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Service bulletins for the 2016 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.

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

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Bulletins, newest first
T-SB-0049-16 Rev2018-04-23. Service bulletin. VISIBILITY:REARVIEW MIRRORS/DEVICES:EXTERIOR. TSB: Some 2015 ? 2016 model year Avalon, Camry, Sienna, and Tundra vehicles equipped with Blind Spot Monitor may exhibit a Blind Spot Monitor Warning message with Diagnostic Trouble Code (DTC) C1AB2 Short to Ground in Outer Mirror Indicator (Master) or C1AB3 Short to Ground in Outer Mirror Indicator (Slave) stored. Follow the Repair Procedure in this bulletin to address this condition.
T-TT-0339-152018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. TT: Some vehicles may exhibit an error message when trying to perform a radio software update: "Unable to update the software. Please try again later." If the following screen is seen, follow the directions below.
TTT-0268-13 Rev32018-04-23. Service bulletin. ELECTRICAL SYSTEM. TT: Some customers may encounter Bluetooth connectivity concerns such as: ? Difficulty pairing the phone. ? Intermittent Bluetooth failure to connect when first turning on the vehicle. ? Various Bluetooth Audio functions are no longer functioning with the customer?s phone, such as the 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-SB-0026-162018-04-23. Service bulletin. VEHICLE SPEED CONTROL:CRUISE CONTROL. TSB: Some 2014 ? 2016 model year Sienna vehicles may exhibit an intermittent cruise control stalk illumination flicker condition. Please follow the Repair Procedure in this bulletin to address the condition.
T-SB-0024-162018-04-23. Service bulletin. POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. TSB: Some 2015 ? 2016 model year Sienna vehicles may exhibit a grease leak where grease is coming through the boot clamp area on the big end of the outboard front axle shaft joint. Follow the Repair Procedure in this bulletin to address the condition.
T-TT-0385-162018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Tech Tip: This Tech Tip is being provided to bring attention to the new location of the Entune/NAV/Map Update and Upgrade USB Directory. Click on the TIS tab, Diagnostics tab, Telematics tab, and the document is now located under the reference documents sections. This change has occurred to help speed up the updating process of this document.
T-SB-0008-162018-04-23. Service bulletin. ELECTRICAL SYSTEM; STRUCTURE. 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 vehiucles has been a major focus for Toyota. To help remind customers that regular oil changes are essential to the proper maintence of their vehicle, installing a first oil change reminder sticker is required prior to delivery. By doing this, customers will be reminded to return to a dealership for their first oil change. Your current oil change reminder sticker may be used. (See PDS Check Sheet item 9 of ?Final Inspection & Cleaning.?) A new PDS Check Sheet has been developed for the 2016 model year Sienna. Some check points have been added, expanded, or clarified. Bulleting are available for items in bold type.
T-SB-0007-162018-04-23. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Pre-Delivery Service Check Sheet
T-SB-0006-162018-04-23. Service bulletin. EQUIPMENT; STEERING. TSB: As a result of the removal of the Short Pin, the power source to the steering angle sensor is cut off. When the Short Pin is reinstalled, the Parking Assist Monitor System will be operative, but it cannot display guidelines to assist parking operation because the center position is not recognized by the steering angle sensor. Please initialize the Parking Assist Monitor System after installing the Short Pin during Pre-Delivery Service (PDS).
TTT-0344-15 Rev12018-04-23. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. TT: iPhone text messages do not appear on multimedia dis[play.
T-TT-0360-152018-04-23. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. TT: Customers may experience connectivity issues when the following conditions are met: The customer's iPhone is operating on iOS9 firmware. The customer's iPhone is connected to the vehicle via Bluetooth. The customer may complain of the following issues: When receiving two incoming calls simultaneously, both calls are ended automatically. iTunes Radio app does not play via Bluetooth audio. Podcast and Audiobook media playback is inoperative via Bluetooth audio.
T-TT-0381-162018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. Tech Tip: Some customers may experience difficulty programming HomeLink.
