Control module (ECM/PCM/BCM) failure on the 2004 Chevrolet Silverado
Only 6 reports for this mode came with an odometer reading, which is too few for percentiles to mean anything. The page is here because someone linked to it; treat the figures as anecdotes, and see the full report for this year instead.
When control module (ecm/pcm/bcm) failure gets reported
There are 7 reports of control module (ECM/PCM/BCM) failure on the 2004 Chevrolet Silverado, 6 with a mileage attached. That is too few to place the failure on the odometer with any confidence.
A part like this is normally expected to survive 92,000 miles. It is the 29th most-reported problem on this model year.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| — | — | 41,300 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 9 model years of this car. It shows up earliest on the 2003, at a median of 5,000 miles, and latest on the 2007 at 100,000 miles.
By volume the 1999 carries the most reports, with 62; the 2004 has 7. 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.
Purchased a new 2004 chevrolet silverado z71. The four wheel drive select panel failed. Returned the vehicle to sandy sansing chevrolet pensacola, florida dealer for repair. The service manager stated chevrolet could not fix the problem for two to five months because the problem is a computer software defect. Upon further research the 2000 chevrolet silverado has the same problem. The research and development at chevrolet knew there computer software had a defect when making this vehicle was made available for the consumer. Chevrolet should replace these defective vehicles.*ak
While driving the air bag light came on , and the computer read out, saying servicing air bag. The consumer took vehicle to the dealer, they placed it on the computer and stated it showed no defects, and warranty has expired. *ak *sc
I recently purchased a used 2004 chev. Silverado pick-up in 7-2005 from a car dealer in our area. Within a short time frame from the purchase the air bag light came on for no apparent reason. I took the truck to the dealer where I purchased it and they advised that it would cost approx. $550.00 to replace an sdm module. I have spoken to several mechanics since and they advised that they have seen this same problem with the chev. Silverado pick-ups driver air bag. I believe that this is a safety issue that should be looked into. I believe that they have a defective coil spring in the air bag system which will not allow the steering wheel airbag to operate. Please check and advise. Thanks. *nm
Also reported on the 2004 Chevrolet Silverado
Instrument cluster or gauge failure
Loss of braking
Other brake problem
Other electrical problem
Brake line, hose or caliper failure
Other powertrain problem
How far this goes
This page is kept out of search results because 7 reports is not enough to publish percentiles from. It stays reachable because somebody looking at this exact car would rather see the reports than be told there are none.
Complaints are voluntary, so 7 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 2004 Chevrolet Silverado?
Across 6 owner reports that included an odometer reading, half were filed by 40,000 miles. A quarter were filed before — and a quarter after —. 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 2004 Chevrolet Silverado?
7 reports have been filed with NHTSA, about 0.1 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