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Service bulletins for the 2020 Toyota Supra

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

75 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: 12-volt battery are shown. Show all

Bulletins, newest first
T-TT-0687-222022-04-18. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TT: When customers have a concern about a discharged battery, no start, or general battery concern, the DCA-8000 is the only appropriate tool to use for diagnosis
T-TT-0553-19 Rev2020-08-24. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TT: The new DCA-8000 Diagnostic Charger may cause your facility?s Ground Fault Circuit Interrupter (GFCI) breaker to trip. A GFCI breaker can be tripped for various reasons, one of the reasons may be related to the DCA-8000. We are investigating this issue to determine the root cause. Other reasons the GFCI breaker may trip ?Circuit demand is too high for GFCI rating ?Worn out GFCI internal contacts ?Improper installation or wiring of GFCI breaker
T-TT-0556-192019-09-16. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TT: When testing the battery during PDS with either the DSS-5000 or DCA-8000 battery diagnostic tools, the battery tester may provide inaccurate results if it is connected to the remote battery posts under the hood.
T-SB-0050-192019-06-24. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TSB: Long-term or off-site storage requires special care to keep vehicles factory fresh and ready for delivery. The following guidelines should be performed to minimize vehicle component/part degradation due to extended vehicle storage conditions. Long-term storage can affect a vehicle?s systems and components. Any problems that are found should be corrected immediately.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.