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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: Electrical system are shown. Show all

Bulletins, newest first
24TD042024-09-07. Service bulletin. ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR LIMITED-SERVICE CAMPAIGN 24TD04 DATA COMUNICATION MODULE (DCM) UPDATE CERTAIN 2020 - 2023 SUPRA
24TD042024-09-07. Service campaign. ELECTRICAL SYSTEM. Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
24TD042024-09-07. Service campaign. ELECTRICAL SYSTEM. Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
24TD042024-08-08. Service bulletin. ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR LIMITED-SERVICE CAMPAIGN 24TD04 DATA COMUNICATION MODULE (DCM) UPDATE CERTAIN 2020 - 2023 SUPRA
24TD042024-08-08. Service campaign. ELECTRICAL SYSTEM. Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
24TD042024-08-08. Service campaign. ELECTRICAL SYSTEM. Due to incorrect software in the Data Communication Module (DCM) in your vehicle, the DCM cannot connect to the 4G cellular service. Therefore, after the 3G cellular service was sunset, voice communication with service providers when using connected services like Emergency call and Roadside assistance, is not available.
T-TT-0754-242024-07-06. Service bulletin. ELECTRICAL SYSTEM. Customers have expressed concerns about the performance of Qi Wireless Chargers. Wireless chargers on applicable vehicles are designed to work with Qi Certified devices only. MagSafe devices, that are not Qi Certified, may not charge as expected with Qi Wireless Chargers.
T-SB-0002-20 Rev12024-07-06. Service bulletin. ELECTRICAL SYSTEM. Some 2020 – 2024 model year Supra vehicles equipped with navigation require a new process for updating map data. This procedure is unique to Supra and is available to customers at any time during their map update service period. Updated map data is released periodically, and there is no activation key/code required to update the vehicle map during the valid map update period. REVISION NOTICE April 09, 2024 Rev1: •Applicability has been updated to include 2021 – 2024 model year Supra vehicles.
T-TT-0754-242024-07-06. Service bulletin. ELECTRICAL SYSTEM. Customers have expressed concerns about the performance of Qi Wireless Chargers. Wireless chargers on applicable vehicles are designed to work with Qi Certified devices only. MagSafe devices, that are not Qi Certified, may not charge as expected with Qi Wireless Chargers.
T-SB-0002-20 Rev12024-07-06. Service bulletin. ELECTRICAL SYSTEM. Some 2020 – 2024 model year Supra vehicles equipped with navigation require a new process for updating map data. This procedure is unique to Supra and is available to customers at any time during their map update service period. Updated map data is released periodically, and there is no activation key/code required to update the vehicle map during the valid map update period. REVISION NOTICE April 09, 2024 Rev1: •Applicability has been updated to include 2021 – 2024 model year Supra vehicles.
T-TT-0648-21 Rev2022-09-15. Service bulletin. ELECTRICAL SYSTEM. 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.
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-SB-0011-212021-03-15. Service bulletin. ELECTRICAL SYSTEM. TSB: This Service Bulletin provides parts information and repair procedures for wire harnesses, wire terminals, and connectors for 2020-2021 model year Supra vehicles.
T-TT-0578-19 Rev2020-11-23. Service bulletin. STEERING; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. TT: Some customers may encounter Bluetooth® connectivity concerns such as: ?Difficulty to pair the phone. ?Intermittent Bluetooth® failure to connect to the vehicle when first turning on the vehicle. ?Various Bluetooth® Audio functions are no longer functioning with customer?s phone such as ability to change the track using the steering wheel controls. These concerns can be caused by changes made on the customer?s phone. Make sure to inquire with the customer if the connectivity concerns occurred after receiving an operating system update on their phone, or if they have restored their phone data/settings recently.
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-SB-0151-192019-11-18. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. TSB: Flash reprogramming allows the Electric Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for the Supra are released as field-fix procedures described in individual service bulletins. This bulletin details the ECU flash reprogramming process and outlines use of the Toyota-ISTA Diagnostic Software. BEFORE beginning any reprogramming, ensure that the latest version of Toyota-ISTA is downloaded and installed from TIS. NOTE ECU is a Toyota term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. For the purposes of this bulletin, the term ?ECU? is used as a generic label for the following SAE J1930 standard references: ? Powertrain Control Module (PCM) ? Engine Control Module (ECM) ? Transmission Control Module (TCM) ? Any other Toyota specific control unit
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-TT-0553-192019-09-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. 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-SB-0083-192019-09-03. Service bulletin. ELECTRICAL SYSTEM; STRUCTURE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. TSB: Pre-Delivery Service (PDS) is a critical step in satisfying our new car customers. Customer feedback indicates the following areas deserve special attention when performing PDS: ? Careful inspection for paint chips/scratches and body dents/dings. ? Proper operation of electrical accessories. ? Interior cleanliness. ? Proper function of mechanical systems. Customer retention and proper maintenance of vehicles are and have always been a major focus for Toyota. To help remind customers that regular service is essential to the proper maintenance of the vehicle, dealers are required to install a service reminder sticker before delivery. By doing this, customers will be reminded to return to your dealership for service. Your current service reminder sticker may be used. (See PDS Check Sheet item 9 of ?Final Inspection and Cleaning.?) A PDS Check Sheet has been developed for the 2020 model year Supra. Bulletins are available for items in bold type.
T-SB-0081-192019-09-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. TSB: Transport mode disables various electrical functions while the vehicle is being shipped to help prevent the vehicle battery from being drained. While in transport mode, the ?Transport Mode Indicator? is displayed on the combination meter. The indicator will turn off after transport mode is deleted. Follow the procedures in this bulletin during Pre-Delivery Service (PDS) to activate the navigation maps and delete transport mode using the Supra diagnostic application (ISTA). NOTE To perform navigation map activation during the Transport Mode Deletion Procedure, the following items must be completed in advance. Refer to the Ordering License Key section of this bulletin for more details. ? Dealer user registration on www.supramapactivation.com ? License key order placed and completed (1 ? 3-day process)
T-TT-0549-192019-07-15. Service bulletin. ELECTRICAL SYSTEM. TT: The new 12V Battery Warranty Testers (DSS-5000 & DCA-8000) require certain information to generate a test result and warranty code. Below is an explanation of what information is required when testing a 12V battery on the new Warranty Battery Testers.
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.