that also needs to be replaced (2014). I have read numerous complaints from other hyundai owners complaining of the same issue. Now, I have to pay over $300 to have the starter lever replaced which will now be my 3rd issue since I have had this car. Also, I did suffer from the rear brake light issue that was recently recalled and have had to replace my back light several times before the recall was initiated. Due to my continuation of brake light issues post recall change, I am told that the lamp has melted due to the possibility of the bulb overheating the lamp. I do not see how any of these issues are my fault and believe that hyundai should recall, and replace all of these malfunctions. *tr
Tl* the contact owns a 2011 hyundai sonata. The contact stated that the vehicle overheated without warning. The vehicle was taken to an unknown dealer where it was diagnosed that the engine head was cracked and caused coolant to leak. The manufacturer was not made aware of the failure. The vehicle was not repaired. The VIN was not available. The failure mileage was 90,000.
Also reported on the 2011 Hyundai Sonata
Other steering problem
Other engine problem
Steering column or shaft failure
Airbag warning light or occupant sensor fault
Other electrical problem
Tail light, brake light or signal failure
How far this goes
This page is kept out of search results because 17 reports is not enough to publish percentiles from. It stays reachable because somebody looking at this exact car would rather see the reports than be told there are none.
Complaints are voluntary, so 17 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 overheating happen on the 2011 Hyundai Sonata?
Across 5 owner reports that included an odometer reading, half were filed by 90,000 miles. A quarter were filed before — and a quarter after —. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is overheating on the 2011 Hyundai Sonata?
17 reports have been filed with NHTSA, about 0.1 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