TSB T-TT-0790-25 — Toyota Service bulletin
T-TT-0790-25 is a service bulletin on file with NHTSA for 9 Toyota models, 2016–2019 model years. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low.
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years T-TT-0790-25 names
| Vehicle | Model years |
|---|---|
| Toyota 4Runner | 2017, 2018, 2019 |
| Toyota Avalon | 2017, 2018 |
| Toyota Highlander | 2016, 2017, 2018, 2019 |
| Toyota Prius | 2016, 2017, 2018, 2019 |
| Toyota Sequoia | 2016, 2017, 2018, 2019 |
| Toyota Sienna | 2016, 2017, 2018, 2019 |
| Toyota Tacoma | 2016, 2017, 2018, 2019 |
| Toyota Tundra | 2016, 2017, 2018, 2019 |
| Toyota Yaris | 2018 |
Every document filed under T-TT-0790-25
| Document ID | Filed | Type |
|---|---|---|
| T-TT-0790-25 | August 20, 2025 | Service bulletin |
What T-TT-0790-25 covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB T-TT-0790-25?
T-TT-0790-25 is a service bulletin filed with NHTSA by Toyota, covering 9 Toyota models across the 2016–2019 model years. NHTSA's summary reads: Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low.
Which vehicles does T-TT-0790-25 cover?
NHTSA's file names Toyota 4Runner (2017–2019); Toyota Avalon (2017–2018); Toyota Highlander (2016–2019); Toyota Prius (2016–2019); Toyota Sequoia (2016–2019); Toyota Sienna (2016–2019); Toyota Tacoma (2016–2019); Toyota Tundra (2016–2019); Toyota Yaris (2018). 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 T-TT-0790-25 a recall, and is the repair free?
No. T-TT-0790-25 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 T-TT-0790-25?
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 T-TT-0790-25, 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 T-TT-0790-25. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.