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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

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
07-178-21R2024-10-02. Service bulletin. ELECTRICAL SYSTEM. This Service Information bulletin is being released as guidance for proper testing and charging of vehicle batteries.
15-320-242024-10-02. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure.
SubaruNet Announcement2024-10-02. Other. ELECTRICAL SYSTEM. The CP1.5 RCs OTA is available for all mid and high grade CP1.5 head units.
09-115-24R2024-10-02. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This bulletin announces the availability of new oxygen sensors developed to address Diagnostic Trouble Codes (DTCs) detected by the Engine Control Module.
15-320-242024-09-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure for 2025MY vehicles.
01-168-09R2024-09-04. Service bulletin. ELECTRICAL SYSTEM; ENGINE. The purpose of this bulletin is to provide replacement key and immobilizer information along with an overview of the Subaru Lock Information web-site.
15-308-23R2024-09-04. Service bulletin. ELECTRICAL SYSTEM. This Service Information Bulletin announces important diagnostic information to utilize when the Data Communication Module (DCM) is being tested as a dark current/standby current source.
15-251-19R2024-09-04. Service bulletin. ELECTRICAL SYSTEM. This Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
15-256-19R2024-09-04. Service bulletin. 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.
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.
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.
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.
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.
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.
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.
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. "

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