Service bulletins for the 2021 Toyota 4Runner
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.
128 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Electrical system are shown. Show all
| T-SB-0106-22 Rev2 | 2026-02-11. Service bulletin. ELECTRICAL SYSTEM. OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26. |
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| T-SB-0001-26 | 2026-02-11. Service bulletin. ELECTRICAL SYSTEM. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software. |
| T-SB-0058-23 Rev1 | 2025-07-10. Service campaign. ELECTRICAL SYSTEM. The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks. |
| T-TT-0780-25 | 2025-06-06. Service bulletin. ELECTRICAL SYSTEM. To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE. |
| T-TT-0780-25 | 2025-05-15. Service bulletin. ELECTRICAL SYSTEM. To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE. |
| T-SB-0106-22 Rev2 | 2025-04-08. Service bulletin. ELECTRICAL SYSTEM. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update, however, the process for generating license keys differs from previous generations. |
| T-SB-0106-22 Rev2 | 2025-03-11. Service bulletin. ELECTRICAL SYSTEM. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update, however, the process for generating license keys differs from previous generations. |
| TSB002620 | 2023-12-26. Service bulletin. UNKNOWN OR OTHER; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:SOFTWARE; FORWARD COLLISION AVOIDANCE; AIR BAGS. TSB: All 2020 ? 2023 model year 4Runner, 2018 ? 2022 model year Sequoia, 2018 ? 2023 model year Tacoma, and 2018 ? 2021 model year Tundra vehicles are equipped with Pre-collision System (PCS) and Dynamic Radar Cruise Control (DRCC) as part of the Toyota Safety Sense (TSS) package. The PCS and DRCC systems are designed to help mitigate a potential collision and maintain a pre-determined traveling distance. It is recommended to disable the PCS and DRCC systems on vehicles that have been modified (ride height, oversized wheels/tires, brush bars, etc.) in a way that potentially disrupts the functionality of these systems. Vehicle owner?s written consent is required before performing the calibration to permanently disable the PCS and DRCC systems. Follow the Repair Procedure in this bulletin to disable the PCS and DRCC systems. |
| 22TC01 Technical | 2023-11-27. Service bulletin. ELECTRICAL SYSTEM. TI: TECHNICAL INSTRUCTIONS FOR 22TC01 DATA COMMUNICATION MODULE (DCM) REPROGRAMMING CERTAIN 2021 MODEL YEAR C-HR, RAV4 PRIME, TUNDRA CERTAIN 2021-2022 4RUNNER, HIGHLANDER, HIGHLANDER HV, PRIUS PRIME, SEQUOIA, TACOMA CERTAIN 2022 PRIUS |
| T-SB-0057-18 | 2023-06-26. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. 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. Follow the procedures in this bulletin to reset a vehicle Immobilizer or Smart Key system. |
| Service Campaign | 2022-09-15. Service bulletin. ELECTRICAL SYSTEM. DL: Due to improper programming of the Data Communication Module (DCM), which provides cellular communication in various situations, including emergencies, the driver and Safety Connect operator may not be able to hear each other?s voices during a Safety Connect call |
| 22TC01 | 2022-06-21. Service bulletin. ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR 22TC01 DATA COMMUNICATION MODULE (DCM) REPROGRAMMING CERTAIN 2021 MODEL YEAR C-HR, RAV4 PRIME, TUNDRA CERTAIN 2021-2022 4RUNNER, HIGHLANDER, HIGHLANDER HV, PRIUS PRIME, SEQUOIA, TACOMA CERTAIN 2022 PRIUS |
| 22TC01 Technical | 2022-05-16. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR 22TC01 DATA COMMUNICATION MODULE (DCM) REPROGRAMMING CERTAIN 2021 MODEL YEAR C-HR, RAV4 PRIME, TUNDRA CERTAIN 2021-2022 4RUNNER, HIGHLANDER, HIGHLANDER HV, PRIUS PRIME, SEQUOIA, TACOMA CERTAIN 2022 PRIUS |
| 22TC01 Team Memb | 2022-04-18. Service bulletin. AIR BAGS; ELECTRICAL SYSTEM; SEAT BELTS. SSC: SPECIAL SERVICE CAMPAIGN 22TC01 Over-the-Air (OTA) pilot program. This pilot program would enable you to complete Special Service Campaign 22TC01 for DCM (Data Communication Module) Reprogramming for Safety Connect, which includes your vehicle. With your active telematics account, you are encouraged to complete this campaign using this Over-the-Air (OTA) update by following these steps: 1) To complete this update, each Team Member will use the Toyota/Lexus App installed on their phone. 2) Within a few days of this E-Mail, we will send a notification to your Toyota/Lexus app to schedule and install the update on your vehicle. 3) Click on either the notification on your lock screen or the tile in the app to review the update and then continue in the App to approve the update. 4) The night after you approve the update, the telematics module will perform the update, and you will receive a confirmation notification through the app. |
