Toyota Highlander 2021–2023 — technical service bulletin
Bulletin T-TT-0723-23 · NHTSA communication 10234331 · issued Mar 20, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2021–2023
model years
9
vehicle entries
Official summary
TT: Some 2021 to 2023 MY vehicles equipped Rear Motor Generator, MGR (Q610) may experience an oil leak concern. This issue is currently under investigation
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.