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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: Transmission and driveline are shown. Show all

Bulletins, newest first
SubaruNet Announcement (T2026-10-05. Other. POWER TRAIN; ELECTRICAL SYSTEM. This announcement provides information on an enhancement of the TechShare CVT diagnostic assitance application.
16-158-262026-09-03. Service bulletin. POWER TRAIN. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR580 model CVT transmissions used in the models listed.
16-156-25R2026-09-03. Service bulletin. POWER TRAIN. This bulletin announces a design change made to the CVT Control Valve Body. The updated valve body incorporates an enhanced valve sleeve to improve durability. This is an revised version of the original bulletin.
16-154-25R2026-09-03. Service bulletin. POWER TRAIN. 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.
16-132-20R2026-09-03. Service bulletin. POWER TRAIN. 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.
SubaruNet Announcement (C2026-09-03. Other. ELECTRICAL SYSTEM; POWER TRAIN. This Announcement provides diagnostic assistance for CVT issues.
16-156-25R2026-07-01. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability. (This is an revised version of the orignal bulletin.)
16-156-25R2026-06-01. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability.
SubaruNet Announcement (R2026-06-01. Other. POWER TRAIN. This announcement provides information on the remanufactured CVT transmission program.
03-97-262026-05-04. Service bulletin. POWER TRAIN. This bulletin announces the service manual correction regarding clutch master cylinder reservoir service procedures.
16-156-25R2025-11-04. Service bulletin. POWER TRAIN. This bulletin announces a design change made to the CVT Control Valve Body which enhancement was implemented to prevent abnormal operations. The updated valve body incorporates an enhanced valve sleeve to improve durability.
16-156-252025-10-02. Service bulletin. POWER TRAIN. This bulletin announces a design change made to the CVT Control Valve Body. The updated valve body incorporates an enhanced valve sleeve to improve durability.
05-94-252025-10-02. Service bulletin. WHEELS; POWER TRAIN. This bulletin outlines the repair procedure to follow when the axle nut has rotated from its originally torqued position.
Subaru Service Technical2025-09-02. Other. ENGINE; ELECTRICAL SYSTEM; POWER TRAIN. Subaru Service Technical Support Newsletter special edition.
03-96-252025-05-01. Service bulletin. SUSPENSION; POWER TRAIN. 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.
Subarunet Announcement2024-08-05. Other. POWER TRAIN. This annoucement provides parts personnel information about remanufactured transmissions that will no longer be available.
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.
03-91-232024-02-02. Service bulletin. POWER TRAIN; POWER TRAIN:AXLE ASSEMBLY. 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.
16-132-20R2023-07-03. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This Service Information 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.
16-136-22R2023-07-03. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER; POWER TRAIN; ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CVT; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
16-132-20R2023-05-02. Service bulletin. POWER TRAIN. 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.
037012R2023-04-24. Service bulletin. POWER TRAIN. This Bulletin provides production change, repair procedure and parts information to address a customer concern of a high-pitched sound coming from the transmission extension housing area.
16-132-20R2023-02-06. Service bulletin. POWER TRAIN. This Service Information 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.
16-132-20R2022-12-02. Service bulletin. POWER TRAIN. 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.
03-88-222022-09-08. Service bulletin. POWER TRAIN. The bulletin announces the design change made the propeller shaft to address the small number of customer concerns regarding a growling-type sound being heard from under the vehicle when driving.

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