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Service bulletins for the 2015 Toyota Sienna

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.

347 on file from NHTSA, as of 2026-10-19.

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Bulletins, newest first
T-TT-0356-15 REV2017-03-02. Service bulletin. STRUCTURE:BODY:DOOR; LATCHES/LOCKS/LINKAGES. TT: SLIDING DOOR WILL NOT LATCH IN THE CLOSED POSITION DUE TO EITHER FRONT AND/OR REAR LOCK MALFUNCTIONING. PLEASE SEE LINK REFERENCES OF VIDEO FOR EXAMPLE CONDITION AND DIAGNOSIS INSTRUCTION.
T-TT-0377-152017-03-02. Service bulletin. EQUIPMENT. 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.
T-TT-0374-152017-03-02. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); EQUIPMENT. "TT: SINCE MY 2011, SEVERAL DIFFERENT UPDATE OR UPGRADE USB SST'S HAVE BEEN ISSUED FOR TOYOTA AUDIO AND NAVIGATION SYSTEM. REFER TO THE CHART BELOW FOR A COMPREHENSIVE LIST OF ALL CURRENT AND PREVIOUSLY ISSUED USB SSTS AND THEIR APPLICABILITY. "
T-SB-0180-12 REV2017-03-02. Service bulletin. SEATS:MID/REAR ASSEMBLY. TSB: DECEMBER 2, 2015: THIS BULLETIN IS NOW OBSOLETE. PLEASE SEE T-SB-0118-15.
T-SB-0118-152017-03-02. Service bulletin. SEATS:MID/REAR ASSEMBLY. TSB: SOME 2011 – 2015 MODEL YEAR SIENNA VEHICLES MAY EXHIBIT A CONDITION WHERE THE DRIVER SIDE 2ND ROW SEAT WITH THE TIP-UP STYLE LOWER SEAT CUSHION HAS EXCESSIVE UP AND DOWN MOVEMENT. WHILE SOME SEAT MOVEMENT IS A NORMAL CHARACTERISTIC OF THE DESIGN, THIS BULLETIN WILL HELP IDENTIFY EXCESSIVE MOVEMENT AND PROVIDE STEPS TO ADDRESS THIS CONDITION.
T-TT-0385-162017-03-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. "TECH TIP: THIS TECH TIP IS BEING PROVIDED TO BRING ATTENTION TO THE NEW LOCATION OF THE ENTUNE/NAV/MAP UPDATE AND UPGRADE USB DIRECTORY. CLICK ON THE TIS TAB, DIAGNOSTICS TAB, TELEMATICS TAB, AND THE DOCUMENT IS NOW LOCATED UNDER THE REFERENCE DOCUMENTS SECTIONS. THIS CHANGE HAS OCCURRED TO HELP SPEED UP THE UPDATING PROCESS OF THIS DOCUMENT. "
T-SB-0035-162017-02-23. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; EQUIPMENT. TSB: SOME 2014 MODEL YEAR APPLICABLE VEHICLES EQUIPPED WITH ENTUNE™ AUDIO (VERSION 010169) / ENTUNE™ AUDIO PLUS (VERSION 010171) / ENTUNE™ PREMIUM AUDIO (VERSION 010185) MAY EXHIBIT ONE OR MORE OF THE FOLLOWING CONDITIONS.
T-SB-0026-162017-02-23. Service bulletin. VEHICLE SPEED CONTROL; EQUIPMENT. TSB: SOME 2014 - 2016 SIENNA VEHICLES MAY EXHIBIT AN INTERMITTENT CRUISE CONTROL STALK ILLUMINATION FLICKER CONDITION. PLEASE FOLLOW THE REPAIR PROCEDURE IN THIS BULLETIN TO ADDRESS THIS CONDITION.
G0G_TI_SIENNA2017-02-15. Service bulletin. EQUIPMENT. TECHNICAL INSTRUCTIONS: THE SUBJECT VEHICLES ARE EQUIPPED WITH AN OXYGEN SENSOR WHICH COULD EXPERIENCE WIRE DEGRADATION INSIDE THE OXYGEN SENSOR WIRING HARNESS CAUSED BY VEHICLE VIBRATION DURING NORMAL OPERATION. IF THIS OCCURS, THE VEHICLE WILL ILLUMINATE THE CHECK ENGINE LIGHT.
