Toyota bulletin T-TT-0766-24
What it saysSome vehicles in the market may require a short block repair, and in certain circumstances, Toyota may request a dealer to repair such vehicles with an Engine Assembly instead. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Oct 15, 2024, received Nov 8, 2024, about the engine. It names 2 model years (2022–2023). 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 vehicles in the market may require a short block repair, and in certain circumstances, Toyota may request a dealer to repair such vehicles with an Engine Assembly instead. Please follow the recommendations below in addition to the steps for Partial Engine replacement in the repair manual when performing engine replacement with Part Number 04004-23370.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| T-TT-0766-24 | Service bulletin | Oct 15, 2024 | 11010344 |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 04004-23370 | — | — | |
| 12281-70080 | OK TO USE | — | eBay Motors → |
| 12282-70050 | OK TO USE | — | eBay Motors → |
| 90105-A0354 | OK TO USE | — | eBay Motors → |
Read by machine from the document NHTSA serves (10 pages), read Sep 30, 2026. A part number is shown only where it matches Toyota’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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 2 model years this bulletin names have filed 848 complaints with NHTSA since 2015. 420 of them name Engine — 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 Tundra, the 38 owners who gave an odometer reading for Engine reported it at a median of 39,660 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
When stopped at an intersection, whether for a stop sign, stop light, or waiting to turn, there are intermittent times when there is a very distinct lag or delay between when the gas pedal is pressed and the vehicle actually starting to move. As I said, this is intermittent and not an 'all the time' occurrence.
2022 Toyota Tundra · Engine · filed with NHTSA Nov 4, 2022 · ODI 11492237
I was in the right lane on the 15 southbound from mesquite heading towards Las Vegas. Got into the passing lane to pass a semi and all power was lost after cutting over. I had to immediately cut over back to the right lane after passing the semi and pull over to the shoulder.
2023 Toyota Tundra · Engine · filed with NHTSA Aug 26, 2023 · ODI 11540860
In depth: 2023 Toyota Tundra engine problems → · 2022 Toyota Tundra engine 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 engine
Source: same model, same component group14 other manufacturer communications filed against the Toyota Tundra under the same component group (engine), newest first. The eight newest are listed; the rest are on the Toyota list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| T-SB-0110-20 OBSOLETE | Service bulletin | Aug 20, 2026 | OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T-SB-0051-26. |
| T-SB-0107-20 REV2 | Service bulletin | Feb 12, 2025 | OBSOLETE NOTICE February 11, 2025: This bulletin is now obsolete. Please see T-SB-0021-25. |
| T-SB-0021-25 | Service bulletin | Feb 10, 2025 | Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for… |
| T-TT-0773-25 | Service bulletin | Feb 6, 2025 | Some 22-25 MY Tundra HV and 23-25 MY Sequoia HV vehicle may exhibit a condition where there is a rattling noise, near the hybrid motor, when… |
| T-TT-0766-24 REV1 | Service bulletin | Dec 10, 2024 | Some vehicles in the market may require a short block repair, and in certain circumstances, Toyota may request a dealer to repair such vehic… |
| T-SB-0110-20 REV2 | Service bulletin | Dec 10, 2024 | This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries. This bull… |
| T-SB-0085-24 | Service bulletin | Sep 30, 2024 | Some 2023 – 2024 model year Sequoia Hybrid and 2022 – 2024 model year Tundra and Tundra Hybrid vehicles may exhibit a MIL ON condition with… |
| T-SB-0103-20 REV1 | Service bulletin | Jun 19, 2024 | This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota ve… |
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-0766-24 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-0766-24 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-0766-24 cover?
The manufacturer filed it against 2 model years: 2023 Toyota Tundra, 2022 Toyota Tundra. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.