Subaru Ascent 2023–2025 — technical service bulletin
Bulletin 15-305-22R · NHTSA communication 11024853 · issued Oct 16, 2025
Technical service bulletin
communication type
Electrical System
component
2023–2025
model years
15
vehicle entries
Official summary
This bulletin announces reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4.5 Denso CP1.5 Audio and Navigation head units utilized in the models listed.
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.