Subaru Ascent 2019–2022 — technical service bulletin
Bulletin 16-140-23 · NHTSA communication 10243392 · issued Sep 12, 2023
Technical service bulletin
communication type
Power Train
component
2019–2022
model years
4
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.
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.