2018 Subaru Legacy Technical Service Bulletins

445 technical service bulletins (TSBs) are on record for the 2018 Subaru Legacy. 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.

• 11037943Oct 5, 2026Electrical system, Other or unknown. This announcement provides information on a new software update for the Midtronics Dss and DCA machines.
• 11037942Sep 28, 2026Transmission and drivetrain, Electrical system. This announcement provides information on an enhancement of the TechShare CVT diagnostic assitance application.
• 11037940Sep 18, 2026Other or unknown. This bulletin provides paint code information for 2027 model year vehicles.
• 11037938Sep 18, 2026Electrical system. "This Bulletin announces additional troubleshooting steps for the following DTCs: DTC C1956: RH Actuator Circuit DTC C1957: LH Actuator Circuit"
• 11037930Sep 15, 2026Other or unknown. This announcement provides an update to all 2027 model year Subaru warranty coverages for wear items and adjustments.
• 11037929Sep 14, 2026Electrical system, Other or unknown. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin.
• 11037927Sep 14, 2026Electrical system. This bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. This is an revised version of the original bulletin.
• 11036804Aug 21, 2026Transmission and drivetrain, Electrical system. This Announcement provides diagnostic assistance for CVT issues.
• 11036814Aug 20, 2026Transmission and drivetrain. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR580 model CVT transmissions used in the models listed.
• 11036810Aug 20, 2026Transmission and drivetrain. 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.
• 11036809Aug 20, 2026Transmission and drivetrain. 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.
• 11036807Aug 20, 2026Electrical system. This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw (dark/standby current) in vehicles experiencing battery drain when the ignition is off, leading to no-start conditions or frequent jump-starts.This is an revised version of the original bulletin.
• 11036806Aug 20, 2026Transmission and drivetrain. 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.
• 11036796Aug 13, 2026Electrical system. This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. (This is an revised version of the original bulletin.)
• 11036794Aug 5, 2026Electrical system. Techtips newsletter locator index.
• 11036789Aug 1, 2026Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin
• 11034249Jun 12, 2026Other or unknown. This announcement is requesting retailer staff to retain the EyeSight protective hood covers from Generation 4 EyeSight cameras.
• 11034242Jun 2, 2026Electrical system, Transmission and drivetrain. 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.)
• 11034240Jun 1, 2026Engine, Electrical system. This bulletin announces the availability of reprogramming files for the Engine Control Module (ECM) for certain vehicles equipped with 3.6L engines.
• 11033069May 18, 2026Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11033063May 13, 2026Transmission and drivetrain, Electrical system. This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability.
• 11033056May 4, 2026Transmission and drivetrain. This announcement provides information on the remanufactured CVT transmission program.
• 11033051May 1, 2026Engine. This bulletin announces the diagnostic procedures to be used when DTCs B1571(REFERENCE CODE INCOMPATIBILITY IMMOBILIZER CM TO ECM) and B1572(IMM CIRCUIT EXCEPT ANTENNA CIRCUIT) are detected by Keyless Access with Push Button Start(KACM).
• 11032034Apr 30, 2026Other or unknown. This Service Information Bulletin was developed to provide interim guidance for vehicles exhibiting DTC B2A20.
• 11032040Apr 24, 2026Transmission and drivetrain. This bulletin announces the service manual correction regarding clutch master cylinder reservoir service procedures.
• 11032039Apr 24, 2026Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11032035Apr 20, 2026Steering, Wheels. This Bulletin provides the diagnostic procedures to be followed when addressing customer concerns of steering wheel/vehicle body vibration when driving at highway speeds when tire/wheel balance is suspected.
• 11030560Mar 26, 2026Electrical 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.
• 11030557Mar 26, 2026Other or unknown. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.
• 11030567Mar 16, 2026Electrical system. This bulletin contains information to help when attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully
• 11030561Mar 4, 2026Electrical system. This announcement provides information on the use of aftermarket services or tools for programming immobilizer keys/fobs.
• 11029347Feb 25, 2026Electrical system. This Service Information Bulletin was developed to provide interim guidance for 2026 model year vehicles exhibiting DTC B2A20 with gen 4 Telematics.
• 11029329Feb 6, 2026Electrical 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.
• 11027986Jan 15, 2026Electrical system. This Subaru service and technical support line newsletter provides information on the next phase of TechShare.
• 11027982Jan 12, 2026Electrical system, Engine. This Bulletin provides the diagnostic procedure for the STARLINK® Remote Engine Start (RES).
• 11027981Jan 12, 2026Other or unknown. This announcement has been created to address difficulties with software updates on Subaru Select Monitors with DST-010 interface firmware has been updated.
• 11027083Dec 8, 2025Electrical system, Engine. This Service Information Bulletin provides the Service Manual Correction to the diagnostic procedure for DTC B2A16 (Immobilizer Key Collation Diagnosis).
• 11027081Dec 8, 2025Electrical system, Engine, Fuel system. This bulletin announces the diagnostic procedures to be used when DTCs P2096 (POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1) and P2097 (POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1) are detected by the Engine Control Module (ECM).
• 11027076Dec 8, 2025Suspension. This bulletin announces availability of new front wheel hub assemblies incorporating bearing surfaces having increased resistance to imperfections resulting from shock loads.
• 11027073Dec 2, 2025Electrical system. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure.
• 11025796Nov 20, 2025Other or unknown. Subaru service article locator.
• 11025790Nov 20, 2025Engine, Electrical system. This bulletin announces the diagnostic procedures to be used when DTCs P2096 (POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1) and P2097 (POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1) are detected by the Engine Control Module (ECM).
• 11025789Nov 20, 2025Other or unknown. Subaru service article locator.
• 11024861Nov 4, 2025Transmission and drivetrain. 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.
• 11024867Oct 29, 2025Other or unknown. This bulletin provides information on the load carrying capacity reduced label when a port-installed or retailer-installed accessory exeeds 1.5 percent of the GVWR or 100 pounds, which ever is lower.
• 11024869Oct 28, 2025Electrical system. This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw (dark/standby current) in vehicles experiencing battery drain when the ignition is off, leading to no-start conditions or frequent jump-starts.
• 11024863Oct 28, 2025Other or unknown. Subaru tech tips newsletter article locator.
• 11024859Oct 28, 2025Other or unknown. Subaru tech tips newsletter article locator.
• 11024858Oct 23, 2025Electrical system. This Bulletin outlines a comprehensive update to the dark current/parasitic draw diagnosis & testing procedures.
• 11024857Oct 23, 2025Electrical system. This Bulletin provides details on a new formal testing, charging, and tracking procedure for all 12-volt batteries in new vehicle inventory.

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