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.

• 10194830May 21, 2021Engine 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.
• 10194847May 18, 2021Engine cooling. This bulletin outlines changes in the service procedure for scavenge pump assembly installation.
• 10194827May 5, 2021Equipment. Description of current changes to Service Manuals available via the Subaru Technical Information System (STIS) web site.
• 10191666Apr 30, 2021Body and structure. This bulletin announces design changes made to the front and rear door glass run channels.
• 10191664Apr 27, 2021Electrical system, Wheels. This bulletin announces a design change made to the TPMS valve assemblies.
• 10191591Apr 21, 2021Electrical system. This bulletin provides additional procedures and a detailed flow chart to use when diagnosing customer concerns regarding operation of the STARLINK RES feature.
• 10191586Apr 9, 2021Equipment. This bulletin announces availability of new audio unit amplifier units with revised internal logic designed to optimize efficiency.
• 10191582Apr 7, 2021Body and structure. This bulletin announces design changes made to the trim cover for the PRG control switches located on the bottom of the rear gate inner trim panel.
• 10191581Apr 5, 2021Body and structure. This bulletin announces changes made to the rear door weatherstrip to optimize sealing performance.
• 10189674Mar 26, 2021Electrical system. In January 2021, the replacement battery application for all Ascent and 2017- 2021 Impreza models were changed from part number SOA821B200 to part number SOA821B600.
• 10188201Feb 26, 2021Equipment. This bulletin announces availability of new front wheel hub assemblies incorporating bearing surfaces having increased resistance to imperfections resulting from shock loads.
• 10188160Feb 23, 2021Equipment, Transmission 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.
• 10188191Feb 22, 2021Electrical system. SOA821B600 Battery Supersession
• 10188185Feb 17, 2021Equipment, Electrical system. This bulletin announces a change made to the MFD software to keep the affected units listed below compliant with Apple® CarPlay® certification.
• 10188183Feb 17, 2021Engine, Equipment. This bulletin announces the upcoming issuance to all retailers of an essential tool update kit for the Engine Support Assembly Kit #J-50135-A.
• 10188179Feb 15, 2021Equipment, Visibility (wipers, defrost, mirrors), Electrical system. This bulletin announces a design change made to the power window main switches.
• 10188173Feb 12, 2021Equipment, Electrical system. This bulletin provides helpful information about operating conditions observed in the field for Technicians to use when diagnosing customer concerns which may arise while operating Harman Gen 3 Navigation and Display Audio systems.
• 10188170Feb 10, 2021Equipment, 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.
• 10188168Feb 5, 2021Electrical system, Equipment. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.
• 10188167Feb 5, 2021Engine cooling, Electrical system. This bulletin announces availability of reprogramming files for the Engine Control Module (ECM).
• 10188162Feb 4, 2021Engine cooling, Electrical system. This bulletin announces availability of reprogramming files for the ECM. These new files will address DTC P1160 and customer concerns of extended cranking in cold temperatures.
• 10188158Feb 3, 2021Latches, locks and linkages, Electrical system, Body and structure. This bulletin replaces TSB 07-143-18R and announces additional changes made to the PRG control module. These changes are in response to a limited number of customer concerns regarding the rear gate not opening when operating the gate mounted switch, dashboard switch or the rear gate button on the key fob.
• 10187315Feb 1, 2021Equipment. To help reduce confusion and increase technician efficiency, Subaru of America, Inc. (SOA) has developed the following cross reference list to help locate the appropriate Special Service Tool.
• 10186436Jan 28, 2021Electrical system. This bulletin announces a design change made to the power window main switches.
• 10186418Jan 26, 2021Electrical system, Transmission and drivetrain. 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.
• 10186416Jan 18, 2021Transmission 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.
• 10186381Jan 15, 2021Body and structure, Equipment. This bulletin announces design changes made to the trim cover for the rear gate PRG control switches located on the bottom of the rear gate inner trim panel.
• 10186391Jan 14, 2021Electrical system. This bulletin provides information related to error code 202 and/or 204 generated during the Gen 2 Telematics subscription process. This bulletin is applicable to all 2019-2021MY vehicles equipped with a Gen. 2 Telematics System.
• 10186380Jan 14, 2021Electrical system, Equipment. This bulletin provides an overview and basic instructions for use of the “Destination to Vehicle” feature of the Gen 2 Telematics system.
• 10186379Jan 14, 2021Electrical system. This bulletin provides helpful procedures and best practices to utilize when customers present with concerns relating to the operation of their Gen 2 Telematics system equipped Subaru.
• 10186378Jan 14, 2021Electrical system, Equipment. This bulletin provides information related to the telematics system's Automatic Collision Notification (ACN) and Advanced Automatic Collision Notification (AACN) feature operation, diagnostic tips, and best practices.
• 10186377Jan 14, 2021Electrical system. This 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.
• 10186363Jan 12, 2021Seat belts, Seats. 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.
• 10186355Jan 7, 2021Electrical system, Equipment. Reprogramming File Availability for Optimization of Harman Gen 3.1 and Gen 3.1α Audio and Navigation Head Units.
• 10186348Jan 4, 2021Equipment, Electrical system. The purpose of this bulletin is to provide replacement key and immobilizer information.
• 10185089Dec 29, 2020Equipment, Transmission and drivetrain. This Service Information Bulletin provides updated diagnostic procedures to follow when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions.
• 10185088Dec 21, 2020Equipment, 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.
• 10185083Dec 15, 2020Seat belts, Equipment. 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.
• 10185082Dec 15, 2020Equipment, Seats, Seat 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.
• 10185076Dec 14, 2020Equipment, Electrical system. This bulletin provides information related to error code(s) 202 and/or 204 generated during the Gen 2 telematics subscription process.
• 10185066Dec 7, 2020Equipment, Seats. This bulletin provides a repair procedure to address a squeaking sound coming from the backrest hinge area of the front seats. The procedure applies to both manually and power operated seat assemblies.
• 10185062Dec 1, 2020Transmission and drivetrain. This bulletin has been developed in response to a small number of customer concerns regarding fluid seepage found coming from the CVT assembly.
• 10183708Nov 23, 2020Equipment. Map update for Harman Gen 3.1 Navigation Equipped Head Units.
• 10183714Nov 9, 2020Transmission and drivetrain. This Service Information Bulletin provides corrected diagnostics containing a revised flow for certain CVT solenoid related DTCs.
• 10183695Nov 9, 2020Equipment, Engine cooling, Electrical system. Subaru Service and Technical Support Line Newsletter. (QMR of the Month)
• 10183694Nov 9, 2020Latches, locks and linkages, Equipment, Body and structure. This bulletin announces design changes made to the trim cover for the rear gate PRG control switches located on the bottom of the rear gate inner trim panel.
• 10182249Oct 30, 2020Equipment, Electrical system. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.
• 10182247Oct 29, 2020Equipment. 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.
• 10182242Oct 26, 2020Electrical system, Equipment. This Service Information Bulletin provides corrected and updated procedures to follow when replacing the combination meter assembly.
• 10182222Oct 14, 2020Equipment, Seats. This bulletin announces a design change made to the front seat backrest frame assemblies in response to a limited number of customer reports of a squeaking sound heard when leaning back in the front seats.

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