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.

• 11037943Oct 5, 2026Other or unknown, Electrical system. This announcement provides information on a new software update for the Midtronics Dss and DCA machines.
• 11037946Sep 29, 2026Engine, Electrical system. This Bulletin provides a diagnostic procedure for customer concerns about hesitation, reduced acceleration, or lack of power when driving uphill or under heavy engine load.
• 11037945Sep 29, 2026Electrical system. This Bulletin provides a repair procedure for increased dark current and unintended battery discharge that occurs in a small number of unique cases.
• 11037942Sep 28, 2026Electrical system, Transmission and drivetrain. This announcement provides information on an enhancement of the TechShare CVT diagnostic assitance application.
• 11037940Sep 18, 2026Other or unknown. This bulletin provides paint code information for 2027 model year vehicles.
• 11037930Sep 15, 2026Other or unknown. This announcement provides an update to all 2027 model year Subaru warranty coverages for wear items and adjustments.
• 11037929Sep 14, 2026Other or unknown, Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin.
• 11037928Sep 14, 2026Electrical system, Other or unknown. In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the CP1 & Gen 3.1 Head Unit used in the listed models and model years to (8) eight years / 150,000 miles to cover certain qualifying repairs to the infotainment audio system. This is an revised version of the original bulletin.
• 11037927Sep 14, 2026Electrical system. This bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. This is an revised version of the original bulletin.
• 11037925Sep 4, 2026Electrical system, Other or unknown. This bulletin provides additional examples, diagnostics tips and installation tips as helpful aids to be used when working with sunroof seals and sunroof frame assemblies on Ascent models. This is an revised version of the original bulletin.
• 11037923Sep 4, 2026Other or unknown. This announcement provides an update to the WRH-26 certification label recall.
• 11036822Aug 31, 2026Body and structure. 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. This is an revised version of the original bulletin.
• 11036821Aug 31, 2026Electrical system, Engine. This bulletin announces the availability of new reprograming files for the Engine Control Module (ECM) developed to remedy the following DTCs: P0016, P0017, P0018, P0019, P0014, P0024, P0128, P2109. If any of the DTCs listed above are found to be stored in the ECM, follow the procedures outlined in the bulletin. This is an revised version of the original bulletin.
• 11036817Aug 25, 2026Other or unknown. Subaru of America, Inc. (Subaru) has initiated a non-compliance recall for certain 2026 model year Crosstrek Hybrid vehicles, 2025-2026 model year Forester & Forester Hybrid vehicles, and 2019- 2026 Ascent vehicles due to incorrect information listed on the certification label. This is an revised version of the original bulletin.
• 11036804Aug 21, 2026Transmission and drivetrain, Electrical system. This Announcement provides diagnostic assistance for CVT issues.
• 11036811Aug 20, 2026Engine. This service bulletin outlines the diagnostic and repair procedure for white smoke emitted from the exhaust after startup. This is an revised version of the original bulletin.
• 11036809Aug 20, 2026Transmission and drivetrain. This Service Information Bulletin announces the release of a new diagnostic assistance application for TR690 and TR580 CVT-equipped vehicles. This is an revised version of the original bulletin.
• 11036808Aug 20, 2026Transmission and drivetrain. This bulletin announces availability of new reprogramming files developed to address SYMPTOM 1: A jerk or judder sensation felt from the powertrain during braking with the air conditioning on. SYPMTOM 2: A shudder is felt from the powertrain along with a screeching type of sound. This is an revised version of the original bulletin.
• 11036807Aug 20, 2026Electrical system. This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw (dark/standby current) in vehicles experiencing battery drain when the ignition is off, leading to no-start conditions or frequent jump-starts.This is an revised version of the original bulletin.
• 11036806Aug 20, 2026Transmission 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. This is an revised version of the original bulletin.
• 11036796Aug 13, 2026Electrical system. This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. (This is an revised version of the original bulletin.)
• 11036794Aug 5, 2026Electrical system. Techtips newsletter locator index.
• 11036789Aug 1, 2026Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin
• 11035661Jul 28, 2026Other or unknown, Body and structure. WRH-26 Certification Label Non-Compliance Recall- Parts and SSLP Process Updates.
