Control module (ECM/PCM/BCM) failure on the 2005 Cadillac Cts
When control module (ecm/pcm/bcm) failure gets reported
Owners of the 2005 Cadillac Cts report control module (ECM/PCM/BCM) failure at a median of 60,000 miles. A quarter of the reports come in before 30,000 miles and a quarter after 90,000 miles, from 19 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 4th most-reported problem on this model year.
The mileage distribution
The reported range runs from 20,000 miles at the tenth percentile to 130,000 miles at the ninetieth, a spread of 109,477 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.
32% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 19,123 miles | 31,152 miles | 59,844 miles | 92,117 miles | 128,600 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 7 model years of this car. It shows up earliest on the 2004, at a median of 5,000 miles, and latest on the 2003 at 80,000 miles.
By volume the 2006 carries the most reports, with 26; the 2005 has 19. 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.
05 cadillac cts 2.8l traveling at about 55/60 miles per hour...car pulled in front of me cut me off. To avoid collision, I slammed on brakes and car died. I called dealer immediately and advised, asking was this some kind of special feature, dealer advised car not designed to do such and asked me about quantity of gas I had in the vehicle. I advised 1/4 tank and dealer explained by slamming on my brakes all gas ran to front of tank leaving air pocket causing car to die....also after just purchasing the car, sitting at red light and the whole car shook and motor revved up high rpms and died...both times the vehicle did start back up.. Nothing has been done to correct due to dealer advised the vehicle must do the same thing to them. I am fully aware recall is it out for this exact problem, but I have not been notified of the recall and unable to get any cooperation from dealerships regarding the above problem....the recall advised must keep 1/4 tank of gas or more in vehicle at all times to avoid engine failure, also states will have to reprogram the ECM (electronic control module) with new software. *jb
Tl*the contact owns a 2005 cadillac cts. The contact stated that the ECM (engine control module) failed three times. Two of those times, the dealer performed repairs. While driving 50 MPH, the tire flattened. Cadillac refused to come out and make the repair. The contact stated that the failure was supposed to be covered under warranty. Another issue was that the low tire pressure system failed to indicate when the pressure was low. The contact was concerned that the winter weather conditions could cause the failures to worsen. The powertrain was unknown. The current mileage was 17,000 and failure mileage was 3,615.
Tl*the contact owns a 2005 cadillac cts. The contact stated that the ECM (engine control module) failed three times. Two of those times, the dealer performed repairs. While driving 50 MPH, the tire flattened. Cadillac refused to come out and make the repair. The contact stated that the failure was supposed to be covered under warranty. Another issue was that the low tire pressure system failed to indicate when the pressure was low. The contact was concerned that the winter weather conditions could cause the failures to worsen. The powertrain was unknown. The current mileage was 17,000 and failure mileage was 3,615.
Also reported on the 2005 Cadillac Cts
Differential or transfer case failure
Other brake problem
Other powertrain problem
Other electrical problem
Other engine problem
Airbag warning light or occupant sensor fault
How far this goes
Complaints are voluntary, so 19 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 Cadillac Cts?
Across 19 owner reports that included an odometer reading, half were filed by 60,000 miles. A quarter were filed before 30,000 miles and a quarter after 90,000 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 Cadillac Cts?
19 reports have been filed with NHTSA, about 0.5 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