Toyota bulletin TTT074023A
What it saysTT: Some 2023MY Crown Platinum grade ONLY may require a transaxle and transmission control module (TCU) replacement for low-speed vibration from Transaxle and/or DTC for P084000/P084087. NHTSA’s full summary ↓
Toyota filed this with NHTSA as a service bulletin dated Dec 20, 2024, received Jan 29, 2024, about the electrical system. It names 1 model year (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 communicationTT: Some 2023MY Crown Platinum grade ONLY may require a transaxle and transmission control module (TCU) replacement for low-speed vibration from Transaxle and/or DTC for P084000/P084087.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| TTT074023A | Service bulletin | Dec 20, 2024 | 10249330 | not found |
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 1 model year this bulletin names have filed 20 complaints with NHTSA since 2015. 10 of them name Power Train, 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.
The contact owns a 2023 Toyota Crown. The contact stated that the instrument panel screen had turned blank. The contact received the recall notification of NHTSA Campaign Number: 25V595000(Electrical System). The vehicle was taken to the local dealer, who confirmed that the recall remedy parts were not available.
2023 Toyota Crown · Electrical System · filed with NHTSA Dec 31, 2025 · ODI 11708080
When driving the vehicle under normal load and conditions, after coming to a complete stop- then trying to accelerate to take a turn or move forward- the vehicle begins to proceed then suddenly stops moving or accelerating. Twice now I have almost been T Boned.
2023 Toyota Crown · Power Train · filed with NHTSA Jul 3, 2026 · ODI 11748119
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 group31 other manufacturer communications filed against the Toyota Crown 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 |
|---|---|---|---|
| 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… |
| 25TD01 | Service campaign | Sep 25, 2025 | The subject vehicles are equipped with a rear motor unit and an HV Floor Under Wire that provide high voltage to operate the motor. Mud, wat… |
| T-SB-0058-23 REV1 | Service campaign | Jun 13, 2025 | The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The… |
| T-TT-0779-25 | Service bulletin | Apr 2, 2025 | To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. T… |
| T-SB-0013-24 REV1 | Service bulletin | Feb 10, 2025 | The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is… |
| T-SB-0120-20 REV2 | Service bulletin | Jan 30, 2025 | OBSOLETE NOTICE January 30, 2025: This bulletin is now obsolete. Please see T-SB-0015-25. |
| T-SB-0015-25 | Service bulletin | Jan 29, 2025 | Some 2021 – 2025 model year Toyota vehicles may require the download and installation of vehicle specific software or configuration software… |
| T-SB-0111-20 REV2 | Service bulletin | Jan 23, 2025 | OBSOLETE NOTICE January 23, 2025: This bulletin is now obsolete. Please see T-SB-0011-25. |
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 TTT074023A 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 TTT074023A 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 TTT074023A cover?
The manufacturer filed it against 1 model year: 2023 Toyota Crown. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.