Unclassified problem on the 2013 GMC Terrain
6 crashes 8 injuries 1 death 15 of the 24 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 13 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 2013 GMC Terrain report unclassified problem at a median of 60,000 miles. A quarter of the reports come in before 20,000 miles and a quarter after 80,000 miles, from 13 reports that carried an odometer reading.
It is the 55th most-reported problem on this model year.
The mileage distribution
The reported range runs from 5,000 miles at the tenth percentile to 90,000 miles at the ninetieth, a spread of 88,400 miles across the middle 80% of reports.
When the reports scatter this far, the mileage is telling you about how these cars were driven more than about the part itself.
38% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 3,000 miles | 19,000 miles | 60,660 miles | 77,550 miles | 91,400 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, 6 a crash, 8 an injury and 1 a fatality 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 12 model years of this car. It shows up earliest on the 2018, at a median of 5,000 miles, and latest on the 2012 at 70,000 miles.
By volume the 2011 carries the most reports, with 33; the 2013 has 24. 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 decelerating from about 35 or 40 MPH when you apply the brakes then come to complete stop the vehicle on the rear end will start to loudly thump, it starts out slowly thumping and begins to speed up and when you start to release the brake it begins to slow down and stop once one begins to accelerate. We have had the issue ongoing for about 3 months now, it started about 2 or 3 weeks after we got the vehicle and it has been in the shop about 6 times. The vehicle had about 2200 miles on it and the dealer said it was a 'like new' loaner vehicle. The mechanics said they thought it was a exhaust, something with the rear brakes, or maybe a panel in the back of the vehicle, they have tightened, and replaced almost the entire rear of the vehicle and the problem still persists. They cannot figure out the problem and I am afraid it might become a safety hazard. The dealer has called gmc and the dealer said gmc will not do anything for us. *jb
Vehicle was involved in a severe accident where the other driver ran a stop sign and hit terrain causing severe front end and engine damage. Air bags failed to deploy. Injures included were neck and back. Damage was severe enough to cause airbags to deploy but never did . Having an indept inspection conducted as to why they never deployed. *tr
We bought my daughter a brand new gmc terrain. Her old gmc had over 200,000 miles on it. She had a blown out tire prior to this incident. She was not driving fast and there was not reason for the tire to blow out. She is on her way home from a friends house and goes over a railroad track, not speeding. Another tire blows out. Has to get car towed. The tow car to gmn dealership. Days in shop airbag issues, tire had to be replaced. Takes over 4 days to be repaired has to go back. Over $1700.00 bill. This is second time this has happened. *tr
Also reported on the 2013 GMC Terrain
Excessive oil consumption
Other engine problem
Timing chain, belt or tensioner failure
Other visibility problem
Complete engine failure or seizure
Oil leak
How far this goes
This page is kept out of search results because 24 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 24 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 2013 GMC Terrain?
Across 13 owner reports that included an odometer reading, half were filed by 60,000 miles. A quarter were filed before 20,000 miles and a quarter after 80,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is unclassified problem on the 2013 GMC Terrain?
24 reports have been filed with NHTSA, about 0.2 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