Lexus GX 2024–2025 — technical service bulletin
Bulletin L-SB-0042-25 Rev2 · NHTSA communication 11033399 · issued May 5, 2026
Technical service bulletin
communication type
Power Train
component
2024–2025
model years
2
vehicle entries
Official 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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.