Service bulletins for the 2021 Toyota Sienna
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.
176 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
Only bulletins with component: Electrical system are shown. Show all
| T-SB-0095-20 Rev | 2021-02-01. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM. TSB: Some 2020 model year Camry, Camry Hybrid, Corolla Hatchback, RAV4, and RAV4 Hybrid vehicles may exhibit one or more of the following conditions: ?Diagnostic Trouble Code (DTC) B15A804 is present in current or history. ?Red SOS LED stays on after bulb check. ?Toyota App does not accept the activation code. ?Toyota App is inoperative. ?SOS call center does not receive the vehicle?s location in a timely manner. ?Toyota App shows an error 42 when trying to execute a command. ?Unable to remote start the vehicle with the key fob (if equipped). ?Unable to subscribe to remote services. ?Unable to activate Wi-Fi. ?Destination Assist is inoperative. Some 2020 ? 2021 model year Camry, Camry Hybrid, Corolla Hatchback, RAV4, and RAV4 Hybrid vehicles and some 2021 model year Avalon, Avalon Hybrid, Corolla, Corolla Hybrid, Sienna Hybrid, and Venza Hybrid vehicles may exhibit one or more of the following conditions: ?DTC B15A804 is present in current or history. ?Red SOS LED stays on after bulb check. ?Toyota App is inoperative. ?Unable to subscribe to remote services. ?Unable to activate Wi-Fi. ?Depleted 12V vehicle battery when in IG-OFF. A DCM reset and firmware update is now available to address these conditions. Follow the DCM Reset and Firmware Update Procedure in this bulletin to update the firmware. |
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| T-SB-0066-20 Rev | 2021-01-25. Service bulletin. EQUIPMENT; PARKING BRAKE; ELECTRICAL SYSTEM. TSB: Some 2020 model year vehicles equipped with Audio Plus (version 1060) or Premium Audio (version 1060) or earlier may exhibit the following concern: ?Distorted screen when using Apple CarPlay® while making a hands-free phone call. Some 2020 model year vehicles equipped with Audio Plus (version 1021) or Premium Audio (version 1021) or earlier may exhibit one or more of the following conditions: ?Barge in function defaulted to OFF. ?Limited phone book grammar. ?Difficult Hand Free operation. ?Abnormal Electronic Owner?s Manual operation ?Music does not automatically resume when using Android Auto?. ?Cover a. rt is not displayed. ?Vehicle position is not sent to Destination Assist server. ?System inoperative after using the return button when using voice recognition Some 2020 model year vehicles equipped with Audio Plus (version 1035) or Premium Audio (version 1035) or earlier may exhibit one or both of the following conditions: ?Abnormal screen play while using Apple CarPlay® (primarily during phone calls). ?Poor sound quality during phone calls while using Apple CarPlay®. Some 2020 model year vehicles equipped with Audio Plus (version 1047) or Premium Audio (version 1047) or earlier may exhibit one or more of the following conditions: ?USB audio does not resume after ignition cycle. ?Intermittent rebooting. ?Bluetooth disconnecting during a phone call when using Apple CarPlay®. ?Intermittent screen freezing. ?Navigation intermittently will not boot up. ?Home Screen Audio widget is blank after a Destination Assist call. ?Song, artist, or album data missing. ?Abnormal clock operation. ?Apple CarPlay® intermittently inoperative. ?Radio takes a long time to boot up. A software update is now available to address these conditions. Follow the Software Update Procedure in this bulletin to update the software |
| T-TT-0634-20 | 2020-12-21. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. TT: Some vehicles may experience an issue related to the DCM, the following information is consolidating the available diagnostic information in one document. |
| T-SB-0108-20 | 2020-11-30. Service bulletin. EQUIPMENT; STRUCTURE; ELECTRICAL SYSTEM. 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 (including interior light, clock, and radio reset). ?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 8 of ?Final Inspection and Cleaning.?) This bulletin contains the PDS procedures which apply specifically to 2021 model year Sienna Hybrid vehicles. A universal PDS Check Sheet that contains PDS steps that apply to all 2021 model year Toyota vehicles has been developed. To properly perform a complete PDS, you must complete all procedures contained in this TSB as well as the universal PDS Check Sheet. In addition, if the vehicle is stored for over 30 days, be sure to follow Long-Term Vehicle Storage Guidelines. |
| T-SB-0039-20 Rev | 2020-11-30. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TSB: An initialization procedure is required to activate the Entune? 3.0 App Suite Connect for Audio, Audio Plus, and Premium Audio head units before they are used for the first time on new vehicles. The initialization procedure may also be performed under other circumstances, such as following a head unit replacement or after the customer?s personal settings are erased. The initialization procedure requires between 3 and 15 minutes to complete, depending on file size, cellular connection speed, and other factors. Following the initialization procedure, individual Entune? 3.0 apps may periodically update through an over-the-air update system. Updates are either optional or mandatory. The update procedure will take approximately 1 minute for each app requiring an update. Follow the Initialization/Update Procedure in this bulletin to perform the initialization and app updates. |
| T-SB-0040-20 Rev | 2020-07-27. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TSB: Hybrid vehicles are equipped with two types of batteries: ?Hybrid Vehicle (HV) battery ?Auxiliary (12V) battery If the hybrid vehicle is put into storage, the State-Of-Charge (SOC) of its HV battery and auxiliary battery will gradually decrease. To prevent the auxiliary battery from becoming discharged during storage, proper maintenance is necessary. |
| T-SB-0064-18 Rev | 2020-07-27. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:ANTI-THEFT DEVICES. TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered keys will be erased and can never be reused. Another feature, Add/Remove Key, is also available. Once a key is removed, it can never be reused. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.