2021 Subaru Forester power train problems
14 owner complaints filed with NHTSA name the power train on the 2021 Subaru Forester — 7% of all complaints for this model year.
What owners report
“My 2021 Subaru Forester has a recurring, worsening defect in the Idle Stop/Start (ISS) system that creates a stalling hazard. When ISS shuts the engine off at a stop, the engine intermittently fails to restart when I try to move again. It cranks progressively slower, warning lights illuminate, a…”
filed Jul 2, 2026
“The contact owned a 2021 Subaru Forester. The contact stated that while driving at approximately 4 MPH and slowing to park, the vehicle accelerated on its own. The contact stated that the vehicle drove out of the parking lot and crashed into a wall. The contact stated that the air bags deployed and…”
filed Mar 12, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR580 model CVT transmissions used in the models listed.
16-158-26 · Service Bulletin/Repair Instructions · issued Aug 20, 2026This bulletin announces a design change made to the CVT Control Valve Body. The updated valve body incorporates an enhanced valve sleeve to improve durability. This is an revised version of the original bulletin.
16-156-25R · Service Bulletin/Repair Instructions · issued Aug 20, 2026This Service Information Bulletin announces the release of a new diagnostic assistance application for TR690 and TR580 CVT-equipped vehicles. This is an revised version of the original bulletin.
16-154-25R · Service Bulletin/Repair Instructions · issued Aug 20, 2026This Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models…
16-132-20R · Service Bulletin/Repair Instructions · issued Aug 20, 2026
Power Train problems in other Forester years
| Year | Reports | Share |
|---|---|---|
| 2026 Forester | 1 | 5% |
| 2025 Forester | 4 | 4% |
| 2023 Forester | 4 | 5% |
| 2022 Forester | 4 | 4% |
| 2020 Forester | 32 | 5% |
| 2019 Forester | 38 | 5% |
| 2018 Forester | 23 | 5% |
| 2017 Forester | 44 | 8% |
| 2016 Forester | 50 | 12% |
| 2015 Forester | 95 | 15% |
| 2014 Forester | 41 | 10% |
| 2013 Forester | 6 | 8% |
Other reported problem areas on the 2021 Subaru Forester
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.