TSB 15-311-23R — Subaru Service bulletin
15-311-23R is a service bulletin on file with NHTSA for 7 Subaru models, 2023–2026 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. This bulletin provides instruction for use (FOTA) of a new reprogramming procedure to optimize the Denso Gen 4.5 Audio and Navigation system utilized in the models listed. (This is an revised version of the original bulletin).
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 15-311-23R names
| Vehicle | Model years |
|---|---|
| Subaru Ascent | 2023, 2024, 2025, 2026 |
| Subaru Crosstrek | 2024, 2025, 2026 |
| Subaru Forester | 2025, 2026 |
| Subaru Impreza | 2024, 2025, 2026 |
| Subaru Legacy | 2023, 2024, 2025 |
| Subaru Outback | 2023, 2024, 2025, 2026 |
| Subaru WRX | 2024, 2025 |
Every document filed under 15-311-23R
| Document ID | Filed | Type |
|---|---|---|
| 15-311-23R | July 15, 2026 | Service bulletin |
What 15-311-23R covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 15-311-23R?
15-311-23R is a service bulletin filed with NHTSA by Subaru, covering 7 Subaru models across the 2023–2026 model years. NHTSA's summary reads: This bulletin provides instruction for use (FOTA) of a new reprogramming procedure to optimize the Denso Gen 4.5 Audio and Navigation system utilized in the models listed. (This is an revised version of the original bulletin).
Which vehicles does 15-311-23R cover?
NHTSA's file names Subaru Ascent (2023–2026); Subaru Crosstrek (2024–2026); Subaru Forester (2025–2026); Subaru Impreza (2024–2026); Subaru Legacy (2023–2025); Subaru Outback (2023–2026); Subaru WRX (2024–2025). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB 15-311-23R a recall, and is the repair free?
No. 15-311-23R is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of 15-311-23R?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 15-311-23R, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under 15-311-23R. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.