Wiring harness or short circuit on the 2009 Subaru Outback
When wiring harness or short circuit gets reported
Owners of the 2009 Subaru Outback report wiring harness or short circuit at a median of 120,000 miles. A quarter of the reports come in before 100,000 miles and a quarter after 180,000 miles, from 9 reports that carried an odometer reading.
A part like this is normally expected to survive 88,000 miles. It is the 1st most-reported problem on this model year.
The mileage distribution
The reported range runs from 35,000 miles at the tenth percentile to 180,000 miles at the ninetieth, a spread of 146,749 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.
22% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 35,251 miles | 99,500 miles | 120,000 miles | 182,000 miles | 182,000 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 2013, at a median of 40,000 miles, and latest on the 2009 at 120,000 miles.
By volume the 2005 carries the most reports, with 12; the 2009 has 12. 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.
Problem 1: experienced rear wiper (station wagon) not working. Car still under warranty, took it to the dealer and was told the wiring harness that goes through the hinge area was broken. It was repaired. Now the car has 72,000 miles and I am having rear wiper problems again as well as the rear door not locking. Wires frayed and broken again. This is a known issue both with subaru and on the forums on the web. This is a poor design and possibly dangerous as it can cause the rear lights to fail. Failure time frame was almost double mileage from the previous failure. (35,251 - 72,000). Problem 2: air bag light keeps coming on. Have had it to the mechanic several times to be checked out and reset. This is also a known problem with subaru and on the web forums. This is a serious safety issue as the air bags could fail to deploy. Subaru may say the airbags are a "secondary" safety feature, but to me they are extremely important. Airbag deployment can be the difference between life and death in an accident. Please investigate! *tr
Problem 1: experienced rear wiper (station wagon) not working. Car still under warranty, took it to the dealer and was told the wiring harness that goes through the hinge area was broken. It was repaired. Now the car has 72,000 miles and I am having rear wiper problems again as well as the rear door not locking. Wires frayed and broken again. This is a known issue both with subaru and on the forums on the web. This is a poor design and possibly dangerous as it can cause the rear lights to fail. Failure time frame was almost double mileage from the previous failure. (35,251 - 72,000). Problem 2: air bag light keeps coming on. Have had it to the mechanic several times to be checked out and reset. This is also a known problem with subaru and on the web forums. This is a serious safety issue as the air bags could fail to deploy. Subaru may say the airbags are a "secondary" safety feature, but to me they are extremely important. Airbag deployment can be the difference between life and death in an accident. Please investigate! *tr
The brake lights, hatch lock, wiper and other electrical components on the rear part of my subaru 2009 outback stopped working or working erratically. I checked the rubber boot containing the rear wiring harness for damage and discovered 13 out of 14 wires were either completely broken, or the insulation was worn, exposing bare conductor. In addition to the rear electrical issues, I replaced the bulbs for the headlights at least four times in a two year period. The am channel on my radio no longer receives signals. The rear electrical problems are causing a safety hazard due to the brake/tail lights not functioning, or the rear windshield wiper not working. Subaru is not responsive to this design flaw.
Also reported on the 2009 Subaru Outback
Other electrical problem
Airbag inflator rupture
Airbag warning light or occupant sensor fault
Other suspension problem
Other body or interior problem
Head gasket failure
How far this goes
Complaints are voluntary, so 12 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 wiring harness or short circuit happen on the 2009 Subaru Outback?
Across 9 owner reports that included an odometer reading, half were filed by 120,000 miles. A quarter were filed before 100,000 miles and a quarter after 180,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is wiring harness or short circuit on the 2009 Subaru Outback?
12 reports have been filed with NHTSA, about 0.4 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