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Service bulletins for the 2020 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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
SubaruNet Announ2022-09-08. Service bulletin. ELECTRICAL SYSTEM. REQUIRED Information for WRK-21 Service Claims.
SubaruNet Announ2022-09-08. Service bulletin. ELECTRICAL SYSTEM. The purpose of this communication is to assist retailers with questions or concerns regarding the OTC 16-3880X videoscopes, including repairs and replacement procedures.
SubaruNet Announ2022-08-02. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM; EQUIPMENT; POWER TRAIN. Recently following the release of the WRK-21 CVT Chain Guide Breakage, SOA’s Techline started to receive some retailer inquiries regarding TCMs not accepting the testing/ temporary pak file or the final pak file and then failing to communicate.
16-132-20R2022-08-02. Service bulletin. EQUIPMENT; POWER TRAIN; EQUIPMENT ADAPTIVE/MOBILITY. 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.
15-298-222022-08-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; COMMUNICATION:MANUFACTURER TELEMATICS. This Bulletin announces the preferred practices to be used when handling vehicles equipped with Gen2 Telematics which are enrolled in the Subaru STARLINK® Security Plus Service featuring Stolen Vehicle Recovery Plus with Immobilizer.
16-139-222022-08-02. Service bulletin. EQUIPMENT; POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. The WRK-21 recall includes TCM reprogramming to prevent CVT chain slip. If, during the recall inspection, a vehicle is confirmed to have already experienced severe enough CVT chain slip, the CVT assembly will be replaced.
WRK-21R2022-08-02. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; POWER TRAIN. Subaru of America, Inc. (Subaru) is initiating a new safety and emissions Recall for certain 2019 - 2020 model year Ascent vehicles, 2020 model year turbo Legacy vehicles, and 2020 model year turbo Outback vehicles in which the Continuously Variable Transmission (CVT) chain may slip and/or break.
05-88-212022-08-02. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; SUSPENSION. This bulletin announces a design change made to the front stabilizer bushings.
09-88-222022-07-07. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This bulletin announces availability of new reprograming files for the Engine Control Module (ECM).
15-236-18R2022-07-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. 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.
18-225-222022-07-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected.
SubaruNet Announ2022-07-06. Service bulletin. POWER TRAIN; EQUIPMENT. WRK-21 rental pre-authorization.
SubaruNet Announ2022-07-06. Service bulletin. POWER TRAIN. UPDATE Subaru Safety & Emissions Recall: WRK-21 – CVT Chain Guide Breakage.
12-288-20R2022-06-03. Service bulletin. SEATS. This bulletin announces a design change made to the Slide Rail components of the left and right front power seat frame / track assembliesd.
12-203-16R2022-06-03. Service bulletin. SEAT BELTS. This bulletin provides a procedure to address customer concerns of a squeaking sound originating from where the front seat belt buckle assembly attaches to the seat frame.
15-236-18R2022-06-03. 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.
WRG-21R2022-06-03. Service bulletin. FUEL SYSTEM, GASOLINE. Subaru of America, Inc. (Subaru) is initiating a new safety recall for certain 2019-2020 MY Ascent, 2018-2019 MY BRZ, 2018 MY Forester (Turbo), 2018-2020 MY Impreza, 2018-2020 MY Legacy, 2018-2020 MY Outback, and 2018-2019 MY WRX vehicles in which the fuel pump may become inoperative.
18-218-222022-06-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin announces the Service Manual correction for the diagnostic trouble tree for DTC B281C.
16-136-22R2022-05-03. Service bulletin. POWER TRAIN; EQUIPMENT; ENGINE AND ENGINE COOLING. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
18-220-222022-05-03. Service bulletin. EQUIPMENT. The purpose of this bulletin is to provide a description of current changes to Service Manuals available via the Subaru Technical Information System (STIS) web site.
02-190-222022-04-05. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This bulletin announces the proper diagnostic procedures regarding oil leakage from the oil level switch area.
15-192-22R2022-04-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin has been developed to outline the steps for gathering basic essential information during diagnosis and repair of the Infotainment concerns. (Applicable to all models with Harman or Denso CP1 Infotainment).
16-136-22R2022-04-05. Service bulletin. POWER TRAIN. This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
15-240-19R2022-04-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin announces availability of new Harman audio unit amplifier units with revised internal logic designed to optimize efficiency while addressing customer concerns.
01-175-162022-03-04. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides helpful tips to better utilize the Subaru Select Monitor 4.

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