TSB-0012-13 Rev22018-04-23. Service bulletin. ENGINE; ELECTRICAL SYSTEM:SOFTWARE. TSB: Flash reprogramming allows the 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 Techstream ECU flash reprogramming process and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard (CUW). Flash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. ECUs have internal security that will not allow them to be programmed with another ECU?s information.
G0G_TI_Sienna Ox2018-04-23. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Technical Instructions: The subject vehicles are equipped with an Oxygen Sensor which could experience wire degradation inside the Oxygen Sensor wiring harness caused by vehicle vibration during normal operation. If this occurs, the vehicle will illuminate the check engine light.
G0G_Dealer Lette2018-04-23. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Dealer Letter: The subject vehicles are equipped with an Oxygen Sensor which could experience wire degradation inside the Oxygen Sensor wiring harness caused by vehicle vibration during normal operation. If this occurs, the vehicle will illuminate the check engine light.
G0G_Dealer Lette2018-04-23. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Dealer email: The subject vehicles are equipped with an Oxygen Sensor which could experience wire degradation inside the Oxygen Sensor wiring harness caused by vehicle vibration during normal operation. If this occurs, the vehicle will illuminate the check engine light.
G0G_Region Lette2018-04-23. Service bulletin. ELECTRICAL SYSTEM; ENGINE. Region Letter: The subject vehicles are equipped with an Oxygen Sensor which could experience wire degradation inside the Oxygen Sensor wiring harness caused by vehicle vibration during normal operation. If this occurs, the vehicle will illuminate the check engine light.
G0G_Region Lette2018-04-23. Service bulletin. ELECTRICAL SYSTEM; ENGINE. Region email: The subject vehicles are equipped with an Oxygen Sensor which could experience wire degradation inside the Oxygen Sensor wiring harness caused by vehicle vibration during normal operation. If this occurs, the vehicle will illuminate the check engine light.
T-TT-0399-162018-04-23. Service bulletin. ELECTRICAL SYSTEM. TT: Multimedia systems reset procedure should be performed when the multimedia system no longer responds or reboots itself.
T-TT-0377-15_Rev2018-04-23. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. TT: Some customers may experience poor outgoing Bluetooth sound quality, this can occur for various reasons. Current multimedia systems are designed with the ability to adjust Bluetooth sound quality to compensate for Echo or excessive background noise.
T-TT-0375-15_Rev2018-04-23. Service bulletin. EQUIPMENT; EQUIPMENT:ELECTRICAL. TT: For customer concerns of no or poor outgoing sound from the Bluetooth systems there are diagnostics in the repair manual which can be performed to diagnose the condition.
T-SB-0229-12_Rev2018-04-23. Service bulletin. ELECTRICAL SYSTEM. TSB: REVISION NOTICE November 22, 2017 Rev1: ? Applicability has been updated to include 2014 ? 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. In the event that a Toyota vehicle becomes submerged in water, many components may be physically damaged. Electrical and electronic components, including wiring harnesses, are particularly susceptible to corrosion and subsequent malfunction. Although any flooding can be damaging, salt water flooding elevates the potential for abnormal conditions and may increase risks due to its highly corrosive and conductive nature. Salt residue also continues to corrode and remain conductive even after a vehicle dries. This bulletin is intended to assist with safe handling and inspection of flood damaged vehicles and to provide basic guidance on likely needed repairs.
T-TT-0463-172018-04-23. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; ENGINE AND ENGINE COOLING. T-TT: Some vehicles may exhibit an abnormal HVAC blower motor noise.
T-SB-0012-13 Rev2018-04-02. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TSB: OBSOLETE NOTICE: September 14, 2016: This bulletin is now obsolete. Please see T-SB-0134-16.
T-SB-0142-13 Rev2018-04-02. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. TSB: REVISION NOTICE November 10, 2016 Rev2: ? Applicability has been updated to include 2016 ? 2017 model year Toyota vehicles. ? Parts Information section has been updated. Some 2004 ? 2017 model year Toyota vehicles may exhibit odors naturally occurring from the HVAC system and/or related environmental factors. Although there is no way to eliminate these odors, follow the General Procedure in this bulletin to minimize the odors experienced.

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