2021 Subaru Legacy Technical Service Bulletins

460 technical service bulletins (TSBs) are on record for the 2021 Subaru Legacy. 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.

• 10244908Oct 12, 2023Electrical system, Equipment. This Service Information Bulletin is to inform you of the diagnosis procedure of the CP1/ CP1.5 Infotainment System when DTC B2256 is detected.
• 10244906Oct 9, 2023Engine cooling, Equipment. This Service Information Bulletin announces diagnostic service procedures to be followed when DTC P0420 (Catalyst System Efficiency Below Threshold Bank 1) is detected by the Engine Control Module (ECM). If DTC P0420 is found to be stored in the ECM, follow the diagnostic procedures outlined below.
• 10244895Oct 6, 2023Electrical system. This bulletin announces a new Genuine Subaru Replacement battery for use in applications where the current SOA821B700 battery is specified.
• 10243402Sep 28, 2023Engine cooling. This service bulletin provides a repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10243401Sep 28, 2023Seats, Electrical system. This bulletin announces a design change made to the outer hinge cover on the driver’s 10-way adjustable power seats.
• 10243393Sep 12, 2023Body and structure. This Service Information Bulletin announces the repair procedure developed to address rattle-type sounds heard from the left and/or right B-Pillar area.
• 10243391Sep 12, 2023Transmission and drivetrain, Engine cooling, Equipment. 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.
• 10243372Sep 11, 2023Forward collision avoidance, Electrical system, Equipment. This Bulletin announces additional information regarding error codes 1403- 1407 encountered when attempting an adjustment/calibration of the EyeSight® system after body repair procedures have been performed.
• 10241846Aug 31, 2023Engine cooling, Electrical system, Equipment. This Service Information 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.
• 10241843Aug 24, 2023Engine cooling. This bulletin announces design changes made to the Exhaust Pipe Front (EPF) to address concerns of rattle-type or fluttering sounds coming from the undercarriage during acceleration caused by crackingin the EPF.
• 10241830Aug 15, 2023Seats. "This bulletin announces a design change made to the outer hinge cover on the driver’s 10-way adjustable power seats."
• 10241818Aug 10, 2023Electrical system, Equipment. This bulletin announces a new Genuine Subaru Replacement battery for use in applications where the current SOA821B700 battery is specified.
• 10241801Aug 1, 2023Equipment, Electrical system, Latches, locks and linkages. The purpose of this bulletin is to provide replacement key and immobilizer information along with an overview of the Subaru Lock Information web-site.
• 10240115Jul 18, 2023Electrical system, Engine cooling. This bulletin announces diagnostic procedures and availability of new Engine Control Module (ECM) reprogramming files to address DTC P2404 (Evap System Leak Detection Pump Sense Circuit Range/Performance) detection.
• 10240113Jul 13, 2023Equipment, Electrical system. This Bulletin provides reference tables and photos to use for determining the infotainment head unit supplier and generation.
• 10240110Jul 11, 2023Equipment. This bulletin announces the recommended cleaning procedures to followed when encountering vehicles with long time exposure to pollen on painted surfaces on vehicles imported from Japan. This bulletin does not apply to SIA built vehicles.
• 10240109Jul 11, 2023Equipment, Engine cooling. This bulletin announces design changes made to the Exhaust Pipe Front (EPF) to address concerns of rattle-type or fluttering sounds coming from the undercarriage during acceleration caused by cracking in the EPF.
• 10238472Jun 30, 2023Equipment, Electrical system. This Service Information Bulletin outlines a new required procedure to follow when performing immobilizer-related repairs.
• 10238470Jun 29, 2023Equipment, Electrical system. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
• 10238469Jun 29, 2023Engine cooling. This Service Information Bulletin announces the proper diagnostic procedures regarding oil leakage from the oil level switch area.
• 10238456Jun 28, 2023Transmission and drivetrain, Electrical system. 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.
• 10238440Jun 13, 2023Transmission and drivetrain, Engine cooling. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10238438Jun 5, 2023Equipment, Other or unknown, Engine cooling, Electrical system. This Service Information Bulletin provides the diagnostic procedure for the STARLINK® Remote Engine Start (RES). All Gen2 and Gen3 Telematics Equipped Models.
