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Service bulletins for the 2018 Toyota Highlander

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.

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

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By component

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Bulletins, newest first
T-TT-0468-17 Rev2020-08-17. Service bulletin. ENGINE AND ENGINE COOLING:COOLING SYSTEM. TT: HVAC drain tube is found to be blocked/clogged.
T-SB-0062-202020-08-03. Service bulletin. ELECTRICAL SYSTEM. TSB: Some 2004 ? 2020 model year Hybrid vehicles may exhibit an excessive buildup of dust, lint, or debris in the HV battery intake filter or cooling fan. The condition could reduce the efficiency of the HV battery cooling system. Perform the procedures outlined in this bulletin to address this condition.
T-TT-0615-20 Rev2020-07-27. Service bulletin. ENGINE. TT: The Toyota Quality group is looking to better understand our customers expectation regarding vehicle drivability. Specifically, we are looking at vehicle surge/hesitation condition (inconsistent acceleration) and would like to recover detailed customer voice and vehicle data.
T-TT-0615-202020-07-27. Service bulletin. ENGINE. TT: The Toyota Quality group is looking to better understand our customers expectation regarding vehicle drivability. Specifically, we are looking at vehicle surge/hesitation condition (inconsistent acceleration) and would like to recover detailed customer voice and vehicle data.
T-SB-0050-202020-06-22. Service bulletin. FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL; EQUIPMENT. TSB: Some 2018 - 2019 model year Highlander Hybrid vehicles may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P107B (Fuel Rail Pressure Sensor "B" Circuit Range/Performance).
T-TT-0516-18_Rev2020-06-22. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. TT: The microphone circuit passes through the DCM before reaching the radio/navigation system. To simplify the diagnosis of the microphone, Safety Connect SOS button lights, and DCM (Data Communication Module/telematics transceiver) inoperative conditions, refer to the procedure below to prevent unnecessary parts replacement.
T-SB-0119-15_Rev2020-06-15. Service bulletin. ELECTRICAL SYSTEM. TT: This bulletin includes basic procedures for performing a rescue charge on Ni-MH high voltage (HV) batteries. This bulletin should be used in conjunction with the applicable model and model year Repair Manual while performing a rescue charge. The GRX-5100 should be used wherever the Repair Manual references the Toyota Hybrid System (THS) charger.
T-TT-0537-19_Rev2020-05-11. Service bulletin. VISIBILITY; LANE DEPARTURE. TT: The blind spot monitor (BSM) sensor angle inspection is used to confirm that the BSM sensor is within the specified angle before performing axis beam adjustment. When used in conjunction with the repair manual, these BSM tips leverage SSTs and readily available tools to support sensor angle confirmation in varying shop environments.
T-TT-0583-19_Rev2020-05-11. Service bulletin. EQUIPMENT. TT: Some customers who have upgraded their iPhone® to iOS13 are experiencing a condition where the Bluetooth connection disconnects and reconnects. In some instances, this condition causes the Panasonic head unit to reboot when the Bluetooth connection is initiated.
T-SB-0304-17 Obs2020-05-11. Service bulletin. EQUIPMENT. TSB: OBSOLETE NOTICE April 07, 2020: This bulletin is now obsolete. Please see T-SB-0032-20. Replacement Certification Labels and VIN Plates
T-SB-0032-202020-05-11. Service bulletin. EQUIPMENT. TSB: SUPERSESSION NOTICE The information contained in this bulletin supersedes Service Bulletin Nos. PG021-88, PG015-89, PG0015-90, PG002-91, PG002-93, PG005-97, PG007-01, PG007-07, PG006-01, PG004-97, T-SB-0144-08, and T-SB-0304-17. The aforementioned bulletins are obsolete, and any printed versions should be discarded. Replacement certification labels (the vinyl label installed on the driver door or door post) and VIN plates (the metal plate riveted to dashboard) (see Figure 1) for most 1979 ? 2020 model year vehicles may be available provided the requests meet the criteria listed in this Service Bulletin. Follow the Procurement Procedure in this bulletin to request a replacement certification label or VIN plate.
T-TT-0600-202020-03-30. Service bulletin. EQUIPMENT:ELECTRICAL. 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-0528-19_Rev2020-03-30. Service bulletin. WHEELS. TT: Some 2014-2020 model year Highlander and Highlander HV vehicles are equipped with alloy wheels that are clad with a plastic cover. Use of a heat gun to facilitate removal of stick-on wheel weights may damage the coating on the cladding and cause it bubble and/or peel off
T-TT-0598-202020-03-30. Service bulletin. EQUIPMENT. TT: Some vehicles may experience a ?New software is not compatible with the system.? Pop-up while performing T-SB-0003-20 during the head unit software installation process
