2020 Subaru Ascent fuel/propulsion system problems
14 owner complaints filed with NHTSA name the fuel/propulsion system on the 2020 Subaru Ascent — 4% of all complaints for this model year.
What owners report
“My 2020 Subaru Ascent struggles to retain power when accelerating, especially from stopping and especially when the fuel is low. The vehicle stalls or loses some power when trying to accelerate. The check engine light is not on and there is no other indication that there is a problem with the…”
filed Apr 20, 2026
“Possible Transmission issue. The transmission was replaced in February by University Subaru in Columbia, Missouri. I have made a second appointment as the vehicle is still having the same issue shifting gears or going uphill. During a drive where there was a small incline of 10 degrees when the…”
filed Apr 11, 2024
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and…
09-74-21R · Service Bulletin/Repair Instructions · issued Jun 26, 2026
Fuel/propulsion System problems in other Ascent years
| Year | Reports | Share |
|---|---|---|
| 2024 Ascent | 1 | 2% |
| 2023 Ascent | 1 | 2% |
| 2022 Ascent | 4 | 7% |
| 2021 Ascent | 2 | 2% |
| 2019 Ascent | 16 | 4% |
Other reported problem areas on the 2020 Subaru Ascent
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.