2021 Subaru Forester Technical Service Bulletins

371 technical service bulletins (TSBs) are on record for the 2021 Subaru Forester. 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.

• 11005615Jul 18, 2024Electrical system. This announcement provides information for retailers to install the latest infotainment system software for Denso CP 1.5.
• 11005614Jul 17, 2024Electrical system. This bulletin announces important diagnostic information to utilize when testing the Data Communication Module (DCM) as a dark current/standby current source. All models equipped with Telematics except Solterra.
• 11005609Jul 15, 2024Electrical system, Air bags. This announcement provides information on Takata Recall Escalated Towing Program.
• 11005608Jul 11, 2024Engine. This thermo control valve video contains information on the replacement of thermo control valve.
• 11005605Jul 9, 2024Electrical system. This bulletin 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.
• 11005599Jul 9, 2024Other or unknown. This Bulletin provides SOA paint codes to help eliminate possible confusion for 2025 MY vehicles.
• 11005595Jul 8, 2024Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11005594Jul 8, 2024Electrical system, Engine. This bulletin announces the availability of new reprogramming files for the Engine Control Module (ECM), to address concerns of the starter motor not operating.
• 11005593Jul 8, 2024Suspension. This Bulletin provides guidance for diagnosing a leaking front or rear suspension strut.
• 11002730Jun 28, 2024Electrical system. This information announces reprograming file availability for Gen 4.5 Denso CP1.5 Audio and Navigation systems. Inprovement for CarPlay concerns with hands-free calls when the receiving party is not able to hear the caller.
• 11002725Jun 25, 2024Brakes. This bulletin provides diagnosis and procedure information to be applied when diagnosing potential fluid leaks on front and rear brake calipers. This information has been developed to reduce unnecessary brake caliper replacement.
• 11002723Jun 24, 2024Electrical system. This bulletin announces the repair procedures when corrosion is encountered within the instrument panel wiring harness and the rear wiring harness connectors.
• 11002715Jun 4, 2024Engine, Electrical system. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands. The alternative replacement battery has a higher capacity and is slightly larger in size.
• 11000830May 14, 2024Electrical system, Engine. This bulletin announces the diagnostic procedures to be followed when encountering cases of the Remote Engine Start (RES) system being the only non-functioning feature with telematics.
• 11000828May 14, 2024Electrical system, Engine. This bulletin announces the availability of new oxygen sensors developed to address the following Diagnostic Trouble Codes (DTCs); P0137 (O2 Sensor Circuit Low Voltage Bank 1 Sensor 2, P0138 (O2 Sensor Circuit High Voltage Bank 1 Sensor 2) P0140 (O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2), and P0141 (O2 Sensor Heater Circuit Bank 1 Sensor 2).
• 11000820May 14, 2024Electrical system, Engine, Fuel system. This bulletin the 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.
• 10253993Apr 23, 2024Equipment, Transmission and drivetrain. This bulletin announces the design change made to the front drive axle shaft assemblies to address cases of a clicking/cracking-type sound heard when driving with the steering wheel in the fully locked (left or right) position.
• 10253930Apr 4, 2024Equipment, Engine cooling, Electrical system. This bulletin announces the extended warranty coverage for the Thermo Control valve (TCV) used the the models listed. The coverage will be extended to (15) fifteen years / 150,000 miles.
• 10253903Apr 1, 2024Engine cooling, Equipment. This bulletin announces availability of a new thermo control valve assembly. The new valve contains an enhanced stainless steel internal shaft for optimized durability along with advanced water proofing for the sensor portion.
• 10252545Mar 28, 2024Electrical system, Equipment. To satisfy current supply demands, a new Subaru alternative replacement battery is now available.
• 10252542Mar 27, 2024Equipment, 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.
• 10252541Mar 26, 2024Equipment, Electrical system. This bulletin addresses the 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.
• 10252531Mar 19, 2024Electrical system, Equipment. "This Bulletin provides insight in response to both customer and retailer feedback resulting from the use of OBD-II port connected devices. These devices are often employed by insurance companies to monitor driver activity for premium calculations, and can cause DTC B2A15, a red telematics MIL to illuminate, or recurring STARLINK notification to retailers and emails to customers. "
• 10252492Mar 19, 2024Equipment. 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.
• 10252491Mar 19, 2024Equipment, Electrical system. This bulletin addresses an error code 202 and or 204 when attempting to complete the STARLINK telematics subsription process.
• 10252454Mar 5, 2024Electrical system, Equipment. This bulletin provides the diagnostic procedure for Harman Infotainment Systems when DTC B2255 is detected. This update should prevent unnecessary replacement of the head unit or USB cable.
• 10251098Feb 6, 2024Engine cooling, Electrical system, Equipment. This bulletin addresses limited cases of engine speed drop when the engine is restarted with the auto start/stop function. Updated software available for the Transmission Control Module (TCM), will optimize the engine cranking speed monitoring program of the TCM.
• 10251094Feb 5, 2024Electrical system, Engine cooling. This bulletin addresses rare cases of engine surg or jolting when the operator releases the accelerator from half-throttle.
• 10249614Jan 22, 2024Fuel system. This bulletin announces design changes made to the fuel injector assembly in response to the DTCs listed.
• 10249609Jan 11, 2024Engine cooling, Electrical system, Equipment. 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.
• 10249606Jan 11, 2024Equipment, Electrical system. This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
• 10249605Jan 9, 2024Equipment, 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.
• 10249602Jan 8, 2024Transmission and drivetrain. This bulletin announces the design change made to the front drive axle shaft assemblies to address cases of a clicking/cracking-type sound heard when driving with the steering wheel in the fully locked (left or right) position.
• 10249595Jan 4, 2024Engine cooling, Equipment. "This bulletin announces availability of new reprograming files for the Engine Control Module (ECM) developed to remedy engine DTCs."
• 10248205Dec 21, 2023Electrical system, Equipment. This bulletin announces availability of a new Genuine Subaru Alternative Replacement Battery introduced to satisfy current supply demands.
• 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.
• 10246093Nov 9, 2023Body and structure, Electrical system, Latches, locks and linkages. This bulletin announces the initialization service procedures to be followed when diagnosing and/or repairing Power Rear Gate (PRG) systems.
• 10246088Nov 8, 2023Steering, Equipment. This bulletin announces the design change made to the leather wrapped steering wheels.
• 10246083Nov 7, 2023Equipment, Engine cooling. 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, 2023Equipment, Electrical system, Other or unknown. 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.
• 10244910Oct 25, 2023Body and structure. This Bulletin announces the repair procedure developed to address rattle-type sounds heard from the left and/or right B-Pillar area.
• 10244907Oct 12, 2023Electrical system, Equipment. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected.
• 10244906Oct 9, 2023Equipment, Engine cooling. 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.
• 10244891Oct 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
• 10243401Sep 28, 2023Electrical system, Seats. This bulletin announces a design change made to the outer hinge cover on the driver’s 10-way adjustable power seats.
• 10243393Sep 12, 2023Body and structure. This Service Information Bulletin announces the repair procedure developed to address rattle-type sounds heard from the left and/or right B-Pillar area.
• 10243390Sep 11, 2023Body and structure, Equipment. This bulletin announced a design change made to the power rear gate drive unit assemblies.
• 10243372Sep 11, 2023Forward collision avoidance, Equipment, Electrical system. 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, 2023Electrical system, Equipment, Engine cooling. 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.

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