Unclassified problem on the 2011 Toyota Corolla
12 crashes 10 injuries 22 of the 94 reports for this failure mention a crash, a fire, an injury or a death. Those are the owner's words on the complaint form, not a verified finding, and one report can mention more than one.
Only 25 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 unclassified problem gets reported
Owners of the 2011 Toyota Corolla report unclassified problem at a median of 50,000 miles. A quarter of the reports come in before 35,000 miles and a quarter after 70,000 miles, from 25 reports that carried an odometer reading.
It is the 44th most-reported problem on this model year.
The mileage distribution
The reported range runs from 25,000 miles at the tenth percentile to 105,000 miles at the ninetieth, a spread of 81,166 miles across the middle 80% of reports.
A spread this wide points at use rather than design. Towing, climate, service history and city mileage all move a failure like this, so the median is a weak guide to any individual car.
36% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 23,834 miles | 34,500 miles | 50,000 miles | 70,000 miles | 105,000 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
Of these reports, 12 a crash and 10 an injury are mentioned. Owners write their own complaints and the agency does not verify them, so read this as what the reports say happened rather than as a confirmed count.
The same failure on other years
The same failure is reported on 27 model years of this car. It shows up earliest on the 2020, at a median of 5,000 miles, and latest on the 2000 at 170,000 miles.
By volume the 2005 carries the most reports, with 276; the 2011 has 94. 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.
Rear seat belts must crossover each other to buckle. This involves the rear seat behind the driver and the middle rear seat. Toyota will not repair, or admit it is a defect. Also local dealership refuses to submit a complaint to corporate offices. *tr
While traveling on a highway, a vehicle struck the toyota corolla automobile on the front, passenger side. This collision caused the corolla to then strike a median wall. After the second impact, the corolla flipped at least two (2) times. The airbag never deployed. The entire front side was damaged in this accident. *tr
I came to an intersection and stopped, then took my foot off the brake before noticing that the light was still red. The other vehicle was roughly 30 feet away when I pushed on the brakes. I should have easily been able to stop. Brakes did not engage and I had been pushing them so hard and for so long that I fractured my ankle. There were not even skid marks at the accident scene. My car had front end frame damage from the accident (totaled), and the airbags never deployed. Additionally, in the past I had noticed the rpms rising for no reason while car was idling, and the acceleration issue, where the vehicle seemed to ?hang? Between speeds of about 35 and 40 and 60 and 65mph. The rpms I only noticed once-so I did not report it, and the ?hanging? Was my own ignorance (I haven?t had a 4 cylinder in a long time and this was my first?and probably last?toyota). I also had prior braking concerns-- ABS only made a noise (did not vibrate against pedal--again, my ignorance of how this vehicle was supposed to respond) and it was a very icy winter, so I assumed that I had been trying to stop on ice. The brakes behaved fine if I physically…
Also reported on the 2011 Toyota Corolla
Airbag inflator rupture
Other steering problem
Other speed control problem
Other body or interior problem
Cruise control failure
Other brake problem
How far this goes
This page is kept out of search results because 94 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 94 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 unclassified problem happen on the 2011 Toyota Corolla?
Across 25 owner reports that included an odometer reading, half were filed by 50,000 miles. A quarter were filed before 35,000 miles and a quarter after 70,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is unclassified problem on the 2011 Toyota Corolla?
94 reports have been filed with NHTSA, about 0.8 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