Toyota bulletin T-TT-0779-25
What it saysTo assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Apr 2, 2025, received May 15, 2025, about the electrical system — 2 documents under this number. It names 47 model years (2022–2025). 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 communicationTo assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-TT-0779-25 | Service bulletin | Apr 2, 2025 | 11019331 | |
| T-TT-0779-25 | Service bulletin | Apr 2, 2025 | 11018328 |
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 themand 6 more on this site: 2022 Toyota Tundra, 2024 Toyota Venza, 2023 Toyota Venza, 2025 Toyota bZ4X, 2024 Toyota bZ4X, 2023 Toyota bZ4X.
Also filed against model years this site has no page for: 2024 Toyota Redundant Land Cruiser.
A 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 46 model years this bulletin names have filed 4,077 complaints with NHTSA since 2015. 494 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 2023 Toyota RAV4 Prime, the 15 owners who gave an odometer reading for Electrical System reported it at a median of 39,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
I own a 2023 Toyota RAV4 XSE that currently has an active safety recall related to the instrument cluster/speedometer display going blank. My vehicle is experiencing this issue — the speedometer/instrument screen has gone completely blank, preventing me from seeing my speed, warning lights, or critical vehicle information while driving.
2023 Toyota RAV4 Prime · Electrical System · filed with NHTSA Feb 9, 2026 · ODI 11716664
The contact owns a 2024 Toyota Rav4 Prime. The contact received notification of NHTSA Campaign Number: 25V595000 (Electrical System); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
2024 Toyota RAV4 Prime · Electrical System · filed with NHTSA Oct 27, 2026 · ODI 11774036
I was backing up the vechial accelerated the steering wheel was turning rapid & a grinding noise causing me too hit another vechial about a month before my husband was driving & the vechial accelerated going toward also we had had some issues with back camera not doing a warning signal with a object behind vechial when the accident…
2025 Toyota Highlander · Electrical System · filed with NHTSA Jul 31, 2026 · ODI 11753999
In depth: 2023 Toyota Corolla Cross 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 group101 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… |
| T-SB-0050-26 | Over-the-air update | Aug 19, 2026 | A head unit software update (version 8612G42397) is now available for 2026 model year RAV4 Hybrid, and RAV4 Plug-in Hybrid vehicles via OTA… |
| 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… |
| T-TT-0803-26 | Service bulletin | May 21, 2026 | Some 26MY RAV4 HV/PHV vehicles with HU (head unit) versions 1136 or older may exhibit one or more of theintermittent conditions below: • No… |
| T-TT-0800-26 | Service bulletin | May 20, 2026 | Some 2026 RAV4 HV vehicles may display a Distance to Empty (DTE) that is higher than expected at initial fill-up. The DTE is computed using… |
| 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-0029-26 | Over-the-air update | Apr 24, 2026 | A new head unit software update is available for 2023 – 2024 model year RAV4, RAV4 Hybrid, and RAV4 Prime vehicles equipped with Toyota Mult… |
| 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… |
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-0779-25 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-0779-25 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-0779-25 cover?
The manufacturer filed it against 47 model years: 2025 Toyota 4Runner, 2025 Toyota Camry, 2025 Toyota Corolla, 2024 Toyota Corolla, 2023 Toyota Corolla, 2025 Toyota Corolla Cross and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.