NHTSA ID Number: 11037198
Manufacturer Communication Number: T-SB-0049-26
TSB/Document Date: 2026-09-09
Summary
Some 2022 – 2025 model year Tundra Hybrid, 2023 – 2025 model year Sequoia Hybrid, 2024 –2025 Land Cruiser and Tacoma Hybrid, and 2025 4Runner Hybrid vehicles may exhibit a whine noise from the transmission when in Ready ON mode.
T-SB-0049-26
August 19, 2026
Whine Noise from Transmission in Ready ON Mode
Service
Category
Drivetrain
Market USA and
Section
Mexico
Automatic Transmission
/Transaxle
Applicability
YEAR(S)
MODEL(S)
2025
4Runner HV
2024 - 2025
Land Cruiser, Tacoma HV
2023 - 2025
Sequoia HV
2022 - 2025
Tundra HV
ADDITIONAL INFORMATION
Introduction
Some 2022 – 2025 model year Tundra Hybrid, 2023 – 2025 model year Sequoia Hybrid, 2024 –
2025 Land Cruiser and Tacoma Hybrid, and 2025 4Runner Hybrid vehicles may exhibit a whine
noise from the transmission when in Ready ON mode. Follow the Repair Procedure in this bulletin
to address this condition.
© 2026 Toyota Motor Sales, USA
Page 1 of 7
T-SB-0049-26
August 19, 2026
Page 2 of 7
Whine Noise from Transmission in Ready ON Mode
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs
shown below.
MODEL
PLANT
DRIVETRAIN
4Runner HV
PRODUCTION CHANGE EFFECTIVE VIN
JTEVB5BR#S5009687
Tahara
Land Cruiser
JTEABFAJ#75019817
Sequoia HV
TMMTX
7SVAAAAA#SX004488
7SVAAABA#SX070814
Tacoma HV
TMMGT
3TYLC5LN#ST039701
3TYLF5LN#ST039701
TMMTX
5TFWC5ABSX004096
5TFJC5AB#SX004096
5TFNC5AB#SX004096
5TFMC5AB#SX004096
5TFJC5BC#SX001211
5TFWC5BC#SX001211
5TFMC5BC#SX001211
5TFNC5BC#SX001211
5TFJC5DB#SX111896
5TFPC5DB#SX111896
5TFWC5DB#SX111896
5TFVC5DB#SX111896
5TFNC5DB#SX111896
5TFWC5DB#SX111896
5TFMC5DB#SX111896
5TFWC5EC#SX010315
5TFJC5EC#SX010315
5TFNC5EC#SX010315
5TFMC5EC#SX010315
5TFWC5EC#SX010315
2WD/4WD
Tundra HV
© 2026 Toyota Motor Sales, USA
T-SB-0049-26
August 19, 2026
Page 3 of 7
Whine Noise from Transmission in Ready ON Mode
Warranty Information
For USA Market
OP CODE
DESCRIPTION
MODEL
TIME
Tundra HV
Sequoia HV
TC2604
R & R Oil Pump w/ Motor
Land Cruiser
4Runner HV
Tacoma HV
OFP
T1
T2
91
99
35300-34010
1.9
35300-04010
APPLICABLE WARRANTY
• This repair is covered under the Toyota Basic Warranty. This warranty is in effect for
36 months or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
• Warranty application is limited to occurrence of the specified condition described in
this bulletin.
• For 2025 model year 4Runner HV, 2024 – 2025 model year Land Cruiser and Tacoma HV,
2023 – 2025 model year Sequoia HV, and 2022 – 2025 model year Tundra HV vehicles equipped
with a California Certified Emission Control System that are registered and operated in
California or any state that adopts California emission warranty — California Emission
Long-Term Defect Warranty is in effect for 7 years or 70,000 miles from the vehicle’s in-service
date, whichever occurs first. (Please reference Policy 4.7, and/or the Owner’s Warranty &
Maintenance Guide for additional information)
For Mexico Market
OP CODE
DESCRIPTION
MODEL
TIME
Tundra HV
Sequoia HV
TC2604
R & R Oil Pump w/ Motor
Land Cruiser
4Runner HV
Tacoma HV
OFP
T1
T2
91
99
35300-34010
1.9
35300-04010
APPLICABLE WARRANTY
• This repair is covered under the Toyota Basic Warranty. This warranty is in effect for
36 months or 60,000 kilometers, whichever occurs first, from the vehicle’s in-service date.
• Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2026 Toyota Motor Sales, USA
T-SB-0049-26
August 19, 2026
Page 4 of 7
Whine Noise from Transmission in Ready ON Mode
Parts Information
MODEL
PART NUMBER
Sequoia HV
Tundra HV
35300-34010
PART NAME
QTY
1
Pump Assy, Oil w/ Motor
4Runner HV
Land Cruiser
Tacoma HV
35300-04010
1
Sequoia HV
Tundra HV
35168-0C020
1
Transmission Oil Pan Gasket
4Runner HV
Land Cruiser
Tacoma HV
35168-60050
All Models
00289-ATFWS
1
5 US qts
(4.8 liters)
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream Lite
PART NUMBER
QTY
TSADVUNITECP
ADE
Techstream Lite (Green Cable)
TSLP3DLR01
TSLP2DLR01
*Essential SST
NOTE
• Only ONE of the Techstream units listed above is required.
• GTS+ sof tware version 2026.03.002.02 or later is required.
• Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 (USA) or +(525) 5550 10 3000 (Mexico) or by visiting TIS – Diagnostics –
Tools & Equipment – Techstream Order Portal.
© 2026 Toyota Motor Sales, USA
1
T-SB-0049-26
August 19, 2026
Page 5 of 7
Whine Noise from Transmission in Ready ON Mode
Repair Procedure
1. Confirm the condition exists.
Does the vehicle exhibit a whine noise from the transmission when in Ready ON mode?
•
YES — Continue to step 2.
•
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Remove the transmission oil pan and oil pump.
Refer to TIS, applicable model and model year Repair Manual.
•
2025 4Runner HV:
Drivetrain – L580F (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Removal
NOTE
Perf orm ONLY steps 1 – 5.
•
2024 – 2025 Land Cruiser:
Drivetrain – L580F (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Removal
NOTE
Perf orm ONLY steps 1 – 5.
•
2023 – 2025 Sequoia HV:
Drivetrain – L4A0E (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Removal
NOTE
Perf orm ONLY steps 1 – 6.
•
2024 – 2025 Tacoma HV:
Drivetrain – L580F (Hybrid Transmission / Transaxle) –
Valve Body Assembly (For Transmission Side) – Removal
NOTE
Perf orm ONLY steps 1 – 5.
© 2026 Toyota Motor Sales, USA
T-SB-0049-26
August 19, 2026
Whine Noise from Transmission in Ready ON Mode
Repair Procedure (continued)
•
2022 – 2025 Tundra HV:
Drivetrain – L4A0E (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Removal
NOTE
Perf orm ONLY steps 1 – 6.
3. Install the NEW transmission oil pump and reinstall the oil pan.
Refer to TIS, applicable model and model year Repair Manual.
•
2025 4Runner HV:
Drivetrain – L580F (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Installation
NOTE
Perf orm ONLY steps 3 – 8.
•
2024 – 2025 Land Cruiser:
Drivetrain – L580F (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Installation
NOTE
Perf orm ONLY steps 3 – 8.
•
2023 – 2025 Sequoia HV:
Drivetrain – L4A0E (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Installation
NOTE
Perf orm ONLY steps 2 – 8.
•
2024 – 2025 Tacoma HV:
Drivetrain – L580F (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Installation
NOTE
Perf orm ONLY steps 3 – 8.
© 2026 Toyota Motor Sales, USA
Page 6 of 7
T-SB-0049-26
August 19, 2026
Whine Noise from Transmission in Ready ON Mode
Repair Procedure (continued)
•
2022 – 2025 Tundra HV:
Drivetrain – L4A0E (Hybrid Transmission / Transaxle) –
Valve Body Assembly (for Transmission Side) – Installation
NOTE
Perf orm ONLY steps 2 – 8.
4. Start the vehicle and confirm the condition has been resolved.
© 2026 Toyota Motor Sales, USA
Page 7 of 7
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TSB/Document ID: T-SB-0049-26
Replacement Service Bulletin Number:
MFR Communication Date: 2026-08-19
MFR Internal Campaign ID/Software Version: T-SB-0049-26
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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