Toyota BZ4X 2023 — technical service bulletin
Bulletin T-TT-0727-23 · NHTSA communication 10234339 · issued Mar 27, 2023
Technical service bulletin
communication type
Electrical System
component
2023
model years
1
vehicle entries
Official summary
TT: MIL On with DTC P2D384B (Hybrid/EV Battery Pack Heater Performance Over Temperature)
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.