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Service bulletin T-TT-0574-19

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 id10166024
Published by NHTSA2019-10-15
Manufacturer's numberT-TT-0574-19
Manufacturer's date2019-09-18
NHTSA componentEQUIPMENT; ELECTRICAL SYSTEM

NHTSA's summary

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.

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, Equipment and accessories

Vehicles listed
TOYOTA 4RUNNER2014, 2015, 2016, 2017, 2018, 2019
TOYOTA AVALON2015, 2016, 2017, 2018
TOYOTA CAMRY2014, 2015, 2016, 2017
TOYOTA COROLLA2014, 2015, 2016, 2017, 2018, 2019
TOYOTA HIGHLANDER2014, 2015, 2016, 2017, 2018, 2019
TOYOTA MIRAI2016, 2017
TOYOTA PRIUS2016, 2017, 2018, 2019
TOYOTA PRIUS C2015, 2016, 2017
TOYOTA PRIUS PRIME2019 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA PRIUS V2015, 2016, 2017
TOYOTA PRIUS V2018 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA RAV42014, 2015, 2016, 2017, 2018
TOYOTA RAV4 HYBRID2017 (the catalog's model; the bulletin names a series or trim of it)
TOYOTA SEQUOIA2015, 2016, 2017, 2018, 2019
TOYOTA SIENNA2015, 2016, 2017
TOYOTA TACOMA2014, 2015, 2016, 2017, 2018, 2019
TOYOTA TUNDRA2014, 2015, 2016, 2017, 2018, 2019
TOYOTA VENZA2015
TOYOTA YARIS2018, 2019
TOYOTA redundant RAV4 HV2016

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

Recalls for the same vehicles and component
25V8760002025-12-17. EQUIPMENT ADAPTIVE/MOBILITY:WHEELCHAIR RESTRAINTS/SECUREMENT:LATCH/ANCHOR:
20235892023-11-01. Electrical
23V7340002023-11-01. ELECTRICAL SYSTEM:12V/24V/48V BATTERY
20217232021-11-24. Electrical
21V6880002021-09-02. EXTERIOR LIGHTING:HEADLIGHTS; ELECTRICAL SYSTEM:WIRING
20V4100002020-07-15. EXTERIOR LIGHTING:TURN SIGNAL; ELECTRICAL SYSTEM:WIRING
20202842020-06-25. Electrical
19V8760002019-12-11. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
20194342019-08-28. Electrical
20194282019-08-23. Accessories

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
T-SB-0106-22 Rev22026-02-11. Service bulletin. OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
T-SB-0001-262026-02-11. Service bulletin. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.
T-TT-0790-252025-09-09. Service bulletin. 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.
T-SB-0010-24 Rev22025-07-10. Service bulletin. Some 2021 – 2022 model year Avalon, 2018 – 2024 Camry, 2019 – 2025 model year Corolla, 2022 – 2025 model year Corolla Cross, and 2019 – 2025 model year RAV4 vehicles with A25A-FKS and M20A-FKS engines may have a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs) upon cold soak start up with engine coolant temperatures between 14°F – 41°F: •P030027 – Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold •P030000 – Random/Multiple Cylinder Misfire Detected •P030100 – Cylinder 1 Misfire Detected •P030200 – Cylinder 2 Misfire Detected •P030300 – Cylinder 3 Misfire Detected •P030400 – Cylinder 4 Misfire Detected
21TG012025-07-10. Service bulletin. Campaign Expired - replaced with campaign 23TA13TECHNICAL INSTRUCTIONS FOR CONSUMER ADVISORY 21TG01 12-VOLT BATTERY SIZE AND INSTALLATION INSPECTION CERTAIN 2013 – 2018 RAV4
21TG012025-07-10. Service campaign. 21TG01 Exprired - Replaced with Campaign 23TA13 During a recent investigation of reported battery fires in 2013-2018 RAV4 vehicles with gasoline engines (excluding hybrid models), Toyota discovered that many non-Toyota retailers and others who sell or install replacement batteries were recommending a small size battery for replacement. Toyota specifies a particular size replacement battery for the RAV4 that does not include this small size. The smaller battery may not fit securely with the RAV4’s battery mounting parts, and, in some cases, can move around when the vehicle is driven, causing a short circuit. Using the wrong size battery, or not installing a replacement battery properly, can cause damage to the battery and the vehicle, and it could cause a vehicle fire.
T-SB-0058-23 Rev12025-07-10. Service campaign. The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.
T-TT-0780-252025-06-06. Service bulletin. To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE.
T-TT-0780-252025-05-15. Service bulletin. To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE.
T-SB-0106-22 Rev22025-04-08. Service bulletin. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic 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.