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Service bulletins for the 2018 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.

300 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
T-SB-0053-192019-06-24. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL. TSB: Entune? 3.0 Audio Plus is now available with additional features such as Apple CarPlay® and Amazon Alexa? for 2018 model year Sienna vehicles. Follow the Software Update Procedure in this bulletin to install these new features. NOTE Performing this update may change certain head unit operation conditions. For a full list of changes, see System Limitations and FAQ.
T-SB-0047-192019-05-13. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM:SOFTWARE. TSB: Some 2018 ? 2019 model year Toyota vehicles equipped with the Entune? 3.0 Premium Audio 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. Before attempting to perform a map update, the head unit?s expiration date must be checked. If the expiration date is still valid, a license key may be generated without the use of an activation card number. Updating the maps without the use of an activation card number is considered an Embedded Navigation Update (refer to pg. 9), and performing this process does not extend the duration of telematic map services. If the head unit?s expiration date is expired, or is expiring within the next 90 days, it should be recommended to the customer to purchase an activation number. Utilizing an activation number will initiate a Dynamic Navigation Update (refer to pg. 2). This Dynamic Navigation Update will perform the Embedded Navigation Update and provide telematic map services for a period of two years from the day that the Dynamic Navigation Update is performed. Activation card numbers are provided in an activation card number pamphlet available through the normal parts ordering system. Follow the process in this bulletin to perform the update. NOTE Map data is released once each year through the shipment of an SST USB flash drive to each dealer. The SST MUST be stored in the SST cabinet to ensure it can be easily found
K0A_Sienna Camry2019-05-13. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE. Technical Instructions: Update 4/5/2019: Note added on p. 6. TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN K0A ENGINE ECU SOFTWARE UPDATE CERTAIN 2018 CAMRY & 2018 SIEN
K0A_Dealer Lette2019-04-15. Service bulletin. ENGINE; ELECTRICAL SYSTEM. Dealer Letter: The engine ECUs in the subject vehicles are equipped with software to monitor the rear oxygen sensors. Under a specific condition, this software may not detect a malfunctioning sensor due to an error in the software. As a result, affected vehicles do not meet certain onboard diagnostic (OBD) regulations.
T-TT-0484-18-Rev2019-03-25. Service bulletin. ELECTRICAL SYSTEM. TT: Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low. These settings may need to be reapplied any time the phone is paired to a new head unit, a phone update is applied, or the phone is un-paired and re-paired.
T-TT-0414-16-Rev2019-03-25. Service bulletin. EQUIPMENT:ELECTRICAL; EQUIPMENT; ELECTRICAL SYSTEM. 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-SB-0019-192019-03-25. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT:ELECTRICAL. TSB: This bulletin details the supplemental procedure to confirm Telematics Data Communication Module (DCM) activation for applicable 2017 ? 2019 model year Toyota vehicles after the process is initiated by Techstream. The steps outlined in this bulletin include: ? Techstream Messages ? DCM Activation Confirmation ? Vehicle Confirmation
T-SB-0013-192019-02-19. Service bulletin. ELECTRICAL SYSTEM. TSB: Some 2016 - 2018 model year Prius and Tacoma, 2017 - 2018 model year Prius Prime and Sienna, and 2018 model year Camry and Camry Hybrid vehicles may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P261093 (ECM/PCM Engine Off Timer Performance No Operation) present. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition. Follow the Repair Procedure in this bulletin to address this condition.
T-TT-0472-172018-11-05. Service bulletin. EQUIPMENT; EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM. TT: Some customers may experience an inoperative Entune Apps Suite after connecting an Apple device with iOS version 11-2 or later via USB tethering.
T-TT-0470-172018-11-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL; EQUIPMENT. TT: All grades of 2018MY Sienna vehicles are not compatible with Entune 3-0 Remote Connect app features. The Toyota Entune 3-0 Remote Connect mobile app lets you lock and unlock doors, start the engine, find your vehicle in a parking lot, and monitor guest drivers.
T-SB-0068-182018-08-20. Service bulletin. ELECTRICAL SYSTEM. TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin No. T-SB-0235-17. ? Applicability has been updated to include 2019 model year Toyota vehicles. Service Bulletin No. T-SB-0235-17 is obsolete and any printed versions should be discarded. An initialization procedure is required to activate the Entune 3.0, App Suite Connect for Entune 3.0, Audio Entune 3.0 , Audio Plus, and Entune 3.0 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. A Wi-Fi connection is recommended for optimal functionality when downloading software via a smartphone. Download the latest Entune? 3.0 app onto the smartphone. Following the initialization procedure, individual Entune 3.0 apps may periodically update through an over-the-air update system. Updates are optional or mandatory. The update procedure will take approximately 1 minute for each app requiring an update. Follow the procedure in this bulletin to perform the initialization and app updates. Additionally, a Safety Connect static cling is available to increase customer awareness. This bulletin also includes the vehicle identification process for Safety Connect-equipped vehicles and the static cling installation procedure.
T-TT-0442-172018-07-02. Service bulletin. EQUIPMENT; EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM. TT: Safety Connect is a vehicle option which requires a subscription fee for the system to be active. The first year of service is provided in the vehicle purchase price. Once the subscription has expired the DCM (Telematics Transceiver) will be in an inactive state. In some instances, a DCM may need to be replaced even though the customer is not using the service.
T-TT-0498-182018-06-18. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TT: Some customers may experience issues using Entune or Scout functions of the head unit. The following is a diagnostic supplement to assist in understanding how to diagnose this system.
