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.

• 10248193Dec 8, 2023Electrical 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.
• 10246138Nov 27, 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 cracking in the EPF.
• 10246109Nov 15, 2023Electrical system. This Service Information Bulletin announces the revised break-in procedure for the A/C compressor.
• 10246093Nov 9, 2023Electrical system, Latches, locks and linkages, Body and structure. This bulletin announces the initialization service procedures to be followed when diagnosing and/or repairing Power Rear Gate (PRG) systems.
• 10246084Nov 8, 2023Transmission and drivetrain, Electrical system. This bulletin announces the availability new service procedure developed for the diagnosis of the following DTCs detected by the Transmission Control Module (TCM):
• 10246083Nov 7, 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).
• 10244903Oct 26, 2023Other or unknown, Equipment, Electrical system. This 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.
• 10244909Oct 25, 2023Seats, Electrical system. This bulletin announces the availability of new seat ventilation blower units.
• 10244907Oct 12, 2023Equipment, Electrical system. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 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.
• 10244894Oct 6, 2023Electrical system. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands.
• 10244889Oct 2, 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
• 10243402Sep 28, 2023Engine cooling. This service bulletin provides a repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
• 10243392Sep 12, 2023Transmission and drivetrain, 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.
• 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.
• 10241841Aug 21, 2023Body and structure, Equipment. This bulletin announces the repair procedure for a rubbing-type sound that can be heard from the side of the console box when it comes in contact with a passenger’s knee or when the gear selector is moved.
• 10241813Aug 10, 2023Electrical system. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands.
• 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.
• 10240123Jul 31, 2023Equipment, Electrical system. This Service Information Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns.
• 10240114Jul 18, 2023Engine cooling, Electrical system. 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.
• 10240116Jul 11, 2023Electrical system, Transmission and drivetrain. This bulletin announces availability of reprogramming files to optimize the Transmission Control Module (TCM). The new files were designed to address cases of DTC P0711 (Transmission Fluid Temperature Sensor “A” Circuit Range/Performance) being detected by the TCM during low ambient temperatures (32° F(0° C)).
• 10240108Jul 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.
• 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.
• 10238443Jun 6, 2023Electrical 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.
• 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.
• 10237282May 24, 2023Equipment, Electrical system. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands.
• 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.
• 10237278May 16, 2023Transmission and drivetrain. This bulletin announces availability of reprogramming files to optimize the Transmission Control Module (TCM).
• 10237276May 15, 2023Equipment, Electrical system. Map Data Update Procedure for Harman Gen 3.1 Navigation Equipped Head Units (H/U).
• 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, 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.
• 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, 2023Electrical system, Transmission and drivetrain, Equipment. 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, 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.
• 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.
• 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.
• 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.

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