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.

• 11019934Jun 10, 2025Electrical 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
• 11018914May 29, 2025Fuel 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).
• 11018912May 29, 2025Electrical system. 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.
• 11018909May 19, 2025Other or unknown. The purpose of this bulletin is to provide replacement key and immobilizer information along with an overview of the Subaru Lock Information web-site.
• 11018908May 19, 2025Brakes. 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.
• 11018904May 13, 2025Other or unknown. This bulletin announces a design change to the knob of the center air vent grilles.
• 11018899May 13, 2025Electrical 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.
• 11018901May 5, 2025Electrical system, Air bags. This bulletin announces the repair procedures for the left and right-side horns to address DTC B1610 (Front Sub Sensor RH Failure) detected when the horns are operated shortly after engine start up.
• 11017466Apr 30, 2025Electrical system. This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 11017461Apr 29, 2025Body and structure, Electrical system. This bulletin announces availability of new door window regulator assemblies and door glass run channel seals in response to limited concerns of erratic operation of the anti-entrapment feature and / or the door glass either not closing or closing very slowly.
• 11017459Apr 28, 2025Body and structure. This bulletin announces a design change to the hood lock switch portion of the hood lock assembly.
• 11017452Apr 22, 2025Engine. This Bulletin announces the diagnostic procedures to be followed when diagnosing engine oil leakage on FA and FB type engines.
• 11017444Apr 22, 2025Transmission and drivetrain, Suspension. This bulletin announces design changes made to the rear axle hubs. These changes have been implemented to reduce cases water intrusion further leading to harmonic, humming, and grinding type sounds heard from the axle hub while driving.
• 11017438Apr 14, 2025Fuel 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).
• 11016234Mar 31, 2025Other or unknown. This Bulletin announces availability of a User Guide and an informative video to supplement the recent releases to retailers of the SOA321152 and SOA321153 Terminal Test Kits.
• 11016230Mar 27, 2025Electrical system, Body and structure. This bulletin announces design changes made to the Power Rear Gate Drive (PRG) Unit to address concerns of the power rear gate being inoperative.
• 11016229Mar 27, 2025Visibility (wipers, defrost, mirrors). This announcement is in regard to the warranty extension initiated for windshields for the models listed.
• 11016233Mar 24, 2025Electrical system. 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 above listed models and model years to (8) eight years / 150,000 miles to cover certain qualifying repairs to the infotainment audio system.
• 11016224Mar 24, 2025Engine. The purpose of this bulletin is to advise of SOA’s revised Catalytic Converter Recycling Program shipping procedure.
• 11016218Mar 24, 2025Visibility (wipers, defrost, mirrors). In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the Front Windshield used in the above listed models and model years from three (3) years / 36,000 miles to eight (8) years / 100,000 miles (whichever comes first). If a customer experiences windshield damage, inspect the damage as per the guidelines supplied in this bulletin to confirm if…
• 11016208Mar 18, 2025Body and structure, Visibility (wipers, defrost, mirrors). 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.
• 11016206Mar 18, 2025Electrical system. This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns.
• 11016205Mar 17, 2025Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11016204Mar 17, 2025Brakes. 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.
• 11016175Mar 13, 2025Visibility (wipers, defrost, mirrors). This bulletin announces availability of new door window regulator assemblies and door glass run channel seals in response to limited concerns of erratic operation of the anti-entrapment feature and / or the door glass either not closing or closing very slowly.
• 11016174Mar 6, 2025Body and structure. This Bulletin announces diagnostic procedures to be followed when working with a Power Rear Gate (PRG).
• 11016172Mar 6, 2025Electrical system. When attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully.
• 11016171Mar 6, 2025Other or unknown. This bulletin announces the design change made to the left and right A-Pillar trim panels which will address cases of loose fitment.
• 11014870Feb 18, 2025Electrical system. 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.
• 11014859Feb 18, 2025Engine. This bulletin announces the design change made to the exhaust manifold flange nuts. The material has been changed from a medium carbon steel to stainless steel.
• 11014858Feb 18, 2025Engine. This bulletin announces the design change made to the exhaust manifold flange nuts. The material has been changed from a medium carbon steel to stainless steel.
• 11014867Feb 17, 2025Visibility (wipers, defrost, mirrors), Electrical system. This bulletin announces availability of new door window regulator assemblies and door glass run channel seals in response to limited concerns of erratic operation of the anti-entrapment feature and/or the door glass either not closing or closing very slowly.
• 11014865Feb 17, 2025Engine. 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).
• 11014848Feb 13, 2025Visibility (wipers, defrost, mirrors). In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the Front Windshield used in the above listed models and model years from three (3) years / 36,000 miles to eight (8) years / 100,000 miles (whichever comes first).
• 11014852Feb 10, 2025Electrical system. "This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16."
• 11013551Jan 31, 2025Transmission 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.
• 11013530Jan 31, 2025Other or unknown. This announcement is in regard to special service tool shipment will be shipped directly to the Subar retailers during February.
• 11013515Jan 31, 2025Visibility (wipers, defrost, mirrors). This bulletin announces availability of new door window regulator assemblies and door glass run channel seals in response to limited concerns of erratic operation of the anti-entrapment feature and / or the door glass either not closing or closing very slowly.
• 11013547Jan 29, 2025Electrical system. As part of Subaru's dedication to customer satisfaction, Subaru of America, Inc. (SOA) is announcing a Warranty Extension of the New Vehicle Limited Warranty coverage for the CP1 & Gen 3.1 Infotainment head units for the models listed.
• 11013535Jan 29, 2025Electrical system. This bulletin gives information on extended New Car Limited Warranty for CP1 and Gen 3.1 Head Units.
• 11013525Jan 28, 2025Electrical system. A head unit OTA will be available via cellular network for Mid and High Grade CP1.5 head units.
• 11013512Jan 17, 2025Electrical system, Fuel system. This bulletin announces the repair procedures to be followed when DTC P1449 (EVAP System Clog Detected) is detected by the Engine Control Module (ECM).
• 11012265Dec 19, 2024Fuel 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).
• 11012261Dec 17, 2024Visibility (wipers, defrost, mirrors). This announcement is in regard to settlement in a class action lawsuit for vehicles that will receive a limited warranty extension for original equipment Subaru windshields experiencing a qualifying crack.
• 11012260Dec 13, 2024Exterior lighting, Electrical system. This bulletin is for information purposes only.The bulletin adresses design changes of the headlamps and rear combination lamps, where moisture and or condensation may develop on the inside of the lamp lenses.
• 11012257Dec 4, 2024Transmission 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.
• 11012253Dec 3, 2024Engine, Electrical system. "This bulletin announces availability of new reprogramming files developed to address the two symptoms described below: 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. NOTE: Both of these symptoms are not related with a fault code.
• 11010932Nov 22, 2024Transmission and drivetrain, Electrical system. "This bulletin announces availability of new reprogramming files developed to address the two symptoms described below: 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. NOTE: Both of these symptoms are not related with a fault code."
• 11010931Nov 22, 2024Brakes. 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.
• 11010928Nov 22, 2024Seat belts, Electrical system. This bulletin announces a design change made to the second row inner seat belt buckle assembly to address cases of the seat belt indicator warnings not turning off after the buckle is fully latched.

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