2021 Subaru Ascent Technical Service Bulletins

384 technical service bulletins (TSBs) are on record for the 2021 Subaru Ascent. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10232227Feb 20, 2023Equipment, Electrical system. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2022 model year Ascent vehicles.
• 10232225Feb 20, 2023Electrical system, Engine cooling. This bulletin announces the availability of new reprograming files for the Engine Control Module (ECM).
• 10232218Feb 10, 2023Equipment, Electrical system. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands.
• 10232214Feb 7, 2023Equipment, Electrical system. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed.
• 10231298Jan 30, 2023Equipment, Electrical system. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2022 model year Ascent vehicles.
• 10231314Jan 24, 2023Electrical system, Equipment. WRL-22 PTC Heater Ground Bolt left side sill cover removal.
• 10231299Jan 12, 2023Transmission and drivetrain. This Service Information Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models listed.
• 10231293Jan 12, 2023Engine cooling. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10231280Jan 5, 2023Equipment, Electrical system. UPDATE Safety Recall: WRL-22 PTC Heater Ground Bolt (Owner notification)
• 10228783Dec 15, 2022Equipment, Electrical system. "Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2022 model year Ascent vehicles. (PTC Heater)"
• 10228784Dec 13, 2022Electrical system, Equipment. Service, Parts, and Claim Instructions For detailed service, parts, and claim instructions, please refer to the WRL-22 Product Campaign Bulletin which is now available on STIS.
• 10228778Dec 9, 2022Equipment, Electrical system. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2022 model year Ascent vehicles. (WRL-22)
• 10226904Nov 17, 2022Transmission and drivetrain. This Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models listed.
• 10226867Nov 17, 2022Equipment, Electrical system. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed.
• 10226863Nov 17, 2022Electrical system, Equipment. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressin customer concerns.
• 10226855Nov 16, 2022Transmission and drivetrain. This communication announces a new procedure for retailers to follow in the event their WRK-21 videoscope requires service or replacement.
• 10226841Nov 9, 2022Electrical system, Equipment. This Bulletin provides additional procedures and a detailed flow chart to use when diagnosing customer concerns regarding operation of the STARLINK RES feature.
• 10226833Nov 2, 2022Electrical system, Equipment. This Bulletin provides additional information for the diagnostic procedures concerning measurement of Dark Current (a.k.a. Standby Current).
• 10225766Oct 18, 2022Electrical system, Equipment. This Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 10225744Oct 3, 2022Equipment, Electrical system. This bulletin is being released as guidance for proper testing and charging of vehicle batteries.
• 10225740Oct 3, 2022Suspension. This bulletin announces a design change made to the front stabilizer bushings.
• 10225733Oct 3, 2022Equipment, Electrical system. This Bulletin provides additional information for the diagnostic procedures concerning measurement of Dark Current (a.k.a. Standby Current).
• 10222367Sep 27, 2022Engine cooling. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components.
• 10222342Sep 14, 2022Transmission and drivetrain. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10222338Sep 6, 2022Equipment, Electrical system. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected.
• 10219496Aug 26, 2022Engine cooling. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers).
• 10219499Aug 23, 2022Electrical system, Latches, locks and linkages. This Service Information Bulletin provides additional information for the diagnostic procedures concerning measurement of Dark Current (a.k.a. Standby Current).
• 10219492Aug 23, 2022Equipment. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 10219491Aug 23, 2022Equipment, Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure.
• 10219490Aug 23, 2022Equipment. The purpose of this bulletin is to provide a description of current changes to Service Manuals available via the Subaru Technical Information System (STIS) web site.
• 10219477Aug 12, 2022Electrical system, Equipment. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed.
• 10219476Aug 12, 2022Equipment. Special Edition, 2012 current model subaru evaporative diagnostics and smoke testing.
• 10219474Aug 9, 2022Equipment, Electrical system. This Bulletin provides additional procedures and a detailed flow chart to use when diagnosing customer concerns regarding operation of the STARLINK RES feature.
• 10219471Aug 2, 2022Electrical system. This bulletin announces the repair procedures for the left and right-side horns to address DTC B1610 (Front Sub Sensor RH Failure) detected when the horns are operated shortly after engine start up.
• 10216984Jul 12, 2022Equipment, Transmission and drivetrain. This Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models listed.
• 10216981Jul 11, 2022Electrical system, Equipment, Other or unknown. This Bulletin announces the preferred practices to be used when handling vehicles equipped with Gen2 Telematics which are enrolled in the Subaru STARLINK® Security Plus Service featuring Stolen Vehicle Recovery Plus with Immobilizer.
• 10216977Jul 8, 2022Equipment, Electrical system, Transmission and drivetrain. The WRK-21 recall includes TCM reprogramming to prevent CVT chain slip. If, during the recall inspection, a vehicle is confirmed to have already experienced severe enough CVT chain slip, the CVT assembly will be replaced.
• 10216969Jul 5, 2022Suspension, Equipment. This bulletin announces a design change made to the front stabilizer bushings.
• 10215432Jun 29, 2022Engine cooling, Electrical system. This bulletin announces availability of new reprograming files for the Engine Control Module (ECM).
• 10215427Jun 27, 2022Equipment, Electrical system. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed.
• 10215420Jun 27, 2022Equipment, Electrical system. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected.
• 10213187May 17, 2022Electrical system. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units.
• 10213174May 9, 2022Electrical system, Equipment. This bulletin announces the Service Manual correction for the diagnostic trouble tree for DTC B281C.
• 10210827Apr 26, 2022Equipment, Engine cooling, Transmission and drivetrain. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10210810Apr 6, 2022Equipment. The purpose of this bulletin is to provide a description of current changes to Service Manuals available via the Subaru Technical Information System (STIS) web site.
• 10209937Mar 29, 2022Electrical system, Equipment, Engine cooling. This bulletin announces the proper diagnostic procedures regarding oil leakage from the oil level switch area.
• 10209915Mar 18, 2022Electrical system. This bulletin has been developed to outline the steps for gathering basic essential information during diagnosis and repair of the Infotainment concerns. (Applicable to all models with Harman or Denso CP1 Infotainment).
• 10209914Mar 9, 2022Transmission and drivetrain. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10209913Mar 2, 2022Electrical system. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
• 10208689Feb 28, 2022Electrical system, Equipment. This bulletin provides helpful tips to better utilize the Subaru Select Monitor 4.

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