• 11035646Jul 24, 2026Other or unknown. This announcement provides WRH-26 recall information for owner contact and a vehicle disclosure form.
• 11035645Jul 24, 2026Other or unknown. This announcement provides WRH-26 recall information for customers.
• 11035644Jul 24, 2026Other or unknown. This announcement provides information on WRH-26 affected CPO and Used Vehicle Inventory.
• 11035642Jul 22, 2026Other or unknown. Subaru of America, Inc. (Subaru) has initiated a non-compliance recall for certain 2026 model yearCrosstrek Hybrid vehicles, 2025-2026 model year Forester & Forester Hybrid vehicles, and 2019- 2026 Ascent vehicles due to incorrect information listed on the certification label. (This is an revised version of the original bulletin.)
• 11035641Jul 21, 2026Other or unknown. This announcement provides an update for retailer inventory affected by the WRH-26 non-compliance recall.
• 11035640Jul 17, 2026Other or unknown. This announcement provides information on a temporary process for addressing affected SSLP vehicles under the WRH-26 recall.
• 11035639Jul 17, 2026Other or unknown. This announcement is to inform retailers of the non-compliance recall/stop sale parts update and repair procedure.
• 11034269Jun 30, 2026Engine. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers). (This is an revised version of the original bulletin.)
• 11034264Jun 26, 2026Fuel system, Engine. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers). (This is an revised version of the original bulletin.)
• 11034257Jun 23, 2026Engine. This bulletin outlines the diagnostic and repair procedure for white smoke emitted from the exhaust after startup.
• 11034249Jun 12, 2026Other or unknown. This announcement is requesting retailer staff to retain the EyeSight protective hood covers from Generation 4 EyeSight cameras.
• 11034271Jun 5, 2026Transmission and drivetrain. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed. (This is an revised version of the original bulletin.)
• 11034243Jun 3, 2026Engine. This bulletin announces the design change made to the exhaust manifold flange nut material that has been changed from stainless steel to medium carbon steel. This change also necessitates a revised tightening torque specification. (This is an revised version of the original bulletin.)
• 11033077May 28, 2026Transmission and drivetrain, Electrical system. This Bulletin announces a correction to the diagnostic procedures for certain CVT related DTCs, including P0730, P0746, P0747, P0841, P0846, P0867, P1867, P1894, and P2723.
• 11033069May 18, 2026Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11033065May 13, 2026Engine. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers).
• 11033061May 12, 2026Transmission and drivetrain, Electrical system. This bulletin announces a design change to the TR690 CVT control valve body which features an enhanced line pressure sensor O-ring, designed to prevent abnormal sensor readings caused by O-ring leakage.
• 11033056May 4, 2026Transmission and drivetrain. This announcement provides information on the remanufactured CVT transmission program.
• 11033051May 1, 2026Engine. This bulletin announces the diagnostic procedures to be used when DTCs B1571(REFERENCE CODE INCOMPATIBILITY IMMOBILIZER CM TO ECM) and B1572(IMM CIRCUIT EXCEPT ANTENNA CIRCUIT) are detected by Keyless Access with Push Button Start(KACM).
• 11032034Apr 30, 2026Other or unknown. This Service Information Bulletin was developed to provide interim guidance for vehicles exhibiting DTC B2A20.
• 11032039Apr 24, 2026Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11032035Apr 20, 2026Wheels, Steering. This Bulletin provides the diagnostic procedures to be followed when addressing customer concerns of steering wheel/vehicle body vibration when driving at highway speeds when tire/wheel balance is suspected.
• 11030560Mar 26, 2026Electrical system. This bulletin announces the new procedure and Warranty Fail Code for FirstTime air conditioning (A/C) performance concerns possibly resulting from an undetected A/C refrigerant leak.
• 11030557Mar 26, 2026Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11030573Mar 20, 2026Brakes. In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the front brake on 2019-24 model year Ascent models to 8 years (96 months) or 150,000 miles (whichever comes first) to address cases of front brake pulsation or squealing.
• 11030567Mar 16, 2026Electrical system. This bulletin contains information to help when attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully

← All problems reported for the 2021 Subaru Ascent