T-TT-0472-172018-06-11. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TT: Some customers may experience an inoperative Entune? Apps Suite after connecting an Apple device with iOS version 11.2 or later via USB tethering.
T-TT-0470-172018-06-11. Service bulletin. ELECTRICAL SYSTEM; LATCHES/LOCKS/LINKAGES:DOORS:LATCH. TT: All grades of 2018MY Sienna vehicles are not compatible with Entune? 3.0 Remote Connect app features. The Toyota Entune? 3.0 Remote Connect mobile app lets you lock and unlock doors, start the engine, find your vehicle in a parking lot, and monitor guest drivers.
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-SB-0001-18_Rev2018-04-02. Service bulletin. ELECTRICAL SYSTEM. TSB: REVISION NOTICE February 02, 2018 Rev1: ? Applicability has been updated to include 2018 model year Sienna vehicles. ? The entire bulletin has been updated. Any previous printed versions of this bulletin should be discarded. When completing a transaxle assembly replacement, Engine Control Module (ECM) (SAE term: Powertrain Control Module [PCM]) replacement, or ECM (PCM) reprogram, ensure the correct ECM (PCM) software is matched with the transaxle assembly hardware. Some 2017 ? 2018 model year Highlander and Sienna vehicles require different ECM (PCM) software based on the transaxle assembly hardware installed in the vehicle. NOTICE Mismatched transaxle assembly hardware and ECM (PCM) software combinations may result in a harsh shift or shift flare. If this occurs after the original repair, additional ECM (PCM) replacement and reprogramming will be required. This additional ECM (PCM) replacement and/or reprogramming is NOT covered under warranty. Use the information in this Service Bulletin to confirm that the correct ECM (PCM) hardware and software are used based on the transaxle assembly part number and serial number.
T-SB-0195-172018-04-02. Service bulletin. ELECTRICAL SYSTEM. TSB: A battery in a stored vehicle is subject to conditions that can reduce its performance and life. These conditions include storage period, temperature, parasitic drain, and battery load. Because of these factors, battery inspection and maintenance are required in order to ensure proper operation and optimal battery life. As a matter of policy, Toyota does not provide battery warranty coverage for discharges and/or failed batteries due to lack of maintenance. It is the dealer's responsibility to maintain the specific State-Of-Charge (SOC) of the vehicle's battery while in stock and assure proper SOC at delivery.
T-SB-0235-17_Rev2018-03-12. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; ELECTRICAL SYSTEM. TSB: REVISION NOTICE February 16, 2018 Rev2: ? Applicability has been updated to include 2018 model year Mirai and Camry HV vehicles. ? The Introduction and Initialization/Update Procedure sections have been updated. ? Instructions for adding a Safety Connect static cling to applicable vehicles have been added. July 20, 2017 Rev1: ? Applicability has been updated to exclude 2018 model year Avalon vehicles. ? The Initialization/Update Procedure section has been updated. Any previous printed versions of this bulletin should be discarded. An initialization procedure is required to activate the Entune? App Suite Connect for Entune? 3.0 Audio, Entune? 3.0 Audio Plus, and Entune? 3.0 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? apps may periodically update through an over-the-air update system. Updates are optional or mandatory. The update procedure will take approximately 1 minute for each app requiring an update. Follow the procedure in this bulletin to perform the initialization and app updates. Additionally, a Safety Connect static cling is available to increase customer awareness. This bulletin also includes the vehicle identification process for Safety Connect-equipped vehicles and the static cling installation procedure.
T-SB-0015-182018-03-12. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL. TSB: Some 2018 model year Camry, Camry HV, and Sienna vehicles may exhibit Bluetooth® connectivity conditions with the multimedia system. This Service Bulletin is a diagnostic supplement to help determine the cause of the Bluetooth® connectivity conditions.
T-SB-0001-18_Rev2018-03-12. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). TSB: REVISION NOTICE February 02, 2018 Rev1: ? Applicability has been updated to include 2018 model year Sienna vehicles. ? The entire bulletin has been updated. Any previous printed versions of this bulletin should be discarded. When completing a transaxle assembly replacement, Engine Control Module (ECM) (SAE term: Powertrain Control Module [PCM]) replacement, or ECM (PCM) reprogram, ensure the correct ECM (PCM) software is matched with the transaxle assembly hardware. Some 2017 ? 2018 model year Highlander and Sienna vehicles require different ECM (PCM) software based on the transaxle assembly hardware installed in the vehicle. NOTICE Mismatched transaxle assembly hardware and ECM (PCM) software combinations may result in a harsh shift or shift flare. If this occurs after the original repair, additional ECM (PCM) replacement and reprogramming will be required. This additional ECM (PCM) replacement and/or reprogramming is NOT covered under warranty. Use the information in this Service Bulletin to confirm that the correct ECM (PCM) hardware and software are used based on the transaxle assembly part number and serial number.
T-SB-0337-172018-01-16. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TSB: Some customers may complain of the inability to use certain functions of the navigation/infotainment system while the vehicle is in motion. The following software update modifies the system functionality while the vehicle is in motion, improving customer experience. New software is available to address the following: ? Phone keypad unlocked while vehicle is in motion ? Contact list unlocked while vehicle is in motion ? Bluetooth connected phone switching while vehicle is in motion ? Navigation transition improvements (if equipped) ? Revised BT-Audio help pop-up ? Call history list call function improvements ? Reboot after coming out of Reverse ? Errors during phonebook transfer ? Sound settings reset after ignition key cycle ? Surround turns back on after key cycle ?Abnormal operation when listening to FM HD Radio

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