Service bulletin L-SB-0031-25
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
| Type | Service bulletin |
|---|---|
| NHTSA id | 11021729 |
| Published by NHTSA | 2025-08-08 |
| Manufacturer's number | L-SB-0031-25 |
| Manufacturer's date | 2025-07-29 |
| Campaign id or software version | L-SB-0031-25 |
| NHTSA component | POWER TRAIN |
NHTSA's summary
Some 2024-2025 model year GX550 vehicles may exhibit a harsh downshift when slowing to a stop. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to address these conditions.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Transmission and driveline
| LEXUS GX | 2024, 2025 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| L-SB-0042-25 Rev2 | 2026-06-04. Service bulletin. Some 2024 – 2025 model year GX 550 vehicles may exhibit a harsh downshift (2 – 1) when slowing to a stop. The Electronic Controlled Transmission (ECT) ECU logic has been modified to address this condition. |
|---|---|
| L-SB-0042-25 Rev1 | 2026-03-07. Service bulletin. Some 2024 – 2025 model year GX 550 vehicles may exhibit a harsh downshift (2 – 1) when slowing to a stop. The Electronic Controlled Transmission (ECT) ECU logic has been modified to address this condition. |
| L-SB-0042-25 | 2025-10-08. Service bulletin. Some 2024 – 2025 model year GX 550 vehicles may exhibit a harsh downshift (2 – 1) when slowing to a stop. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to address this condition |