Lexus bulletin L-TT-0348-25
What it saysCustomers state Parking Brake efficiency concerns. NHTSA’s full summary ↓
Lexus filed this with NHTSA as a service bulletin dated Aug 15, 2025, received Sep 9, 2025, about the service brakes. It names 4 model years (2020–2023). 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.
Get the next Lexus GX bulletin by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationCustomers state Parking Brake efficiency concerns. The conditions can include the following: • The PKB Pedal feels loose or requires full depression for proper engagement. • Ineffective on steep surfaces, allowing the vehicle to roll with transmission in Neutral. • Ineffective on steep surfaces, allowing the vehicle to roll slightly with transmission in Park. [Transmission Dependency]
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| L-TT-0348-25 | Service bulletin | Aug 15, 2025 | 11022957 |
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.
Email me new Lexus bulletins for the GX
A weekly email, sent only in a week when Lexus files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 4 model years this bulletin names have filed 22 complaints with NHTSA since 2015. 8 of them name Service Brakes — 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.
I bought this 2023 GX460 new in October 2023 from Lexus of Towson in Towson, MD. It currently has approximately 3100 miles on it. Since owning it I have noticed that when coming to a stop and sitting still with the vehicle in gear and the brake pedal engaged normally that the vehicle will start to move on it's own causing more pressure…
2023 Lexus GX · Service Brakes · filed with NHTSA Mar 19, 2024 · ODI 11578320
I was traveling east bound on 161/16/37 near Raccoon Valley Golf Course in Granville OH. I was near MM 104. It was approximately 8:13PM and the road conditions were clear. No other vehicles were in front of or behind me. I heard a screech, the wheel jerked out of my hand to the left, and the wipers came on.
2022 Lexus GX · Service Brakes · filed with NHTSA Sep 11, 2023 · ODI 11543837
While driving my 2022 Lexus GX460, I experienced a sudden and unexpected loss of braking capability while stopped. After bringing the vehicle to a complete stop, the brake pedal pressure gradually decreased while my foot remained firmly on the brake.
2022 Lexus GX · Service Brakes · filed with NHTSA Jan 18, 2026 · ODI 11711785
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 service brakes
Source: same model, same component group6 other manufacturer communications filed against the Lexus GX under the same component group (service brakes), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| L-SB-0053-25 REV2 | Service bulletin | Jul 1, 2026 | Some 2022 – 2026 model year LX 600, 2024 – 2026 model year GX 550, and 2025 – 2026 model year LX 700h vehicles may exhibit a condition where… |
| L-SB-0053-25 | Service bulletin | Feb 21, 2026 | Some 2024 – 2026 model year GX 550, 2022 – 2026 model year LX 600, and 2025 – 2026 model year LX 700h vehicles may exhibit a condition where… |
| L-TT-0348-25 REV1 | Service bulletin | Jan 30, 2026 | Customers state Parking Brake efficiency concerns. The conditions can include the following: • The Parking Brake Pedal feels loose or requir… |
| L-SB-0036-24 OBSOLETE | Service bulletin | Nov 21, 2025 | OBSOLETE NOTICE November 21, 2025: This bulletin is now obsolete. Please see L-SB-0053-25 |
| L-SB-0036-24 REV1 | Service bulletin | Feb 10, 2025 | Some 2024 – 2025 model year GX 550 and 2022 – 2025 model year LX 600 vehicles may exhibit a condition where the front brakes produce a squea… |
| L-SB-0036-24 | Service bulletin | Oct 8, 2024 | Some 2024 model year GX 550 and 2022 – 2024 model year LX 600 vehicles may exhibit a condition where the front brakes produce a squealing no… |
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-0348-25 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-0348-25 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-0348-25 cover?
The manufacturer filed it against 4 model years: 2023 Lexus GX, 2022 Lexus GX, 2021 Lexus GX, 2020 Lexus GX. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.