Toyota Highlander 2017–2019 — technical service bulletin
Bulletin T-TT-0523-19_Rev · NHTSA communication 10163727 · issued Jul 30, 2019
Technical service bulletin
communication type
Engine
component
2017–2019
model years
3
vehicle entries
Official summary
TT: Some 2017, 2018 and 2019 model year Highlanders are equipped with an engine Stop & Start system. It is important to use part number 28800-31550 when Stop & Start equipped Highlanders need battery replacement. There is no recommended Truestart battery that is applicable for Stop & Start Highlanders. The Stop & Start equipped battery is specially designed for deep discharges, and it is of a design called enhanced flooded battery (EFB). Characteristics of EFB type batteries are the ability to quickly discharge, and recharge.
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.