Control module (ECM/PCM/BCM) failure on the 2005 Chevrolet Impala
1 crash 1 injury 2 of the 14 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 control module (ecm/pcm/bcm) failure gets reported
Owners of the 2005 Chevrolet Impala report control module (ECM/PCM/BCM) failure at a median of 35,000 miles. A quarter of the reports come in before 35,000 miles and a quarter after 105,000 miles, from 14 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 15th most-reported problem on this model year.
The mileage distribution
The reported range runs from 10,000 miles at the tenth percentile to 170,000 miles at the ninetieth, a spread of 160,017 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.
50% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 9,483 miles | 34,250 miles | 37,299 miles | 105,971 miles | 169,500 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 an injury 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 $700–$3,000 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 13 model years of this car. It shows up earliest on the 2000, at a median of 35,000 miles, and latest on the 2008 at 125,000 miles.
By volume the 2002 carries the most reports, with 54; the 2005 has 14. 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.
Car was running in my driveway while in park. I went in the house because I fogot my cell phone. About two minutes later the car crashed through my fence and I ran outside and jumped in it as we crashed through the garage door. The car had to be in park because the door opened from the outside and the wheels were locked so it drove straight. It has now been at the dealership for 20 days and nothing has been done. Gm hasn't been any help and my insurance cannot touch the car until gm inspects it. My rental runs out in 8 days.
Airbag light keeps coming on. Sensor is being replaced, but now dealership says it's the wiring under the seat. The cost to repair is $550! This is a gm certified vehicle warranty with 39,000 miles...car has 40,200 miles. *jb
Dt*: the contact stated while driving 55 MPH on normal road conditions, without any warning signal smoke started coming from under the dash board and noticed the A/C blower had seized. The contact pulled over and with police help disconnected the A/C blower fuse. The vehicle was taken to the dealership who determined over load current to the blower motor, the control module and the 30 amps fuse. A police report was taken. The vehicle was taken to a dealership who replaced the blower, control module and 30 amp fuse holders. The contact expressed concern due to the lack of warning signal in the presence of a serious electrical failure.
Also reported on the 2005 Chevrolet Impala
Other electrical problem
Instrument cluster or gauge failure
Other powertrain problem
No-start or intermittent start failure
Other engine problem
Other fuel system problem
How far this goes
Complaints are voluntary, so 14 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 control module (ecm/pcm/bcm) failure happen on the 2005 Chevrolet Impala?
Across 14 owner reports that included an odometer reading, half were filed by 35,000 miles. A quarter were filed before 35,000 miles and a quarter after 105,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is control module (ecm/pcm/bcm) failure on the 2005 Chevrolet Impala?
14 reports have been filed with NHTSA, about 0.2 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