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Service bulletin 16-139-22

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10216977
Published by NHTSA2022-08-02
Manufacturer's number16-139-22
Manufacturer's date2022-07-08
NHTSA componentEQUIPMENT; POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Equipment and accessories, Transmission and driveline, Software

Vehicles listed
SUBARU ASCENT2019, 2020, 2021, 2022
SUBARU LEGACY2020
SUBARU OUTBACK2020

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
15-236-18R2023-07-03. Service bulletin. 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.
15-246-19R2022-02-04. Service bulletin. This bulletin outlines a new required procedure to follow when performing immobilizer-related repairs on the 2020-22 Legacy and Outback.
Subaru Starlink2020-10-05. Service bulletin. Update your STARLINK Multimedia Software and Navigation Maps.
Subarunet Announ2020-09-04. Service bulletin. Concern with latest 2020 MY Legacy / Outback Gen 4 CP1 FOTA Software Update.
11-200-20R2020-06-02. Service bulletin. This bulletin announces the availability of reprogramming files to optimize the Engine Control Module (ECM) for hard starting in sub-freezing temperatures, DTC P0400, and surging in high altitudes.
GEN 3-12019-05-28. Service bulletin. Immediately discontinue the use of latest 2019 MY Gen 3.1 Harman Software update.
15-236-18R2019-05-28. Service bulletin. 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 above. The procedure will involve either downloading the software update files from Subarunet (or using those sent directly from Nuspire) and transferring them onto a flash drive for head unit installation. It is VERY IMPORTANT to read and understand this information completely to understand all changes from prior releases before proceeding.
15-220-18R2018-12-10. Service bulletin. This bulletin provides troubleshooting steps to use when diagnosing concerns of the Apple CarPlay and/or Android Auto feature not connecting or launching properly when a compatible device is connected to the head unit.