Toyota Supra 2020–2022 — technical service bulletin
Bulletin T-TT-0648-21 Rev · NHTSA communication 10220232 · issued Aug 15, 2022
Technical service bulletin
communication type
Electrical System
component
2020–2022
model years
3
vehicle entries
Official summary
TT: When testing the battery during PDS with either the DSS-5000 or DCA-8000 battery diagnostic tools, the DCA/DSS battery tester may provide inaccurate results if it is connected to the remote battery posts under the hood.
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.