Lexus bulletin L-TT-0347-25
What it saysSome ECUs can set a DTC that is common with other ECUs. NHTSA’s full summary ↓
Lexus filed this with NHTSA as a service bulletin dated Jun 17, 2025, received Jul 10, 2025, about the engine. It names 15 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 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 |
|---|---|---|---|---|
| L-TT-0347-25 | Service bulletin | Jun 17, 2025 | 11020663 |
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 themAlso filed against model years this site has no page for: 2024 Lexus NON-Existant UX.
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 14 model years this bulletin names have filed 305 complaints with NHTSA since 2015. 24 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.
When we purchased this car in June 2024 it did not have an engine revving issue. The engine, electrical or transmission maybe all of them have SERIOUS SAFETY ISSUES! When driving and you let off the gas pedal the engine starts revving very loudly, it scares the heck out of you because you don't know if you can stop!
2024 Lexus RX · Engine · filed with NHTSA Sep 3, 2025 · ODI 11684648
The contact owns a 2023 Lexus NX 250. The contact stated that while driving at various highway speeds, the vehicle suddenly decelerated. During the failure, there was no warning light illuminated or messages displayed. The cause of the failure was not yet determined. The local dealer was notified of the failure.
2023 Lexus NX · Engine · filed with NHTSA Aug 7, 2026 · ODI 11755435
On our 2025 Lexus TX350, less than 1 year old, and under normal driving conditions, our AC stopped working suddenly. Upon inspection at the dealership, they determined a rock or road debris came through the front grill and impacted the condenser, which caused a major refrigerant leak and ac to stop working.
2025 Lexus TX · Engine · filed with NHTSA Jun 22, 2026 · ODI 11745699
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 group36 other manufacturer communications filed against these Lexus models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Lexus list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| L-SB-0040-20 OBSOLETE | Service bulletin | Sep 22, 2026 | OBSOLETE NOTICE September 22, 2026: This bulletin is now obsolete. Please see L-SB-0026-26 |
| L-SB-0026-26 | Service bulletin | Sep 22, 2026 | This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries. This bull… |
| L-SB-0020-26 REV1 | Service bulletin | Sep 11, 2026 | Some 2026 model year RZ 350e, RZ 450e, and RZ 550e vehicles may exhibit the Diagnostic Trouble Code (DTC) U25521F associated with the level… |
| L-TT-0350-26 | Service bulletin | Jul 22, 2026 | State of Health (SOH): An estimate of battery health that is updated as the vehicle learns from operating and charging conditions over time.… |
| L-SB-0020-26 | Service bulletin | Jul 13, 2026 | Some 2026 model year RZ 350e, RZ 450e, and RZ 550e vehicles may exhibit the Diagnostic Trouble Code (DTC) U255221F associated with the level… |
| L-SB-0012-26 | Service bulletin | May 11, 2026 | Some 2023 — 2025 model year RX 350h customers may experience a high engine RPM/noise when coasting or braking when going downhill with high… |
| L-SB-0010-26 | Service bulletin | Apr 24, 2026 | Some customers of 2023 – 2025 model year RX 350h, RX 500h, and 2024 – 2025 model year TX 500h vehicles may experience one or more of the fol… |
| L-SB-0021-25 | Service bulletin | Mar 10, 2026 | OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete. |
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 L-TT-0347-25 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 L-TT-0347-25 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 L-TT-0347-25 cover?
The manufacturer filed it against 15 model years: 2025 Lexus NX, 2024 Lexus NX, 2023 Lexus NX, 2022 Lexus NX, 2025 Lexus RX, 2024 Lexus RX and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.