Wiring harness or short circuit on the 2008 Pontiac G6
1 fire 1 of the 53 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.
When wiring harness or short circuit gets reported
Owners of the 2008 Pontiac G6 report wiring harness or short circuit at a median of 67,500 miles. A quarter of the reports come in before 52,500 miles and a quarter after 90,000 miles, from 44 reports that carried an odometer reading.
A part like this is normally expected to survive 88,000 miles. It is the 7th most-reported problem on this model year.
The mileage distribution
The reported range runs from 15,000 miles at the tenth percentile to 117,500 miles at the ninetieth, a spread of 102,900 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.
11% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 14,900 miles | 52,000 miles | 68,200 miles | 88,750 miles | 117,800 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, 1 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.
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 6 model years of this car. It shows up earliest on the 2005, at a median of 35,000 miles, and latest on the 2010 at 120,000 miles.
By volume the 2008 is the worst of them, which makes this a problem of this specific year rather than of the model as a whole.
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.
Pontiac 2008 g6 3,368 mileage power steering error, then transmission malfunction. 4/25/08 phoned dealership and scheduled repair for 4/28/08. Had car towed to dealership on 4/27/08. 4/28/08 dealership discovered two broken wires in the vehicle speed sensor harness. They indicated that something had severed the wires and that the repair would not be covered by the warranty. I believe that there is a design flaw with the wiring harness. Why would two wires be left unshielded from the elements? The dealership via my request received an one time customer goodwill warranty approval. I had the mechanic show the area in question. He has reinforced the wires with electrical tape. It appears to be a great repair. I am not sure why the manufacture did not do this originally. Error codes po722, coooo and po700. I am concerned that this design will cause problems for other car owners. And could pose a safety issue if the wiring is severed at highway speed. *tr
Pontiac 2008 g6 3,368 mileage power steering error, then transmission malfunction. 4/25/08 phoned dealership and scheduled repair for 4/28/08. Had car towed to dealership on 4/27/08. 4/28/08 dealership discovered two broken wires in the vehicle speed sensor harness. They indicated that something had severed the wires and that the repair would not be covered by the warranty. I believe that there is a design flaw with the wiring harness. Why would two wires be left unshielded from the elements? The dealership via my request received an one time customer goodwill warranty approval. I had the mechanic show the area in question. He has reinforced the wires with electrical tape. It appears to be a great repair. I am not sure why the manufacture did not do this originally. Error codes po722, coooo and po700. I am concerned that this design will cause problems for other car owners. And could pose a safety issue if the wiring is severed at highway speed. *tr
Right low beam quit working, replaced headlight, worked for a very short time. Found wiring harness burnt at bulb. Contacted dealer to replace harness, they said I had to buy the whole headlight assembly for $160.00. I feel this is a gm defect, and gm should place a recall on this issue. They have a bulletin on this issue, but want to sell you the whole assembly. Bulletin # sb-10-08-42-001a. Why can't we just get the harness? Is replacing the whole assembly going to solve the issue? I have been pulled over 2 times over this issue. Gm needs to pay for this. *tr
Also reported on the 2008 Pontiac G6
Other steering problem
Cruise control failure
Headlight failure or clouding
Other electrical problem
Other lighting problem
Other brake problem
How far this goes
Complaints are voluntary, so 53 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 2008 Pontiac G6?
Across 44 owner reports that included an odometer reading, half were filed by 67,500 miles. A quarter were filed before 52,500 miles and a quarter after 90,000 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 2008 Pontiac G6?
53 reports have been filed with NHTSA, about 0.5 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