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Service bulletins for the 2021 Subaru Ascent

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.

384 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
15-255-19R2022-01-04. Service bulletin. ELECTRICAL SYSTEM. Map Data Update Procedure for Harman Gen 3.1 Navigation Equipped Head Units.
15-236-18R2022-01-04. Service bulletin. 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.
15-251-19R2021-11-02. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16.
15-287-212021-11-02. Service bulletin. ELECTRICAL SYSTEM. This bulletin announces the availability of diagnostic information regarding accessory remote engine start systems.
SubaruNet Announ2021-11-02. Service bulletin. ELECTRICAL SYSTEM. Effective today (October 1, 2021), the recommended replacement battery for the 19-21 MY Ascent models is changing from the SOA821B200 Flooded Battery to the SOA821B600 Enhanced Flooded Battery (EFB).
15-195-16R2021-10-04. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides important information regarding diagnosis and replacement (when applicable) of the STARLINK Telematics Data Communication Module (DCM) along with a new claim submission requirement.
15-236-18R2021-10-04. Service bulletin. EQUIPMENT; 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.
15-240-19R2021-10-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
07-199-21R2021-10-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides additional information for the diagnostic procedures concerning measurement of dark current (a.k.a. standby current).
07-198-212021-09-04. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. This bulletin announces availability of new starter motors and ECM reprogramming files created to address some reports of excessive noise while cranking the engine.
07-199-21R2021-09-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides additional information for the diagnostic procedures concerning measurement of dark current (standby current).
15-236-18R2021-08-05. Service bulletin. 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.
07-199-212021-08-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides additional information for the diagnostic procedures concerning measurement of Dark Current (a.k.a. Standby Current).
15-236-18R2021-07-03. Service bulletin. 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.
01-167-08R2021-07-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models
07-195-212021-07-03. Service bulletin. LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM. This bulletin outlines changes in the service procedure for replacement of the Power Rear Gate control module.
05-85-21R2021-05-05. Service bulletin. ELECTRICAL SYSTEM; WHEELS. This bulletin announces a design change made to the TPMS valve assemblies.
15-282-21R2021-05-04. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides additional procedures and a detailed flow chart to use when diagnosing customer concerns regarding operation of the STARLINK RES feature.
Subarunet Announ2021-04-02. Service bulletin. ELECTRICAL SYSTEM. In January 2021, the replacement battery application for all Ascent and 2017- 2021 Impreza models were changed from part number SOA821B200 to part number SOA821B600.
Subarunet Announ2021-03-04. Service bulletin. ELECTRICAL SYSTEM. SOA821B600 Battery Supersession
07-190-212021-03-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This bulletin announces a change made to the MFD software to keep the affected units listed below compliant with Apple® CarPlay® certification.
07-184-20R2021-03-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; VISIBILITY:POWER WINDOW DEVICES AND CONTROLS. This bulletin announces a design change made to the power window main switches.
15-221-18R2021-03-04. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides helpful information about operating conditions observed in the field for Technicians to use when diagnosing customer concerns which may arise while operating Harman Gen 3 Navigation and Display Audio systems.
15-236-18R2021-03-04. Service bulletin. EQUIPMENT; 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.
15-240-19R2021-03-04. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency.

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