Subaru Ascent 2019–2021 — technical service bulletin
Bulletin 16-140-23 · NHTSA communication 10235310 · issued Apr 26, 2023
Technical service bulletin
communication type
Equipment
component
2019–2021
model years
3
vehicle entries
Official summary
This bulletin announces availability of new reprograming files for the Transmission Control Module (TCM) to address judder a sensation possibly accompanied by a vibration-type sound when accelerating from slow speeds.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.