Lexus bulletin LTT032823
What it saysTT: Some 2023MY RX500h 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 ↓
Lexus filed this with NHTSA as a service bulletin dated Dec 12, 2023, received Jan 29, 2024, about the power train. 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 RX500h 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 |
|---|---|---|---|---|
| LTT032823 | Service bulletin | Dec 12, 2023 | 10249317 | 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 66 complaints with NHTSA since 2015. 23 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 called on behalf of his mother who owns a 2023 Lexus RX500H. The contact stated while his mother was reversing, the vehicle shuddered abnormally. The contact stated that while his mother was depressing the accelerator pedal, the vehicle failed to accelerate as intended.
2023 Lexus RX · Power Train · filed with NHTSA Jul 10, 2025 · ODI 11672534
On at least 7 occasions the driver was TRAPPED inside the vehicle. The car failed to start and the doors and windows locked. If the driver had not had a cell phone to make an emergency call he would have been locked inside until someone discovered the problem.
2023 Lexus RX · Electrical System · filed with NHTSA Dec 26, 2025 · ODI 11707085
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 power train
Source: same model, same component group9 other manufacturer communications filed against the Lexus RX under the same component group (power train), newest first. The eight newest are listed; the rest are on the Lexus list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| L-SB-0033-24 REV2 | Service bulletin | Jun 12, 2026 | Some 2023 – 2024 model year RX 350, RX 350h, RX 500h, and 2024 model year TX 350 and TX 500h vehicles may exhibit a rotational clicking nois… |
| L-SB-0017-25 REV2 | Service bulletin | Apr 17, 2026 | Some 2022 – 2024 model year NX 250 and NX 350, and 2023 – 2024 model year RX 350 vehicles may exhibit both of the following conditions at ve… |
| L-SB-0009-26 | Service bulletin | Apr 16, 2026 | Some 2022 – 2024 model year NX 250 and NX 350, and 2023 – 2024 model year RX 350 vehiclesmay exhibit the following condition at vehicle star… |
| L-SB-0033-24 | Service bulletin | Jun 6, 2025 | Some 2023 – 2024 model year RX 350, RX 350h, RX 500h, and 2024 model year TX 350 and TX 500h vehicles may exhibit a rotational clicking nois… |
| L-SB-0018-25 | Service bulletin | Feb 24, 2025 | Some 2023 – 2024 RX 500h and 2024 – 2025 TX 500h vehicles may exhibit a shudder sensation when the vehicle is at a complete stop, the State… |
| L-SB-0017-25 | Service bulletin | Feb 20, 2025 | Some 2022 – 2024 model year NX 250 and NX 350, and 2023 – 2024 model year RX 350 vehicles may exhibit both of the following conditions at ve… |
| L-SB-0028-24 | Service bulletin | Jun 4, 2024 | Some 2023 – 2024 model year RX 500h and 2024 model year TX 500h vehicles may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P… |
| L-TT-0328-23 Rev | Service bulletin | Mar 12, 2024 | TT: Some 2023MY RX500h may require a transaxle and transmission control module (TCU) replacement for low-speed vibration from Transaxle and/… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Lexus, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Lexus LTT032823 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 LTT032823 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 LTT032823 cover?
The manufacturer filed it against 1 model year: 2023 Lexus RX. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.