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Service bulletin T-TT-0517-18_Rev

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)
TypeService bulletin
NHTSA id10164899
Published by NHTSA2019-09-16
Manufacturer's numberT-TT-0517-18_Rev
Manufacturer's date2019-08-12
NHTSA componentELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

TT: Voice navigation prompts and feedback beeps are inoperative after starting the engine. This condition only occurs on Platinum grade vehicles.

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

Electrical system, Software

Vehicles listed
TOYOTA HIGHLANDER2019
TOYOTA HIGHLANDER HYBRID2019 (the catalog's model; the bulletin names a series or trim of it)

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-0600-20 Rev2020-12-21. Service bulletin. 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.