Control module (ECM/PCM/BCM) failure on the 2003 BMW 325CI
Only 3 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 3 reports of control module (ECM/PCM/BCM) failure on the 2003 BMW 325CI, 3 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 3rd most-reported problem on this model year.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| — | — | 12,000 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
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.
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
There is a problem with the electronic throttle/engine management control module. Whenever accelerating from a stop, the car lunges forward, then stops and goes into a cycle where it does this "bucking" action a few times. The car is 2 years old, but has only done this for the past year. I've attempted to have this repaired by bmw- have been working with them for the last eight (8) months with no result. My family refuses to ride in the car because the jerking motion makes them sick. A bmw field representative knows about the problem but refused to diagnose or repair the problem. I hired an independent mechanic that was able to trace the problem to the electronic throttle control, but does not possess the bmw software or equipment to repair it. Now it has become more and more dangerous to drive because the problem is getting progressively worse. It's is difficult to make left turns at intersections since the car jerks forward and stops. A few times I was almost hit by oncoming traffic due to this.
There is a problem with the electronic throttle/engine management control module. Whenever accelerating from a stop, the car lunges forward, then stops and goes into a cycle where it does this "bucking" action a few times. The car is 2 years old, but has only done this for the past year. I've attempted to have this repaired by bmw- have been working with them for the last eight (8) months with no result. My family refuses to ride in the car because the jerking motion makes them sick. A bmw field representative knows about the problem but refused to diagnose or repair the problem. I hired an independent mechanic that was able to trace the problem to the electronic throttle control, but does not possess the bmw software or equipment to repair it. Now it has become more and more dangerous to drive because the problem is getting progressively worse. It's is difficult to make left turns at intersections since the car jerks forward and stops. A few times I was almost hit by oncoming traffic due to this.
When inside, all doors of the vehicle would not open with either the handles, the internal lock/unlock button, or the unlocking mechanism on the key fob. Stopping and starting the vehicle and moving it a few yards stopped the problem. This happened a second time and the bmw dealer diagnosed it as a faulty control module. They did not consider this a safety hazard despite the fact that it would prevent exiting the car in case of emergency. *tr
Also reported on the 2003 BMW 325CI
Other electrical problem
Airbag inflator rupture
Other engine problem
Ignition switch, key fob or immobilizer failure
Other body or interior problem
Stalling while driving
How far this goes
This page is kept out of search results because 3 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 3 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 2003 BMW 325CI?
Across 3 owner reports that included an odometer reading, half were filed by 10,000 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 2003 BMW 325CI?
3 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