Headlight failure or clouding on the 2004 Chevrolet Impala
1 fire 1 of the 34 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 headlight failure or clouding gets reported
Owners of the 2004 Chevrolet Impala report headlight failure or clouding at a median of 82,500 miles. A quarter of the reports come in before 67,500 miles and a quarter after 147,500 miles, from 30 reports that carried an odometer reading.
A part like this is normally expected to survive 88,000 miles. It is the 8th most-reported problem on this model year.
The mileage distribution
The reported range runs from 42,500 miles at the tenth percentile to 180,000 miles at the ninetieth, a spread of 138,000 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.
3% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 42,000 miles | 68,002 miles | 82,500 miles | 146,750 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 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 $150–$1,800 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 16 model years of this car. It shows up earliest on the 2017, at a median of 100 miles, and latest on the 2008 at 150,000 miles.
By volume the 2002 carries the most reports, with 53; the 2004 has 34. 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.
Dt*: the contact stated the headlights worked intermittently. It occurred at highway speeds of 50 to 60 MPH. The headlights turned off without warning and remained off until the dimmer switch was pressed. There were no warning signals before this occurred. The vehicle was equipped with day time running lights. The vehicle has not been seen by a dealer. *ak . Incidental night time headlight failure occurred three times on 01/27/2006; once on 02/12/2006, involving high beam, and 3 times on 02/18/2006, involving 2 high beams. Subsequent occasional failure until the turn signal/dimmer switch was replaced on 03/14/2006. Contact paid $345 for parts and labor. *ak
Dt*: the contact stated the headlights worked intermittently. It occurred at highway speeds of 50 to 60 MPH. The headlights turned off without warning and remained off until the dimmer switch was pressed. There were no warning signals before this occurred. The vehicle was equipped with day time running lights. The vehicle has not been seen by a dealer. *ak . Incidental night time headlight failure occurred three times on 01/27/2006; once on 02/12/2006, involving high beam, and 3 times on 02/18/2006, involving 2 high beams. Subsequent occasional failure until the turn signal/dimmer switch was replaced on 03/14/2006. Contact paid $345 for parts and labor. *ak
Driving at night, headlights turned off on their own. Pulled forward several times on the dimmer switch and they came back on. If the dimmer switch is on lo-beam & switched to hi-beam, occasionally there is no "click". This is when the lights go off. If I hear the "click" the lights have not failed. Will schedule appointment with dealer to correct the problem. *jb
Also reported on the 2004 Chevrolet Impala
Instrument cluster or gauge failure
Other electrical problem
No-start or intermittent start failure
Ignition switch, key fob or immobilizer failure
Other engine problem
Other lighting problem
How far this goes
Complaints are voluntary, so 34 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 headlight failure or clouding happen on the 2004 Chevrolet Impala?
Across 30 owner reports that included an odometer reading, half were filed by 82,500 miles. A quarter were filed before 67,500 miles and a quarter after 147,500 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is headlight failure or clouding on the 2004 Chevrolet Impala?
34 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