Toyota Grand Highlander 2023–2024 — technical service bulletin
Bulletin T-TT-0741-23 · NHTSA communication 10245484 · issued Oct 24, 2023
Technical service bulletin
communication type
Equipment
component
2023–2024
model years
2
vehicle entries
Official summary
TT: Some MY23-24 Highlander and Grand Highlander/HV vehicles may experience a condition where the engine does not restart automatically following a start/stop event. However, the engine may be restarted normally after a period of time in the IG OFF condition. This condition typically sets DTC P154200. 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.