Toyota Supra 2021 — technical service bulletin
Bulletin 21TC02_Region_Le · NHTSA communication 10203541 · issued Oct 6, 2021
Technical service bulletin
communication type
Electrical System
component
2021
model years
1
vehicle entries
Official summary
RL: Due to a software error in the battery management system of the 12V battery located under the vehicle?s hood, the engine auto Stop/Start functionality could become deactivated.
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.