2021 Toyota Sienna Hybrid Technical Service Bulletins

176 technical service bulletins (TSBs) are on record for the 2021 Toyota Sienna Hybrid. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 11037202Aug 20, 2026Engine. OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T-SB-0051-26.
• 11037201Aug 20, 2026Engine. This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries.
• 11037186Aug 11, 2026Engine. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
• 11033412May 14, 2026Electrical system. Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing extended coverage under this Customer Support Program for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator.
• 11029896Feb 27, 2026Engine. OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.
• 11028726Jan 30, 2026Electrical system. OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
• 11028722Jan 28, 2026Electrical 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.
• 11028712Jan 7, 2026Other or unknown. Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle…
• 11028711Jan 6, 2026Electrical system. Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing extended coverage under this Customer Support Program for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator.
• 11027555Dec 2, 2025Body and structure. Some customers may experience a condition in which the 2021-2025 Sienna HV 2nd row FRAME SUB-ASSY, No.1 does not function even when the stow lever is pulled. Because the cable has come off from the bracket that holds it inside.
• 11026304Nov 6, 2025Body and structure. Some 2021 – 2025 model year Sienna Hybrid vehicles may exhibit a sloshing or splashing noise from inside one or more door panels when driving, opening and/or closing a door, and/or braking. This condition may be caused by cavity wax, debris, or other materials that may block door drain holes and restrict water from draining properly.
• 11024081Sep 17, 2025Electrical system. Technical instructions for customer support program 22te09 hv floor under wire harness and rear traction motor cable corrosion certain 2021 – 2024 model year sienna hybrid
• 11024080Sep 17, 2025Electrical system. Although the HV Floor Under Wire Harness and Rear Traction Motor Cable is covered by Toyota’s New Vehicle Limited Warranty for 3 years or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing extended coverage under this Customer Support Program for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator.
• 11022949Aug 7, 2025Engine. The specific condition covered by this program is for a small engine coolant leak that can occur from the flow shut-off valve that can allow coolant to drip on other parts of the vehicle. This can cause "Engine Maintenance Required" to be displayed on the instrument cluster or cause the A/C not to function normally.
• 11021712Jul 1, 2025Electrical system. 22TD04 Expired on June 30, 2025 A Toyota Genuine Accessory Dash Camera was installed in the involved vehicles. If the Micro SD Card used in the accessory dash camera is damaged the accessory dash camera may continuously attempt to read/write data to the card. This can lead to an increase in temperature of the card and may lead to localized melting of the card and the surrounding area of the dash cam.
• 11021711Jul 1, 2025Electrical system. 22TD04 Expired on June 30, 2025 A Toyota Genuine Accessory Dash Camera was installed in the involved vehicles. If the Micro SD Card used in the accessory dash camera is damaged the accessory dash camera may continuously attempt to read/write data to the card. This can lead to an increase in temperature of the card and may lead to localized melting of the card and the surrounding area of the dash cam.
• 11020668Jun 19, 2025Engine. Some 2018 – 2021 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, or M20A-FKS engine may exhibit a condition in which an “Engine Maintenance Required” message is displayed in the Multi-Information Display (MID). Additionally, the vehicle will exhibit DTC(s) P268111 (Engine Coolant Bypass Valve Circuit Short to Ground) and/or P268115 (Engine Coolant Bypass Valve Circuit Short to Battery or Open).
• 11020657Jun 13, 2025Electrical 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.
• 11019349Apr 16, 2025Forward collision avoidance. Technical instructions for 25tc03 reprogramming for forward recognition camera certain 2023 corolla cross 2023 corolla cross hv 2023 bz4x
• 11019348Apr 16, 2025Forward collision avoidance. Frequently Asked Questions SPECIAL SERVICE CAMPAIGN 25TC03 Certain 2023 Model Year Corolla Cross Certain 2023 Model Year Corolla Cross HV Certain 2023 Model Year bZ4x Certain 2021-2023 Model Year Sienna HV TSS 3.0 Forward Recognition Camera Software Update
• 11019347Apr 16, 2025Forward collision avoidance. Included vehicles are equipped with Toyota Safety Sense (TSS) 3.0, which includes the Pre-Collision System (PCS), which uses the forward recognition camera. In rare cases, a software programming issue can damage the forward recognition camera. This will result in the Pre-Collision System not working the next time the car is started.
• 11018346Apr 16, 2025Forward collision avoidance. Technical instructions for 25tc03 reprogramming for forward recognition camera certain 2023 corolla cross 2023 corolla cross hv 2023 bz4x
• 11018345Apr 16, 2025Forward collision avoidance. Frequently Asked Questions SPECIAL SERVICE CAMPAIGN 25TC03 Certain 2023 Model Year Corolla Cross Certain 2023 Model Year Corolla Cross HV Certain 2023 Model Year bZ4x Certain 2021-2023 Model Year Sienna HV TSS 3.0 Forward Recognition Camera Software Update
• 11018344Apr 16, 2025Forward collision avoidance. Included vehicles are equipped with Toyota Safety Sense (TSS) 3.0, which includes the Pre-Collision System (PCS), which uses the forward recognition camera. In rare cases, a software programming issue can damage the forward recognition camera. This will result in the Pre-Collision System not working the next time the car is started.
