Control module (ECM/PCM/BCM) failure on the 2015 Hyundai Sonata
When control module (ecm/pcm/bcm) failure gets reported
Owners of the 2015 Hyundai Sonata report control module (ECM/PCM/BCM) failure at a median of 60,000 miles. A quarter of the reports come in before 25,000 miles and a quarter after 125,000 miles, from 12 reports that carried an odometer reading.
A part like this is normally expected to survive 92,000 miles. It is the 22nd 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 105,528 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.
50% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 22,300 miles | 25,000 miles | 59,795 miles | 125,559 miles | 127,828 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 17 model years of this car. It shows up earliest on the 2008, at a median of 5,000 miles, and latest on the 2011 at 117,500 miles.
By volume the 2011 carries the most reports, with 41; the 2015 has 17. 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.
Leased 2015 hyundai sonata se trim in 05/2015. 1) in 02/16 --> sluggish acceleration reported to dealer and he applied software update to ECM. 2) 10/05/2016 ---> while driving car started to sputter , shudder and heavy smoke (mostly white) coming from tail pipe. Car was not accelerating at all. It was very dangerous situation and felt that car was not under control. Finally it came to stop. After few minutes, tried to start and succeeded in 3rd/4th attempt. Took it to nearby hyundai dealer, and as per them, they updated ECM (engine control module) software. 3) 10/20/2016 --> issue appeared again with same symptoms.car is with dealer and he is looking into it. I am very concerned about safety. *tr
I read your complaints and also have had to have my ECM or vcm replaced 3 times. While accelerating my car loses power. Im not able to pass cars or get out of the way quickly if needed. Also not getting the gas mileage I use to get before it broke. Plus I have the sport and am suppose to be able to shift in to sport or eco there is no difference when I press the button. This is happening on freeway at stop signs. Etc..
Car looses power for a few seconds while driving after accelerating. On local road at 35mph and on highway at 65mph. This occurred following a service recall for this issue. Campaign t1h and and campaign 150 vcm inspect or replacement and ECM upgrade. Started happening as a very short incident so I did not realize what was happening. Recently episodes were a few seconds long so I could determine what happened. Multiple times.
Also reported on the 2015 Hyundai Sonata
Other engine problem
Other electrical problem
Excessive oil consumption
Other powertrain problem
Other body or interior problem
Other steering problem
How far this goes
Complaints are voluntary, so 17 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 2015 Hyundai Sonata?
Across 12 owner reports that included an odometer reading, half were filed by 60,000 miles. A quarter were filed before 25,000 miles and a quarter after 125,000 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 2015 Hyundai Sonata?
17 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