NHTSA ID Number: 11027561
Manufacturer Communication Number: T-SB-0093-25
TSB/Document Date: 2026-01-09
Summary
Some 2024 – 2025 model year 4WD Tacoma and Tacoma Hybrid vehicles may exhibit a condition where the 4WD lights are flashing and a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs) present: •P277111 – Four Wheel Drive (4WD) Low Switch Circuit Short to Ground •P178462 – 4WD/AWD Transfer Case Shift Motor Limit Switch and Transfer Case H4-L4 Position Switch Signal Compare Failure •P17AC62 – 4WD/AWD Transfer Case Shift Motor Limit Switch Signal Compare Failure The transfer case breather hose has been updated.
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TSB/Document ID: T-SB-0093-25
Replacement Service Bulletin Number:
MFR Communication Date: 2025-12-17
MFR Internal Campaign ID/Software Version: T-SB-0093-25
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE:BODY
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
09951-07150
1
09308-00010
1
Seal Ring Tool*
09631-12090
1
Replacer 60*
09951-00600
1
Handle Assembly - 4.25”*
09951-07100
1
Replacer 41*
09951-00410
1
Replacer 57*
09951-00570
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-368-6787 (USA) or +(525) 5550 10 3000 (Mexico) or by
visiting Home – Service Resources – Toyota Tools and Equipment Program.
© 2025 Toyota Motor Sales, USA
T-SB-0093-25
December 17, 2025
Page 6 of 10
Flashing 4WD Lights and MIL ON with DTC P277111, P178462 and/or P17AC62
Required Tools & Equipment (continued)
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream Lite
PART NUMBER
QTY
TSADVUNITECP
ADE
Techstream Lite (Green Cable)
TSLITEPDLR01
1
TSLP3DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2025.04.002.02 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.
Repair Procedure
1. Confirm the Condition. Does the vehicle exhibit a condition where the 4WD lights are flashing
and a MIL ON condition with one or more of the following DTCs present:
P277111 – Four Wheel Drive (4WD) Low Switch Circuit Short to Ground
P178462 – 4WD/AWD Transfer Case Shift Motor Limit Switch and Transfer Case
H4-L4 Position Switch Signal Compare Failure
P17AC62 – 4WD/AWD Transfer Case Shift Motor Limit Switch Signal
Compare Failure
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2025 Toyota Motor Sales, USA
T-SB-0093-25
December 17, 2025
Page 7 of 10
Flashing 4WD Lights and MIL ON with DTC P277111, P178462 and/or P17AC62
Repair Procedure (continued)
2. Remove the transfer case.
Refer to TIS, applicable model and model year Repair Manual.
2024 – 2025 Tacoma and Tacoma HV:
Drivetrain – VF2DM (Transfer / 4WD / AWD) – Transfer Assembly – Removal
3. Replace the transfer case shift actuator.
Refer to TIS, applicable model and model year Repair Manual.
2024 – 2025 Tacoma and Tacoma HV:
Drivetrain – VF2DM (Transfer / 4WD / AWD) – Transfer Assembly – Disassembly
NOTE
Perform ONLY steps 1 – 8, 11, and 24.
4. Reassemble the transfer case.
Refer to TIS, applicable model and model year Repair Manual.
2024 – 2025 Tacoma and Tacoma HV:
Drivetrain – VF2DM (Transfer / 4WD / AWD) – Transfer Assembly – Reassembly
NOTE
Perform ONLY steps 7 and 20 – 30.
5. Install the transfer case.
Refer to TIS, applicable model and model year Repair Manual.
2024 – 2025 Tacoma and Tacoma HV:
Drivetrain – VF2DM (Transfer / 4WD / AWD) – Transfer Assembly – Installation
© 2025 Toyota Motor Sales, USA
T-SB-0093-25
December 17, 2025
Page 8 of 10
Flashing 4WD Lights and MIL ON with DTC P277111, P178462 and/or P17AC62
Repair Procedure (continued)
6. Install the NEW breather hose:
For manual transmission go to substep A.
For automatic transmission go to substep B.
For hybrid transmission go to substep C.
A. For a manual transmission, note the paint
mark color on the breather hose is white
(Hose Sub-Assy, Transfer Breather
36407-04111).
Figure 1. Manual Transmission Breather Hose
1
3
2
3
(1) Assemble the breather hose clamp
to the transmission bracket.
4
(2) Assemble the breather hose
assembly to the transmission
breather clamp.
(3) Assemble the breather hose clamp
to the transfer case bracket.
(4) Assemble breather hose to the wire
harness clamp.
6
5
1
8
(5) Insert the hose onto the transfer
case and actuator tube.
7
3
3
1
Paint Mark Color: White
2
Transmission Bracket
3
Breather Hose
4
Wire Harness Clamp
5
Transfer Case Bracket
6
Transmission Breather Clamp
7
Actuator Tube Insert
8
Transfer Case Tube Insert
© 2025 Toyota Motor Sales, USA
T-SB-0093-25
December 17, 2025
Page 9 of 10
Flashing 4WD Lights and MIL ON with DTC P277111, P178462 and/or P17AC62
Repair Procedure (continued)
B. For an automatic transmission, note the
paint mark color on the breather hose is
yellow (Hose Sub-Assy, Transfer
Breather 36407-04121).
Figure 2. Automatic Transmission Breather Hose
2
3
1
(1) Assemble the breather hose clamp to
the wire harness bracket.
7
(2) Assemble the breather hose clamp to
the wire harness.
(3) Assemble the breather hose clamp to
the rear side of the wire
harness clamp.
4
(4) Insert the hose onto the transfer case
and actuator tube.
5
6
1
Paint Mark Color: Yellow
2
Wire Harness Bracket
3
Breather Hose
4
Wire Harness
5
Wire Harness Clamp
6
Actuator Tube Insert
7
Transfer Case Tube Insert
© 2025 Toyota Motor Sales, USA
T-SB-0093-25
December 17, 2025
Page 10 of 10
Flashing 4WD Lights and MIL ON with DTC P277111, P178462 and/or P17AC62
Repair Procedure (continued)
C. For a hybrid transmission, note the paint
mark color on the breather hose is green
(Hose Sub-Assy, Transfer Breather
36407-04131).
Figure 3. Hybrid Transmission Breather Hose
3
2
1
(1) Assemble the breather hose clamp to
the wire harness bracket.
4
(2) Assemble the breather hose clamp to
the wire harness.
5
(3) Assemble the breather hose clamp to
the rear side of wire harness clamp.
(4) Insert the hose onto the transfer case
and actuator tube.
6
1
Paint Mark Color: Green
2
Wire Harness Bracket
3
Wire Harness
4
Breather Hose
5
Wire Harness Clamp
6
Actuator Tube Insert
7
Transfer Case Tube Insert
7. Using GTS+, clear ANY DTCs and test drive the vehicle to confirm the conditions are no
longer present.
© 2025 Toyota Motor Sales, USA
7
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