Lexus GX 2024–2025 — technical service bulletin
Bulletin L-SB-0031-25 · NHTSA communication 11021729 · issued Jul 29, 2025
Technical service bulletin
communication type
Power Train
component
2024–2025
model years
2
vehicle entries
Official 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.
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.