Wiring harness or short circuit on the 2003 Chevrolet Silverado 1500
1 crash 1 fire 2 of the 8 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 2003 Chevrolet Silverado 1500 report wiring harness or short circuit at a median of 115,000 miles. A quarter of the reports come in before 85,000 miles and a quarter after 180,000 miles, from 8 reports that carried an odometer reading.
A part like this is normally expected to survive 88,000 miles. It is the 22nd most-reported problem on this model year.
The mileage distribution
The reported range runs from 85,000 miles at the tenth percentile to 180,000 miles at the ninetieth, a spread of 95,000 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.
0% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 85,000 miles | 85,000 miles | 113,677 miles | 180,000 miles | 180,000 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, 1 a crash and 1 a fire 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.
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 20 model years of this car. It shows up earliest on the 2015, at a median of 40,000 miles, and latest on the 2002 at 220,000 miles.
By volume the 2020 carries the most reports, with 24; the 2003 has 8. 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.
Service air bag light came on intermittently. Vehicle taken to a dealer where a wiring harness was replaced. Subsequent, the vehicle was involved in a head-on crash severe enough to total the vehicle. Air bags did not deploy. A replacement vehicle (same model) was purchased, it too has a "service airbag" light. *tr
Tl* the contact owns a 2003 chevrolet silverado 1500. The contact stated while driving 30 MPH, smoke and flames were emitted from under of the dashboard into the cab of the vehicle. The contact mentioned that he was able merge to the side of the road and disconnect the wiring harness, which stopped the flames. The fire department was not contacted and no injuries were reported. The vehicle was taken to a local mechanic who diagnosed that the blower motor, blower motor resistor, wiring harness and temperature control switch needed to be replaced. The manufacturer was made aware of the failure who did not offer any assistance since the vehicle was not included in any recalls. The vehicle was repaired. The failure mileage was 137,254 and the current mileage was 138,620.
Reduced engine power. This has been occurring off and on for about 9 months, have taken it to dealer multiple times and replaced everything that was said would fix the problem. The problem still occurs even after replacing: accelerator and receiver on throttle body as well as checking wiring harness for issues. Essentially, the vehicle will lose the function of the accelerator without warning at any given time during the use of the vehicle. The dealer has told me that they don't have any idea why it still is having this issue...the other day the vehicle was being driven and reduced engine power mode set in and at the same time the power steering went out. Thought the power steering going out at the same time was a one time deal but it happened again the very next day. The vehicle had this issue on the highway the other day and nearly caused an accident. It is shocking that there are not thousands of complaints with this same issue, if you look up forums on this topic there are over 200,000 threads on this very issues. There are thousands of forum complaints about reduced engine power and how people have spent $1000 plus at the…
Also reported on the 2003 Chevrolet Silverado 1500
Loss of braking
Instrument cluster or gauge failure
Other brake problem
Brake line, hose or caliper failure
ABS module or sensor failure
Other electrical problem
How far this goes
Complaints are voluntary, so 8 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 2003 Chevrolet Silverado 1500?
Across 8 owner reports that included an odometer reading, half were filed by 115,000 miles. A quarter were filed before 85,000 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 2003 Chevrolet Silverado 1500?
8 reports have been filed with NHTSA, about 0.3 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