2015 Subaru Legacy engine problems
23 owner complaints filed with NHTSA name the engine on the 2015 Subaru Legacy — 14% of all complaints for this model year.
What owners report
“I am reporting a Sudden Unintended Deceleration event in my Subaru. The vehicle grinded to a halt without driver input. The car stopped in the left lane of a major highway. We put on our hazards and called the state police for help. They were unable to get to us in time. We were hit from the rear…”
filed Feb 27, 2026
“Incident ~ 5:40 pm, Geneva NY Weather ~ 10 F, not snowing. Background. On or shortly after being started, the vehicle had exhibited prior incidents of extremely rapid engine acceleration not initiated by the operator. Most recently the day before. The incident: I was in the process of very slowly…”
filed Jan 31, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This bulletin announces the availability of reprogramming files for the Engine Control Module (ECM) for certain vehicles equipped with 3.6L engines.
02-195-26 · Service Bulletin/Repair Instructions · issued Jun 1, 2026
Engine problems in other Legacy years
| Year | Reports | Share |
|---|---|---|
| 2022 Legacy | 1 | 3% |
| 2021 Legacy | 2 | 6% |
| 2020 Legacy | 4 | 3% |
| 2019 Legacy | 6 | 5% |
| 2018 Legacy | 10 | 9% |
| 2017 Legacy | 5 | 4% |
| 2016 Legacy | 7 | 5% |
| 2014 Legacy | 5 | 9% |
| 2013 Legacy | 18 | 27% |
| 2012 Legacy | 23 | 26% |
| 2011 Legacy | 22 | 13% |
| 2010 Legacy | 31 | 21% |
Other reported problem areas on the 2015 Subaru Legacy
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.