Toyota bulletin T-TT-0784-25 REV1
Toyota filed this with NHTSA as a service bulletin dated Jun 17, 2025, received Jul 10, 2025, about the engine — 1 document under this number: T-TT-0784-25 Rev1. It names 49 model years (2017–2025). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationSome ECUs can set a DTC that is common with other ECUs. This can lead to accidental use of the wrong repair manual when diagnosing these type of DTCs.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-TT-0784-25 Rev1 | Service bulletin | Jun 17, 2025 | 11020664 | not yet checked |
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 9 more model years on this site.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Toyota T-TT-0784-25 REV1 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-0784-25 REV1 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.
Which vehicles does T-TT-0784-25 REV1 cover?
The manufacturer filed it against 49 model years: 2022 Toyota Avalon, 2021 Toyota Avalon, 2020 Toyota Avalon, 2019 Toyota Avalon, 2025 Toyota Camry, 2024 Toyota Camry and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.