| T-TT-0599-20 Rev | 2022-04-18. Service bulletin. ELECTRICAL SYSTEM. TT: Vehicle control apps might not operate as expected at times due to preconditions (normal operating parameters) not being established, vehicle settings and/or network/cellular coverage concerns |
| 22TC01 Technical | 2022-03-14. Service bulletin. ELECTRICAL SYSTEM. TI: TECHNICAL INSTRUCTIONS FOR 22TC01 DATA COMMUNICATION MODULE (DCM) REPROGRAMMING CERTAIN 2021 MODEL YEAR C-HR, RAV4 PRIME, TUNDRA CERTAIN 2021-2022 4RUNNER, HIGHLANDER, HIGHLANDER HV, PRIUS PRIME, SEQUOIA, TACOMA CERTAIN 2022 PRIUS |
| 22TC01 Region Le | 2022-03-14. Service bulletin. ELECTRICAL SYSTEM. RL: Due to improper programming of the Data Communication Module (DCM), which provides cellular communication in various situations, including emergencies, the driver and Safety Connect operator may not be able to hear each other?s voices during a Safety Connect call. |
| 22TC01 Dealer Le | 2022-03-14. Service bulletin. ELECTRICAL SYSTEM; AIR BAGS. DL: Due to improper programming of the Data Communication Module (DCM), which provides cellular communication in various situations, including emergencies, the driver and Safety Connect operator may not be able to hear each other?s voices during a Safety Connect call |
| T-SB-0003-22 | 2022-02-14. Service bulletin. ELECTRICAL SYSTEM:WIRING. TSB This Service Bulletin includes guidelines meant to help determine whether to repair or replace a wire harness assembly based on damage type. This Service Bulletin should be used in conjunction with the applicable model and model year Electronic Wiring Diagram (EWD) and/or Repair Manual. |
| T-TT-0593-20 Rev | 2022-02-14. Service bulletin. ELECTRICAL SYSTEM:ADAS:DRIVER MONITORING:SOFTWARE; ELECTRICAL SYSTEM. TT: Some customers may experience the inability to activate Remote Connect or Remote Connect becoming inoperative when attempting to send commands to the vehicle. To simplify the diagnosis of this system and prevent the unnecessary replacement of parts, please refer to the procedure below. |
| T-SB-0043-21 Rev | 2022-02-14. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE; EQUIPMENT:ELECTRICAL:AUX AUDIO JACK/PLUG; EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. TSB: Some 2020 model year vehicles equipped with Audio Plus (version 1060) or Premium Audio (version 1060) or earlier may exhibit the following condition: ?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 art 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-0611-20 Rev | 2021-06-21. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). TT: To assist with the early detection and early resolution of audio related concerns, it may be requested as part of the remanufactured head unit return to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by audio suppliers, FTS, and/or FPEs. |
| T-SB-0025-21 | 2021-06-21. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. TSB: Some 2020 ? 2021 model year vehicles equipped with Audio, Audio Plus, or Premium Audio (versions 1784) or earlier may exhibit one or more of the following conditions: ?Intermittent blank screen. ?Navigation map update fails. ?Album art inoperative. ?Pause function intermittently inoperative in CD mode. ?Intermittent DTC B15FE present. ?Abnormal energy flow screen appearance on Hybrid models. ?Abnormal phone call operation during Apple CarPlay®. ??No Information? displayed in Information Screen. ?No audio after voice guidance in Android Auto. ?Abnormal charging scheduling operation on RAV4 Prime models. ?Abnormal XM operation when using Apple CarPlay®. Follow the Multimedia Software Update Procedure in this bulletin to install the latest software version. |
| T-TT-0599-20 Rev | 2021-04-19. Service bulletin. ELECTRICAL SYSTEM; BACK OVER PREVENTION. TT: Vehicle control apps might not operate as expected at times due to preconditions (normal operating parameters) not being established, vehicle settings and/or network/cellular coverage concerns. |
| 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 |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.