Service bulletin T-TT-0514-18

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10153202
Published by NHTSA	2019-02-19
Manufacturer's number	T-TT-0514-18
Manufacturer's date	2018-12-06
NHTSA component	POWER TRAIN

NHTSA's summary

TT: Intermittent high-pitched whine noise is heard when driving 45-70MPH.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline

Vehicles listed
TOYOTA 4RUNNER	2015, 2016, 2017, 2018, 2019

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
T-TT-0705-22 Rev	2022-10-17. Service bulletin. TT: If you see this condition, please create a TAS case and contact TAS for instruction prior to diagnosing or repairing of the vehicle. If it is a weekend or holiday, continue with diagnosis and repair. Please save all parts and/or details and contact TAS on the next available workday.
T-SB-0079-21	2021-10-25. Service bulletin. TSB: Some 2019 ? 2020 model year 4Runner vehicles may exhibit a grease leak from the edge of the inboard joint boot of a front drive shaft where the clamp is located. This condition may appear in vehicles with less than 25,000 miles with no apparent damage to the boot. Follow the Repair Procedure in this bulletin to address this condition.
T-SB-0134-16-Rev	2019-09-03. Service bulletin. TSB: REVISION NOTICE July 01, 2019 Rev2: ? Applicability has been updated to 2019 ? 2020 model year Toyota vehicles. ? The Techstream Preparation and Process Overview sections have been updated. October 30, 2017 Rev1: ? Applicability has been updated to include 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. SUPERSESSION NOTICE The information contained in this bulletin supersedes SB No. T-SB-0012-13. Service Bulletin No. T-SB-0012-13 is obsolete and any printed versions should be discarded. Be sure to review the entire content of this bulletin before proceeding. 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 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. NOTE ECU is a Toyota term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. For the purposes of this bulletin, the term ?ECU? is used as a generic label for the following SAE J1930 standard references: ? Powertrain Control Module (PCM) ? Engine Control Module (ECM) ? Transmission Control Module (TCM) ? Any other Toyota specific control unit
T-SB-0074-19	2019-09-03. Service bulletin. TSB: Some 2014 ? 2019 model year 4Runner vehicles may exhibit a whine or groan noise from the rear of the vehicle. This condition may occur while driving around 40 ? 60 mph at a consistent speed, slight acceleration, or slight deceleration. This condition may be caused by rear differential vibration transferring through the chassis and body. Follow the Repair Procedure in this bulletin to improve this condition.
T-SB-0012-19_Rev	2019-03-18. Service bulletin. TSB: REVISION NOTICE February 8, 2019 Rev1: ? The Warranty Information section has been updated. Any previous printed versions of this bulletin should be discarded. Some 2016 ? 2019 model year 4Runner 4WD vehicles may exhibit a cyclical groaning/grinding noise from the front differential in 2WD that is not present during 4WD operation. Follow the Repair Procedure in this bulletin to address this condition.
T-SB-0012-19	2019-02-19. Service bulletin. TSB: Some 2016 ? 2019 model year 4Runner 4WD vehicles may exhibit a cyclical groaning or grinding noise from the front differential in 2WD that is not present during 4WD operation. Follow the Repair Procedure in this bulletin to address this condition.
T-SB-0026-15_Rev	2018-07-16. Service bulletin. TSB: REVISION NOTICE June 8, 2018 Rev2: ? Applicability has been updated to exclude 2016 ? 2017 model year Tacoma vehicles. ? The Repair Procedure section has been updated. May 15, 2017 Rev1: ? Applicability has been updated to include 2016 ? 2017 model year Tacoma and 4Runner vehicles. ? The Introduction section has been updated. Any previous printed versions of this bulletin should be discarded. Some 2004 ? 2017 model year 4Runner vehicles, 2007 ? 2014 model year FJ Cruiser vehicles, and 2005 ? 2015 model year Tacoma vehicles equipped with part-time 4WD may exhibit a cyclical groaning or grinding noise coming from the front differential in 2WD that goes away when operated in 4WD. This noise can be addressed by replacing the needle bearing on the left side of the front differential. Refer to the Repair Procedure for needle bearing roller replacement instructions.
T-SB-0026-15	2017-08-14. Service bulletin. TSB: Some 2004 - 2015 model year Tacoma, FJ Cruiser, and 4Runner vehicles may exhibit a cyclical grinding or groaning noise coming from the front differential in 2WD that goes away when operated in 4WD. This noise can be addressed by replacing the needle bearing on the left side of the front differential. Refer to the Repair Procedure for Needle Bearing Roller replacement instructions.
T-SB-0110-15	2017-08-14. Service bulletin. TSB: Some 2015 model year Tacoma and 4Runner vehicles equipped with a 1GR-FE engine may exhibit a MIL "ON" condition with Diagnostic Trouble Code (DTC) P011B - Engine Coolant Temperature / Intake Air Temperature Correlation - when no part malfunction is present. The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition occurring. Use the following repair procedure to address this condition.
T-TT-0334-15	2017-08-14. Service bulletin. TT: Certain vehicles may exhibit a leak from the input shaft seal on the transfer case assembly. This leak is typically first identified by fluid collecting at the bottom of the seam between the transmission output and transfer case input mating surfaces.