# Service bulletin L\-SB\-0042\-25 Rev2

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: 11033399
- Published by NHTSA: 2026\-06\-04
- Manufacturer's number: L\-SB\-0042\-25 Rev2
- Manufacturer's date: 2026\-05\-05
- Campaign id or software version: L\-SB\-0042\-25 Rev2
- NHTSA component: POWER TRAIN

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033399-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11033399-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2024 to 2025 LEXUS GX

## Other bulletins for the same vehicles and component

- [L\-SB\-0042\-25 Rev1](/bulletins/11029875.md), 2026-03-07, Service bulletin: POWER TRAIN. 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](/bulletins/11024079.md), 2025-10-08, Service bulletin: POWER TRAIN. 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
- [L\-SB\-0031\-25](/bulletins/11021729.md), 2025-08-08, Service bulletin: POWER TRAIN. 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.

JSON: [/v1/bulletins/11033399](/v1/bulletins/11033399)

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