Subaru Ascent 2023–2026 — technical service bulletin
Bulletin 15-305-22R · NHTSA communication 11036803 · issued Aug 20, 2026
Technical service bulletin
communication type
Electrical System
component
2023–2026
model years
21
vehicle entries
Official summary
This bulletin announces a 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. This is an revised version of the original bulletin.
Vehicles covered
- 2023 Subaru Ascent
- 2024 Subaru Ascent
- 2025 Subaru Ascent
- 2026 Subaru Ascent
- 2024 Subaru Crosstrek
- 2025 Subaru Crosstrek
- 2026 Subaru Crosstrek
- 2025 Subaru Forester
- 2026 Subaru Forester
- 2024 Subaru Impreza
- 2025 Subaru Impreza
- 2026 Subaru Impreza
- 2023 Subaru Legacy
- 2024 Subaru Legacy
- 2025 Subaru Legacy
- 2023 Subaru Outback
- 2024 Subaru Outback
- 2025 Subaru Outback
- 2024 Subaru WRX
- 2025 Subaru WRX
- 2026 Subaru WRX
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.