• 10237291May 22, 2023Suspension. This bulletin provides a procedure to address customer concerns of surface rust accumulating in the top center retaining nut area of the front strut mounts.
• 10237284May 16, 2023Equipment, Electrical system. This bulletin announces a new Genuine Subaru Replacement battery for use in applications where the current SOA821B700 battery is specified.
• 10237281May 16, 2023Engine cooling, Equipment. This bulletin announces availability of a new thermo control valve assembly.
• 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, 2023Equipment, Electrical system, Engine cooling. 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.
• 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.
• 10235307Apr 25, 2023Engine cooling. This Service Information Bulletin announces a design change made to the Positive Crankcase Ventilation (PCV) hose assembly.
• 10235291Apr 17, 2023Equipment, Latches, locks and linkages. This Bulletin announces additional cautions being added to the Owner’s Manual and Service Manual regarding the operation of door locks.
• 10235285Apr 5, 2023Electrical system, Equipment. 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.
• 10233907Mar 23, 2023Equipment, Electrical system. This Bulletin provides reference tables and photos to use for determining the infotainment head unit supplier and generation.
• 10233917Mar 15, 2023Equipment, Electrical system. This Service Information Bulletin addresses isolated customer concerns regarding the pictured CP1 BASE Model Center Information Display (CID) LOWER 7-inch display screen flashing, not responding to touch inputs and / or shutting off intermittently.
• 10233899Mar 15, 2023Electrical system, Equipment. USB Map Data Update Procedure for Denso Gen 4 Navigation Equipped System.
• 10233892Mar 15, 2023Equipment, Electrical system. This bulletin provides instruction for use of a new reprogramming procedure to optimize the Denso Gen 4 Audio and Navigation system utilized in the models listed.
• 10233886Mar 15, 2023Equipment, Electrical system. 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.
• 10233880Mar 13, 2023Electrical system, Equipment. The following information announces reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4 Denso CP1 Audio and Navigation head units utilized in the models listed.
• 10233874Mar 10, 2023Electrical system, Equipment. In the interest of customer satisfaction, Subaru of America, Inc. (Subaru) is initiating a Service Program for certain 2020-2021 model year Legacy and Outback vehicles to update the Cockpit Control Module (CCM) software to the latest version.
• 10233867Mar 6, 2023Electrical system. This bulletin announces a new Genuine Subaru Replacement battery for use in applications where the current SOA821B700 battery is specified.
• 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, 2023Electrical system, Equipment. When attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully.
• 10232236Feb 28, 2023Engine cooling, Electrical system. This Service Information Bulletin provides insight in response to both customer and retailer feedback resulting from the use of OBD-II port connected devices.
• 10232235Feb 28, 2023Engine cooling, Electrical system. This bulletin announces the availability of new reprograming files for the Engine Control Module (ECM) developed to remedy DTCs.
• 10232220Feb 13, 2023Equipment, Electrical system. The following information announces reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4 Denso CP1 Audio and Navigation head units utilized in the models listed.
• 10231312Jan 24, 2023Electrical system, Engine cooling, Equipment. Engine Surging/Jolting During Accelerator Release.
• 10231296Jan 24, 2023Electrical system. This bulletin announces a new Genuine Subaru Replacement battery for use in applications where the current SOA821B700 battery is specified.
• 10231306Jan 17, 2023Electrical system, Engine cooling. This bulletin announces availability of reprogramming files developed for the Engine Control Module (ECM) to optimize the fuel injection system’s fuel spray pattern and engine block heater detection.
• 10231304Jan 12, 2023Equipment, Electrical system. The following information announces reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4 Denso CP1 Audio and Navigation head units utilized in the models listed.

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