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.

• 10237273May 11, 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.
• 10237254May 8, 2023Equipment, Air bags. This bulletin announces availability of the one-time use mounting clip and spacer clip for the air bag curtain module.
• 10237241May 4, 2023Engine cooling, Electrical system, Equipment. This Bulletin announces additional diagnostic procedures and a detailed flow chart to be used when diagnosing customer concerns regarding the operation of the STARLINK Remote Engine Start (RES) feature.
• 10237239May 2, 2023Equipment, Electrical system. This bulletin provides information on a new reprogramming procedure (FOTA) to optimize the Harman Gen 3.1 Audio and Navigation head units (H/U) utilized in the models as listed.
• 10235289Apr 27, 2023Transmission 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.
• 10235310Apr 26, 2023Transmission and drivetrain, Equipment, Electrical system. This bulletin announces availability of new reprograming files for the Transmission Control Module (TCM) to address judder a sensation possibly accompanied by a vibration-type sound when accelerating from slow speeds.
• 10235307Apr 25, 2023Engine cooling. This Service Information Bulletin announces a design change made to the Positive Crankcase Ventilation (PCV) hose assembly.
• 10235291Apr 17, 2023Latches, locks and linkages, Equipment. This Bulletin announces additional cautions being added to the Owner’s Manual and Service Manual regarding the operation of door locks.
• 10235285Apr 5, 2023Equipment, Electrical system. This Service Information Bulletin provides helpful procedures and best practices to utilize when customers present with concerns relating to the operation of their Gen 2/Gen 3 Telematics system equipped Subaru.
• 10235282Apr 5, 2023Equipment, Body and structure. This bulletin provides a repair procedure to address a small number of customer concerns of the hood panel surface vibrating while driving.
• 10233911Mar 27, 2023Electrical system. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands.
• 10233907Mar 23, 2023Equipment, Electrical system. This Bulletin provides reference tables and photos to use for determining the infotainment head unit supplier and generation.
• 10233895Mar 15, 2023Transmission and drivetrain, Electrical system. This bulletin announces availability of a new transmission harness for use when diagnosis of DTC P0842 -TRANSMISSION FLUID PRESSURE SENSOR / SWITCH “A” CIRCUIT LOW determines the sensor itself is OK but the transmission wiring harness is NG.
• 10233886Mar 15, 2023Electrical system, Equipment. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
• 10233882Mar 15, 2023Transmission 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.
• 10232240Feb 28, 2023Transmission and drivetrain, Electrical system. This Service Information Bulletin provides an updated diagnostic flow along with an IMPORTANT caution to follow for certain CVT solenoid related DTCs as listed.
• 10232239Feb 28, 2023Equipment, Electrical system. This Service Information bulletin has been developed for use as a quick reference tool to aid in diagnosing operational concerns of the Gen 2 Telematics system’s remote access features.
• 10232237Feb 28, 2023Equipment, Electrical system. When attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully.
• 10232227Feb 20, 2023Electrical system, Equipment. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2022 model year Ascent vehicles.
• 10232225Feb 20, 2023Engine cooling, Electrical system. 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.
• 10232213Feb 3, 2023Equipment, Electrical system. Subaru Battery Drain Product Liability Litigation.
• 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.
• 10231303Jan 12, 2023Transmission 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.
• 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.
• 10231295Jan 9, 2023Transmission and drivetrain. CVT Assembly (WRK-21) Warranty Extension.
• 10231286Jan 5, 2023Electrical system. Subaru Battery Drain Product Liability Litigation.
• 10231280Jan 5, 2023Electrical system, Equipment. UPDATE Safety Recall: WRL-22 PTC Heater Ground Bolt (Owner notification)
• 10228791Dec 29, 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."
• 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, 2022Equipment, Electrical system. 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, 2022Electrical system, Equipment. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2022 model year Ascent vehicles. (WRL-22)
• 10226897Nov 29, 2022Electrical system. This bulletin announces a design change made to the power window main switches used in the models listed.
• 10226839Nov 18, 2022Electrical system, Equipment. In the interest of customer satisfaction, Subaru of America, Inc. is extending the New Car Basic Warranty coverage for the 12 Volt batteries used in the above listed models and model years beyond the original three (3) years or thirty six thousand miles (36,000), whichever comes first.
• 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, 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.
• 10226863Nov 17, 2022Equipment, Electrical system. 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).
• 10225753Oct 31, 2022Electrical system. Subaru Battery Drain Product Liability Litigation.
• 10225731Oct 31, 2022Engine cooling, Transmission 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.
• 10225772Oct 24, 2022Transmission and drivetrain. UPDATE: Subaru Safety & Emissions Recall: WRK-21 – CVT Chain Guide Breakage.
• 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).

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