Toyota Highlander 2021–2023 — technical service bulletin
Bulletin T-TT-0726-23 · NHTSA communication 10234337 · issued Mar 23, 2023
Technical service bulletin
communication type
Back Over Prevention
component
2021–2023
model years
9
vehicle entries
Official summary
TT: Some 2021 - 2023 Highlander HV, RAV4 HV and Sienna HV vehicles equipped with Rear Motor Generator, MGR (Q610), may duplicate an abnormal noise (Drone, Growl, Humming, and/or other) from the MGR at various vehicle speeds and normal drive conditions. Please contact TAS for diagnostic instructions to aid in resolution of the 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.