Control module (ECM/PCM/BCM) failure on the 2002 Honda Accord
When control module (ecm/pcm/bcm) failure gets reported
Owners of the 2002 Honda Accord report control module (ECM/PCM/BCM) failure at a median of 50,000 miles. A quarter of the reports come in before 35,000 miles and a quarter after 70,000 miles, from 22 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 11th most-reported problem on this model year.
The mileage distribution
The reported range runs from 35,000 miles at the tenth percentile to 95,000 miles at the ninetieth, a spread of 56,479 miles across the middle 80% of reports.
Reports bunched into a band this tight usually mean the component has a life of its own: it goes at roughly the same mileage regardless of who owns it.
9% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 36,500 miles | 37,300 miles | 51,000 miles | 67,707 miles | 92,979 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 $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 22 model years of this car. It shows up earliest on the 2019, at a median of 15,000 miles, and latest on the 2020 at 130,000 miles.
By volume the 2000 carries the most reports, with 123; the 2002 has 29. 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.
Srs light activited due to defective opds sensor. Defective sensor would have prevented the air bag from deploying in the event of an accident. Car only has 68k miles. Vehicle is garaged indoors and has never been in any type of accident and/or incident. A non-mechanical critical part should not fail in such a manor. Corrective maintenance work was not covered by warranty. Dealer could not provide a good answer as to why the part failed to function. *ak
The SRS warning lite is continually lit at 49,000 miles. After the obdii scanner was connected the system reported code 7-1. Code 7.1 refers to SRS controller unit failure. The car is well maintained and cleaned. The recomened repair is to replace the SRS controller unit at a cost of over 500 dollars. The SRS unit is computer controlled as even though the other engine computers are warantyed for 8/80,000 the SRS unit is not. I have now been told that the car I purchased for quality and reliability no longer has functioning airbags or automatic seat belt tensioners. Honda has opened a case and I must go through my local dealer to request a waranty extention on the part. Rd major problem with the car.*ak
Srs light came on for no reason. Took car to dealer, they advised no problem. Reset it. Light came on again, took it back to the dealer. They advised again, no problem. Possibly the control unit...reset it, but advised light may come on again. They cannot be sure that unit is the problem, can repair, but cannot be sure that it will not happen again. Light is now back on. Unsure if I have an accident if my airbag will deploy or if it will just deploy for no reason.*ak
Also reported on the 2002 Honda Accord
Other powertrain problem
Complete transmission failure
Airbag warning light or occupant sensor fault
Other body or interior problem
Other electrical problem
Seat belt or retractor failure
How far this goes
Complaints are voluntary, so 29 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 2002 Honda Accord?
Across 22 owner reports that included an odometer reading, half were filed by 50,000 miles. A quarter were filed before 35,000 miles and a quarter after 70,000 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 2002 Honda Accord?
29 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