2020 Subaru Ascent Technical Service Bulletins

530 technical service bulletins (TSBs) are on record for the 2020 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.

• 10222371Sep 30, 2022Transmission and drivetrain. Subaru of America, Inc. (Subaru) has initiated this safety and emissions Recall for certain 2019 - 2020 model year Ascent vehicles, 2020-2021 model year turbo Legacy vehicles, and 2020-2021 model year turbo Outback vehicles in which the Continuously Variable Transmission (CVT) chain may slip and/or break.
• 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.
• 10222364Sep 26, 2022Electrical system. Battery Class Action Settlement Resources. (2)
• 10222349Sep 20, 2022Transmission and drivetrain. An announcment regarding final phase of customer mailing for recall WRK 21.
• 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.
• 10222340Sep 6, 2022Equipment, Electrical system. This bulletin announces a warranty extension information regarding 12 Volt vehicle batteries.
• 10222338Sep 6, 2022Electrical system, Equipment. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected.
• 10222341Sep 1, 2022Electrical system, Equipment. Battery Drain Class Action Settlement- Warranty Extension Training.
• 10219500Aug 30, 2022Electrical system. Announcement to Subaru Retailers regarding the preliminary settlement in a class action lawsuit regarding battery drain in certain Subaru vehicles.
• 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).
• 10219486Aug 26, 2022Electrical system. This bulletin announces a warranty extension information regarding 12 Volt vehicle batteries.
• 10219473Aug 26, 2022Transmission and drivetrain. Subaru of America, Inc. (Subaru) has initiated this safety and emissions Recall for certain 2019 - 2020 model year Ascent vehicles, 2020-2021 model year turbo Legacy vehicles, and 2020-2021 model year turbo Outback vehicles in which the Continuously Variable Transmission (CVT) chain may slip and/or break.
• 10219499Aug 23, 2022Latches, locks and linkages, Electrical system. 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.
• 10219472Aug 5, 2022Transmission and drivetrain. Subaru of America, Inc. (Subaru) is initiating this safety and emissions Recall for certain 2019-2020 model year Ascent vehicles, 2020 model year turbo Legacy vehicles, and 2020 model year turbo Outback vehicles in which the Continuously Variable Transmission (CVT) chain may slip and/or break. Updates of Affected Vehicles and Owner Notification).
• 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.
• 10219466Aug 2, 2022Electrical system. REQUIRED Information for WRK-21 Service Claims.
• 10219465Aug 2, 2022Electrical system. The purpose of this communication is to assist retailers with questions or concerns regarding the OTC 16-3880X videoscopes, including repairs and replacement procedures.
• 10216996Jul 29, 2022Transmission and drivetrain, Electrical system, Equipment. Recently following the release of the WRK-21 CVT Chain Guide Breakage, SOA’s Techline started to receive some retailer inquiries regarding TCMs not accepting the testing/ temporary pak file or the final pak file and then failing to communicate.
• 10216971Jul 18, 2022Equipment, Transmission and drivetrain. Subaru of America, Inc. (Subaru) is initiating a new safety and emissions Recall for certain 2019 - 2020 model year Ascent vehicles, 2020 model year turbo Legacy vehicles, and 2020 model year turbo Outback vehicles in which the Continuously Variable Transmission (CVT) chain may slip and/or break.
• 10216984Jul 12, 2022Transmission and drivetrain, Equipment. 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, 2022Equipment, Electrical system, 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, 2022Electrical system, Transmission and drivetrain, Equipment. 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, 2022Electrical system, Equipment. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected.
• 10215410Jun 22, 2022Equipment, Transmission and drivetrain. WRK-21 rental pre-authorization.
• 10215409Jun 20, 2022Transmission and drivetrain. UPDATE Subaru Safety & Emissions Recall: WRK-21 – CVT Chain Guide Breakage.
• 10213197May 23, 2022Seats. This bulletin announces a design change made to the Slide Rail components of the left and right front power seat frame / track assembliesd.
• 10213193May 18, 2022Seat belts. This bulletin provides a procedure to address customer concerns of a squeaking sound originating from where the front seat belt buckle assembly attaches to the seat frame.
• 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.
• 10213184May 17, 2022Fuel system. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2020 MY Ascent, 2018-2019 MY BRZ, 2018 MY Forester (Turbo), 2018-2020 MY Impreza, 2018-2020 MY Legacy, 2018-2020 MY Outback, and 2018-2019 MY WRX vehicles in which the fuel pump may become inoperative.
• 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, 2022Equipment, Engine cooling, Electrical system. 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, 2022Equipment, Electrical system. This bulletin provides helpful tips to better utilize the Subaru Select Monitor 4.
• 10208661Feb 23, 2022Transmission and drivetrain. WRK-21 CVT Chain Guide Breakage Recall - Customer communications and rental.
• 10208662Feb 22, 2022Equipment, Electrical system. Map Data Update Procedure for Harman Gen 3.1 Navigation equipped Head Units (H/U).
• 10208688Feb 8, 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.
• 10208680Feb 7, 2022Suspension, Steering. Subaru of America, Inc. (Subaru) has initiated this safety recall for certain 2020 model year Ascent vehicles in which the front axle housings may have been manufactured with improperly tapered tie rod mounting holes.

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