Control module (ECM/PCM/BCM) failure on the 2005 Toyota Corolla
When control module (ecm/pcm/bcm) failure gets reported
Owners of the 2005 Toyota Corolla report control module (ECM/PCM/BCM) failure at a median of 100,000 miles. A quarter of the reports come in before 65,000 miles and a quarter after 115,000 miles, from 50 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 2nd most-reported problem on this model year.
The mileage distribution
The reported range runs from 52,500 miles at the tenth percentile to 150,000 miles at the ninetieth, a spread of 98,666 miles across the middle 80% of reports.
When the reports scatter this far, the mileage is telling you about how these cars were driven more than about the part itself.
6% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 51,734 miles | 64,354 miles | 100,500 miles | 115,000 miles | 150,400 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 12 model years of this car. It shows up earliest on the 2010, at a median of 5,000 miles, and latest on the 2013 at 190,000 miles.
By volume the 2006 carries the most reports, with 87; the 2005 has 59. 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.
Our 2005 toyota corolla is having major problems shifting (lurching and stuck gears), and the car is now unsafe for us to drive on the road (we are likely to get rear-ended if we continue to drive). We have taken the car to our mechanic and been informed that we have a defective engine control module. This problem is described in toyota's technical service bulletin tc014-06. There is an 8yr/80k mile warranty on this part, but our car has over 100k miles so toyota claims that they have no responsibility to pay for the repair of this defect. However, given the safety concerns with driving the car (and our fear of causing an accident), we have no choice but to fix the defect and believe that toyota should be held responsible for repairing the defect. *tr
Ecu or ECM in 2005 toyota corolla defective, causing various problems, mine was transmission problem ,but my transmission was okay the ecu or ECM was causing the transmission not to shift right,.upon talking to dealership thousands of units replaced and there are several online issues of this part malfunctioning,warranty covers to 80,000 miles but if over that it is a $800.00 repair for a part toyota knows is bad, had part replaced at my expense I,don,t feel the consumer should have to pay for this... *tr
At approximately 105,000 miles my toyota corolla began to develop harsh and jerky automatic gear changes which progressed. At 108,000 the dealer diagnosed this as a faulty engine control module ("computer") based on code p2716. Replacement of the module corrected the problem. I was informed that toyota had a service bulletin dated september 20, 2007 tsb no. Tc014-06 indicating that they were aware of this defect and would cover under warranty to 96 months or 80,000 miles. *tr
Also reported on the 2005 Toyota Corolla
Airbag inflator rupture
Other speed control problem
Other engine problem
Airbag warning light or occupant sensor fault
Air conditioning failure
Other electrical problem
How far this goes
Complaints are voluntary, so 59 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 Toyota Corolla?
Across 50 owner reports that included an odometer reading, half were filed by 100,000 miles. A quarter were filed before 65,000 miles and a quarter after 115,000 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 Toyota Corolla?
59 reports have been filed with NHTSA, about 0.4 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