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.

• 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
• 10189236Feb 18, 2021Equipment. +H31&I31
• 10188185Feb 17, 2021Electrical system, Equipment. 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, 2021Electrical system, Equipment, Visibility (wipers, defrost, mirrors). 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.
• 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.
• 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.
• 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.
• 10186389Jan 14, 2021Equipment, Electrical system. This bulletin provides important information regarding diagnosis and replacement of the STARLINK Telematics Data Communication Module (DCM). This update is applicable to all models equipped with a STARLINK 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.
• 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, 2020Electrical 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.
• 10185076Dec 14, 2020Electrical system, Equipment. This bulletin provides information related to error code(s) 202 and/or 204 generated during the Gen 2 telematics subscription process.
• 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.
• 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.
• 10182215Oct 13, 2020Equipment, Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure.
• 10182214Oct 13, 2020Tires, Electrical system. This Service Information Bulletin announces additional diagnostic procedures for TPMS related DTC C2921 on the applicable models listed.
• 10232535Jul 17, 2014Electrical system. Replacement Key and Immobilizer Info
• 10232894Mar 7, 2014Engine cooling. Effective with all 2015 model year cars and forward, the oil change interval is changing to 6,000 miles or 6 months, whichever comes first.
• 10233119Apr 25, 2013Engine cooling. Oil Filler Cap Gasket Coming Unseated
• 10232869Feb 19, 2013Equipment, Other or unknown. Puddle Light Recall

← All problems reported for the 2021 Subaru Ascent