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Service bulletins for the 2021 Subaru Forester

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

371 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
Subarunet Announcement2024-08-05. Other. ELECTRICAL SYSTEM. This announcement provides information for retailers to install the latest infotainment system software for Denso CP 1.5.
15-308-23R2024-08-05. Service bulletin. ELECTRICAL 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.
Subarunet Announcement2024-08-05. Other. AIR BAGS; ELECTRICAL SYSTEM. This announcement provides information on Takata Recall Escalated Towing Program.
Thermo Control Valve Vide2024-08-05. Other. ENGINE. This thermo control valve video contains information on the replacement of thermo control valve.
15-236-18R2024-08-05. Service bulletin. ELECTRICAL 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.
13-107-242024-08-05. Service bulletin. UNKNOWN OR OTHER. This Bulletin provides SOA paint codes to help eliminate possible confusion for 2025 MY vehicles.
01-167-08R2024-08-05. Service bulletin. UNKNOWN OR OTHER. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
09-125-242024-08-05. Service bulletin. ELECTRICAL 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.
05-91-242024-08-05. Service bulletin. SUSPENSION. This Bulletin provides guidance for diagnosing a leaking front or rear suspension strut.
SubaruNet Announcement2024-07-01. Other. ELECTRICAL 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.
06-90-242024-07-01. Service bulletin. SERVICE BRAKES. 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.
07-221-23R2024-07-01. Service bulletin. ELECTRICAL SYSTEM. This bulletin announces the repair procedures when corrosion is encountered within the instrument panel wiring harness and the rear wiring harness connectors.
07-218-23R2024-07-01. Service bulletin. ELECTRICAL SYSTEM; ENGINE. 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.
15-319-242024-06-04. Service bulletin. ELECTRICAL 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.
09-115-242024-06-04. Service bulletin. ELECTRICAL 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).
09-122-242024-06-04. Service bulletin. ELECTRICAL SYSTEM; FUEL/PROPULSION SYSTEM; ENGINE. 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.
03-91-23R2024-05-02. Service bulletin. EQUIPMENT; POWER TRAIN. 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.
09-119-242024-05-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. 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.
09-80-21R2024-05-02. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. 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.
07-218-23R2024-04-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. To satisfy current supply demands, a new Subaru alternative replacement battery is now available.
15-256-19R2024-04-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. 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.
15-236-18R2024-04-03. Service bulletin. EQUIPMENT; 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.
15-257-19R2024-04-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. "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. "
15-242-19R2024-04-03. Service bulletin. EQUIPMENT. 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.
15-219-18R2024-04-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin addresses an error code 202 and or 204 when attempting to complete the STARLINK telematics subsription process.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.