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Service bulletins for the 2018 Subaru Impreza

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.

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

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By component

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Bulletins, newest first
WUA-86R2021-07-03. Service bulletin. ELECTRICAL SYSTEM. In the interest of customer satisfaction, Subaru of America, Inc. (Subaru) is initiating a service program to update the Harman Kardon head unit on certain vehicles with the latest version of software.
09-51-08R2021-07-03. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. This bulletin is to advise of SOA’s revised catalytic converter recycling program shipping procedure.
15-254-19R2021-07-03. Service bulletin. ELECTRICAL SYSTEM. Map Data Update Procedure for Harman Gen 3.0 Navigation Equipped Head Units (H/U)
02-187-212021-07-02. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin outlines changes in the service procedure for engine oil pressure inspection.
15-279-21R2021-06-03. Service bulletin. ELECTRICAL SYSTEM. Subaru of America, Inc. (SOA) will be offering all active Gen1 STARLINK subscribers a complimentary Data Communication Module (DCM) update at any Subaru retailer for a predetermined period ending in February 2022. (Manual Transmission Vehicles with Push Button Start ONLY).
WRE-21R2021-06-03. Service bulletin. ENGINE AND ENGINE COOLING. Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 model year Impreza and 2018-2019 model year Crosstrek vehicles to check and, if necessary, update the ECM programming, and to replace all four ignition coils in each vehicle.
18-209-212021-06-02. Service bulletin. EQUIPMENT. Description of current changes to Service Manuals available via the Subaru Technical Information System (STIS) web site.
Subarunet Announ2021-06-02. Service bulletin. ELECTRICAL SYSTEM. Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 model year Impreza and 2018-2019 model year Crosstrek vehicles to check and/or update the ECM programming, and to replace all four ignition coils in each vehicle.
09-74-21R2021-06-02. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components.
12-319-212021-05-05. Service bulletin. STRUCTURE. This bulletin announces design changes made to the front and rear door glass run channels.
05-85-21R2021-05-05. Service bulletin. ELECTRICAL SYSTEM; WHEELS. This bulletin announces a design change made to the TPMS valve assemblies.
WRE-21R2021-05-05. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 model year Impreza and 2018-2019 model year Crosstrek vehicles to check and, if necessary, update the ECM programming, and to replace all four ignition coils in each vehicle.
WUQ-02R2021-05-04. Service bulletin. ENGINE AND ENGINE COOLING. "This recall (WUQ-02) has been expired and superseded to the WRE-21 recall."
Subarunet Announ2021-05-04. Service bulletin. ENGINE AND ENGINE COOLING. Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 model year Impreza and 2018-2019 model year Crosstrek vehicles to check and/or update the ECM programming, and to replace all four ignition coils in each vehicle.
15-240-19R2021-05-04. Service bulletin. EQUIPMENT. This bulletin announces availability of new audio unit amplifier units with revised internal logic designed to optimize efficiency.
15-280-21R2021-05-04. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Vehicles equipped with manual transmission and push-button start will follow DCM replacement procedure as outlined in TSB 15-279-21: Gen1 Telematics DCM Replacement for 3G Sunset which is applicable to manual transmission vehicles with push-button start ONLY.
Subarunet Announ2021-05-04. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. Subaru of America, Inc. (Subaru) is recalling certain 2017-2019 model year Impreza and 2018-2019 model year Crosstrek vehicles to check and/or update the ECM programming, and to replace all four ignition coils in each vehicle.
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.
06-82-212021-04-02. Service bulletin. SUSPENSION. This bulletin provides a service procedure to address a squeaking-type sound from the rear suspension area customers may hear when going over bumps.
15-280-21R2021-04-02. Service bulletin. ELECTRICAL SYSTEM. Gen1 Telematics Reprogramming for 3G Sunset.
11-200-20R2021-03-05. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This bulletin announces the availability of reprogramming files to optimize the Engine Control Module (ECM).
05-76-20R2021-03-04. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; WHEELS:HUB. This bulletin announces availability of new front wheel hub assemblies incorporating bearing surfaces having increased resistance to imperfections resulting from shock loads.
Subarunet Announ2021-03-04. Service bulletin. ELECTRICAL SYSTEM. SOA821B600 Battery Supersession
12-312-212021-03-04. Service bulletin. EQUIPMENT; STRUCTURE. This bulletin announces availability of new center console armrest covers to address the a wrinkling condition.
14-27-212021-03-04. Service bulletin. ENGINE; EQUIPMENT. This bulletin announces the upcoming issuance to all retailers of an essential tool update kit for the Engine Support Assembly Kit #J-50135-A.

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