T-SB-0049-16 REV2017-01-04. Service bulletin. ELECTRICAL SYSTEM. TSB: SOME 2015 – 2016 MODEL YEAR AVALON, CAMRY, SIENNA, AND TUNDRA VEHICLES EQUIPPED WITH BLIND SPOT MONITOR MAY EXHIBIT A BLIND SPOT MONITOR WARNING MESSAGE WITH DIAGNOSTIC TROUBLE CODE (DTC) C1AB2 SHORT TO GROUND IN OUTER MIRROR INDICATOR (MASTER) OR C1AB3 SHORT TO GROUND IN OUTER MIRROR INDICATOR (SLAVE) STORED. FOLLOW THE REPAIR PROCEDURE IN THIS BULLETIN TO ADDRESS THIS CONDITION.
G0G_TI2016-12-20. Service bulletin. ELECTRICAL SYSTEM; ENGINE. TECHNICAL INSTRUCTIONS: THE SUBJECT VEHICLES ARE EQUIPPED WITH AN OXYGEN SENSOR WHICH COULD EXPERIENCE WIRE DEGRADATION INSIDE THE OXYGEN SENSOR WIRING HARNESS CAUSED BY VEHICLE VIBRATION DURING NORMAL OPERATION. IF THIS OCCURS, THE VEHICLE WILL ILLUMINATE THE CHECK ENGINE LIGHT.
T-SB-0049-16 REV2016-12-14. Service bulletin. EQUIPMENT. TSB: SOME 2015 – 2016 MODEL YEAR AVALON, CAMRY, SIENNA, AND TUNDRA VEHICLES EQUIPPED WITH BLIND SPOT MONITOR MAY EXHIBIT A BLIND SPOT MONITOR WARNING MESSAGE WITH DIAGNOSTIC TROUBLE CODE (DTC) C1AB2 SHORT TO GROUND IN OUTER MIRROR INDICATOR (MASTER) OR C1AB3 SHORT TO GROUND IN OUTER MIRROR INDICATOR (SLAVE) STORED. FOLLOW THE REPAIR PROCEDURE IN THIS BULLETIN TO ADDRESS THIS CONDITION.
OP-W-04222016-11-16. Service bulletin. STRUCTURE:BODY:DOOR. THIS SB NOTIFIES THE TECHNICIANS OF THE AVAILABILITY OF AN UPGRADED DOOR OPEN LIMIT SWITCH. IT'S MORE ROBUST DESIGN MAKES IT EASIER TO ADJUST AND HOLDS THE ADJUSTMENT IN PLACE REDUCING OR ELIMINATING INCORRECT SIGNALLING TO THE VMI AND OEM COMPUTER CONCERNING THE STATUS OF THE PASS. SIDE SLIDING DOOR
T-SB-0045-14 REV2016-11-16. Service bulletin. SERVICE BRAKES. "TSB: REVISION NOTICE - AUGUST 2, 2016 REV1 - APPLICABILITY HAS BEEN UPDATED TO INCLUDE 2015 - 2016 MODEL YEAR SIENNA VEHICLES. ANY PREVIOUS PRINTED VERSIONS OF THIS BULLETIN SHOULD BE DISCARDED. SOME 2011 – 2016 MODEL YEAR SIENNA VEHICLES MAY EXHIBIT A VIBRATION/PULSATION FROM THE FRONT BRAKES THAT CAN BE FELT IN THE BRAKE PEDAL WHILE LIGHTLY APPLYING THE BRAKE PEDAL. NEW FRONT BRAKE PADS AND A NEW FIELD FIX REPAIR PROCEDURE HAVE BEEN DEVELOPED TO IMPROVE THIS CONDITION. "
11-26-20142016-04-12. Service bulletin. EQUIPMENT. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
TSB-0123-142016-03-31. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
T-SB-0124-142016-03-31. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
T-SB-0122-142016-03-31. Service bulletin. EQUIPMENT. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
T-SB-0117-142016-03-31. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
T-SB-0023-142016-03-31. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. SUMMARY TO BE PROVIDED ON A FUTURE DATE.
TSB-0007-152015-10-31. Service bulletin. EQUIPMENT. TOYOTA: SOME VEHICLES NEED UPDATED CLEARANCE WARNING COMPUTER TO RESOLVE PARKING ASSIST CUSTOMIZE SETTINGS THAT WILL NOT BE CHANGED THROUGH DISPLAY OF RADIO. MODEL 2015 SIENNA. *PE
T-SB-0007-152015-06-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TOYOTA SIENNA 2015: INFORMATION REGARDING PARKING ASSIST CUSTOMIZABLE SETTINGS NOT CHANGING THROUGH RADIO DISPLAY. *LJ

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.