• 11019332Apr 2, 2025Electrical 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.
• 11018329Apr 2, 2025Electrical 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.
• 11016794Feb 20, 2025Engine. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
• 11015508Feb 20, 2025Engine. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
• 11015882Feb 12, 2025Engine. OBSOLETE NOTICE February 11, 2025: This bulletin is now obsolete. Please see T-SB-0021-25.
• 11016786Feb 11, 2025Electrical 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.
• 11015500Feb 11, 2025Electrical 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.
• 11016782Feb 10, 2025Engine. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical Information System (TIS) and the Calibration…
• 11016781Feb 10, 2025Electrical system. 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.
• 11015496Feb 10, 2025Engine. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical Information System (TIS) and the Calibration…
• 11015495Feb 10, 2025Electrical system. 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.
• 11014205Jan 28, 2025Engine. Some 2021-2025 MY Highlander HV, Sienna HV, RAV4, and RAV4 HV, may exhibit an oil leak from the area where the camshaft cover, camshaft housing, and the timing chain covers meet. This is typically seen on the exhaust side of the engine.
• 11014193Jan 23, 2025Electrical system. OBSOLETE NOTICE January 23, 2025: This bulletin is now obsolete. Please see T-SB-0011-25.
• 11014190Jan 23, 2025Electrical system. When certain vehicle ECUs are replaced, the ECU Security Key must be written in order for that ECU to communicate on the vehicle network. The GTS+ Software Health Check Results screen has been enhanced to help identify if a replacement ECU requires an ECU Security Key.
• 11014177Jan 6, 2025Body and structure. Some 2021 – 2024 model year Sienna Hybrid vehicles may exhibit a condition in which the front passenger carpet is untucked and torn at the center console, as shown in Figure 1. To address this concern, a carpet patch has been developed to reduce the likelihood of this condition from occurring.
• 11014174Jan 5, 2025Engine. Some 2018 – 2021 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, or M20A-FKS engine may exhibit a condition in which an “Engine Maintenance Required” message is displayed in the Multi-Information Display (MID). Additionally, the vehicle will exhibit DTC(s) P268111 (Engine Coolant Bypass Valve Circuit Short to Ground) and/or P268115 (Engine Coolant Bypass Valve Circuit Short to Battery or Open).
• 10249327Dec 19, 2024Engine cooling, Other or unknown. TT: Engine Oil Leak between the Lower Oil Pan and Crank Case
• 11012753Dec 10, 2024Engine. This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries. This bulletin should be used in conjunction with the applicable model and model year Repair Manual while performing the battery rescue charge. The GRX-5100 should be used wherever the Repair Manual references the Toyota Hybrid System (THS) charger.
• 11012750Dec 9, 2024Engine. CUSTOMER SUPPORT PROGRAM 24TE04 Multiple Model & Model Year Toyota Vehicles Coverage for Flow Shut-off Valve Coolant Leak Frequently Asked Questions
• 11012749Dec 9, 2024Engine. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
• 11012744Dec 6, 2024Body and structure. The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix with rainwater, nighttime dew, or high humidity to form acidic compounds. If these contaminants settle and remain on a painted vehicle surface, especially the horizonal areas of the hood, roof, and decklid, significant damage can occur. This damage is the result of actual etching of the paint and appears as…
• 11012743Dec 6, 2024Body and structure. To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from weather elements and initial rust before the vehicle is delivered to the customer. Consequently, the film should remain on the wheel for as long as possible.
• 11012742Dec 6, 2024Body and structure. Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical impurities in the atmosphere. If these acidic compounds settle on an exposed vehicle, especially the horizontal areas such as the hood, roof, and decklid, significant damage to the painted surfaces can occur. Acid rain damage can typically be identified on vehicles by the presence of stains on the paint surface…
• 11012738Dec 5, 2024Engine. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
• 11012735Dec 5, 2024Body and structure. Toyota vehicles are currently protected with RapgardTM protective film designed to protect the horizontal painted surfaces. This material protects from acid rain, environmental fallout, and rail contamination. Follow the Removal Procedure in this bulletin to remove the RapgardTM protective film within 90 days from initial application.
• 11012734Dec 5, 2024Engine. In our continuing efforts to ensure the best in customer satisfaction, Toyota is announcing a Customer Support Program to provide coverage for Flow Shut-off Valve Coolant Leak on multiple Model & Model Year Toyota Vehicles. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership…

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