Unclassified problem on the 2015 Ford F-350 SD
2 fires 2 of the 23 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 12 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 2015 Ford F-350 SD report unclassified problem at a median of 25,000 miles. A quarter of the reports come in before 10,000 miles and a quarter after 55,000 miles, from 12 reports that carried an odometer reading.
It is the 41st most-reported problem on this model year.
The mileage distribution
The reported range runs from 5,000 miles at the tenth percentile to 115,000 miles at the ninetieth, a spread of 111,320 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.
58% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 5,380 miles | 9,700 miles | 24,283 miles | 56,250 miles | 116,700 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, 2 a fire is 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 2020, at a median of 5,000 miles, and latest on the 2005 at 125,000 miles.
By volume the 2019 carries the most reports, with 37; the 2015 has 23. 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.
Bought truck brand new in december 2014. At approx. 5,000 (still during the diesel engine break in period) while driving thru an intersection in traffic the truck and motor started violently shaking/bucking with the motor making a loud knocking noise- the truck then had a total loss of power in which I was unable to safely accelerate. The truck then went to the dealer in which I was told they could find nothing wrong. The truck now been in an out of the shop numerous times because the problem keeps occurring. Ford released a tsb stating that its normal for their trucks to experience "rough running" during the exhaust regen cycle. The experiences that have occurred with my truck have no correlation to the regen cycle and seem to happen at random times. The truck has become dangerous to drive and pull my horses with as the shaking/bucking is so violent and with a loss of power and unable to accelerate its scary to even attempt to drive in traffic.
Runs rough, shakes, vibration, the exhaust cleaning system will not finish, and the truck has had multiple occurences but it was worse today, when pushing on the gas pedal it would just keep declining in speed and it was like it could not get any power so I parked the truck called ford had it towed, and while waiting I thought I would start it and back up and take to see if it was still bad and it would not even go in reverse so I put truck back in park and shut it off, ford says there is an issue with the system but they have not figured it out yet nor do they no how to even fix it at this point and they sent me home in the truck.
I have a 2015 6.7 diesel. It goes through the exhaust filter cleaning about every 200 miles while the vehicle is moving. After this process starts the engine runs extremely rough, like it's ready to drop out, losses power & the entire vehicle shakes. There is also a very loud clatter if I step on the gas. There are no engine warning lights while this is happening.
Also reported on the 2015 Ford F-350 SD
Other steering problem
Other suspension problem
Other engine problem
Other fuel system problem
Other powertrain problem
Other wheel or tire problem
How far this goes
This page is kept out of search results because 23 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 23 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 2015 Ford F-350 SD?
Across 12 owner reports that included an odometer reading, half were filed by 25,000 miles. A quarter were filed before 10,000 miles and a quarter after 55,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is unclassified problem on the 2015 Ford F-350 SD?
23 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