Oil Cooler Pipe2020-03-09. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; ENGINE. Technical Instructions: TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 19TC04 OIL COOLER PIPE CERTAIN 2017 ? 2019 HIGHLANDER HV
Parts HotWire 202020-03-09. Service bulletin. ENGINE; EQUIPMENT; ENGINE AND ENGINE COOLING. Dealer Message: Parts Hotwire. In an effort to assist dealers in performing campaign 19TC04 on a customer?s first visit, Toyota is deploying stock of part number 04009-40131 (PIPE KIT, OIL COOLER) to all dealers. Dealers will receive enough parts to repair two days-worth of their peak demand based on the quantity of vehicles registered in the dealer?s area. Peak demand has been estimated based on historical campaign demand. Dealers should continue to place orders following the CPOR process for this campaign to replenish their stock. For additional details on the CPOR process, refer to the MAC report. Parts are stocked at the Parts Distribution Centers and are available in two days from order placement. NOTE: All dealers will receive a minimum of 1 piece.
19TC04 - DD - Pu2020-03-09. Service bulletin. ENGINE; EQUIPMENT. Dealer Daily Message: **Dealer Letter and Technical Instructions Available on TIS** Certain 2017 ? 2019 Model Year Highlander HV ? Special Service Campaign 19TC04 Dealer Letter and Technical Instructions now available on TIS.
19TC04 - FAQ - P2020-03-09. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE. Frequently Asked Questions. The involved vehicles are equipped with an engine oil cooling system. The oil cooling system could experience a small leak due to a manufacturing issue. If a vehicle is continuously operated with this condition, it may result in abnormal engine noise, illumination of the Malfunction Indicator Light (MIL), and an engine oil level low message. Over time, an oil pressure warning message may be displayed on the multi-information display and/or a buzzer may sound.
19TC04 - TI_01.32020-03-09. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING. Technical Instructions: TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 19TC04 OIL COOLER PIPE CERTAIN 2017 ? 2019 HIGHLANDER HV
19TC04 - Dealer2020-03-09. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE. Dealer Package: The involved vehicles are equipped with an engine oil cooling system. The oil cooling system could experience a small leak due to a manufacturing issue. If a vehicle is continuously operated with this condition, it may result in abnormal engine noise, illumination of the Malfunction Indicator Light (MIL), and an engine oil level low message. Over time, an oil pressure warning message may be displayed on the multi-information display and/or a buzzer may sound.
19TC04 -Region L2020-03-09. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING. Region Letter: The involved vehicles are equipped with an engine oil cooling system. The oil cooling system could experience a small leak due to a manufacturing issue. If a vehicle is continuously operated with this condition, it may result in abnormal engine noise, illumination of the Malfunction Indicator Light (MIL), and an engine oil level low message. Over time, an oil pressure warning message may be displayed on the multi-information display and/or a buzzer may sound.
19TC04 - Dealer2020-03-09. Service bulletin. ENGINE; ENGINE AND ENGINE COOLING. Dealer Email: The involved vehicles are equipped with an engine oil cooling system. The oil cooling system could experience a small leak due to a manufacturing issue. If a vehicle is continuously operated with this condition, it may result in abnormal engine noise, illumination of the Malfunction Indicator Light (MIL), and an engine oil level low message. Over time, an oil pressure warning message may be displayed on the multi-information display and/or a buzzer may sound.
19TC04 - Region2020-03-09. Service bulletin. ENGINE AND ENGINE COOLING; ENGINE. Region Email: The involved vehicles are equipped with an engine oil cooling system. The oil cooling system could experience a small leak due to a manufacturing issue. If a vehicle is continuously operated with this condition, it may result in abnormal engine noise, illumination of the Malfunction Indicator Light (MIL), and an engine oil level low message. Over time, an oil pressure warning message may be displayed on the multi-information display and/or a buzzer may sound.
T-TT-0520-19_Rev2020-02-18. Service bulletin. EQUIPMENT. TT: In certain cases of leaking air conditioning systems, the root cause of the leak is inadvertently overlooked, causing a repeat repair. To improve customer satisfaction and repair A/C system leaks in one dealer visit, Toyota has developed a set of guidelines for evaluating A/C system components.
T-SB-0279-17_Obs2020-02-18. Service bulletin. EQUIPMENT. TSB: OBSOLETE NOTICE January 13, 2020: This bulletin is now obsolete. Please see T-SB-0003-20.

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