Toyota bulletin T-TT-0790-25
What it saysSome customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Aug 20, 2025, received Sep 9, 2025, about the electrical system. It names 32 model years (2016–2019). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationSome 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.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-TT-0790-25 | Service bulletin | Aug 20, 2025 | 11022964 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 32 model years this bulletin names have filed 3,508 complaints with NHTSA since 2015. 396 of them name Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2016 Toyota Tacoma, the 24 owners who gave an odometer reading for Electrical System reported it at a median of 36,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I purchased a new 2016 Prius four on february 16, 2016. The literature on the Toyota factory website says my Prius is equipped to switch from english to metric units. Unfortunately, Toyota failed to disclose that any Prius manufactured in january and february and delivered to the united states did not have this feature working correctly.
2016 Toyota Prius · Electrical System · filed with NHTSA Dec 25, 2016 · ODI 10937393
The pcs always come on the truck died when I was driving it also whent into limp mode on the highway couldn't drive over 20 MPH the truck slammed on the breake when I was driving it into a tunnel in seattle wa almost caused a big accident if there was a semi truck some one would have died the selling dealer lied to me on what's going on…
2018 Toyota Tundra · Electrical System · filed with NHTSA May 31, 2018 · ODI 11099020
I experienced issues right after buying car new. Car unable to read sid card, gsp not working, multi-media screen white wash (white) and unable to read, keeps trying to restart 'bluetooth', auto wiper system does not work, seat belt warning system does not always work, forward collision button on steering work does not work, blind spot…
2017 Toyota Highlander · Electrical System · filed with NHTSA Apr 9, 2017 · ODI 10971485
In depth: 2019 Toyota Highlander electrical problems →
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group74 other manufacturer communications filed against these Toyota models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Toyota list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26TC01 | Service campaign | Sep 8, 2026 | An electrical connection for the rear window defogger may not have been installed correctly during vehicle assembly. Overtime, this can caus… |
| 26TC02 | Service campaign | Jun 25, 2026 | After calibrating a trailer and using the Trailer Backup Guide feature, subsequent use of this feature may result in a “Trailer not detected… |
| 22TE09 | Warranty extension | May 14, 2026 | Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36… |
| T-SB-0021-26 | Service bulletin | Mar 18, 2026 | Some 2020 – 2024 model year Highlander and Highlander Hybrid vehicles may exhibit a condition in which the air conditioner does not cool due… |
| T-SB-0016-26 | Service bulletin | Feb 26, 2026 | Some 2024 – 2026 model year Tacoma vehicles may exhibit a “chirp” noise from the HVAC magnetic clutch upon engagement. |
| T-SB-0106-22 OBSOLETE | Service bulletin | Jan 30, 2026 | OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26. |
| T-SB-0001-26 | Service bulletin | Jan 28, 2026 | Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool… |
| T-SB-0083-25 | Service bulletin | Nov 7, 2025 | A new head unit software update is available for 2022 – 2025 model year Tundra, and Tundra Hybrid; 2023 – 2025 model year Corolla Cross, Cor… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Toyota, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Toyota T-TT-0790-25 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the T-TT-0790-25 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Toyota warranty extension on file lists the ones Toyota has filed.
Which vehicles does T-TT-0790-25 cover?
The manufacturer filed it against 32 model years: 2019 Toyota 4Runner, 2018 Toyota 4Runner, 2017 Toyota 4Runner, 2018 Toyota Avalon, 2017 Toyota Avalon, 2019 Toyota Highlander and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.