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Service bulletin 06-77-20R

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 id10179382
Published by NHTSA2020-09-04
Manufacturer's number06-77-20R
Manufacturer's date2020-08-12
NHTSA componentELECTRICAL SYSTEM; SERVICE BRAKES, ELECTRIC; ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC)

NHTSA's summary

This bulletin announces the availability of reprogramming files to optimize the control module for the Vehicle Dynamics Control system (VDCCM).

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

Brakes, Driver assistance, Electrical system

Vehicles listed
SUBARU LEGACY2015, 2016, 2017, 2018
SUBARU OUTBACK2015, 2016, 2017, 2018
SUBARU WRX2016, 2017, 2018

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

Recalls for the same vehicles and component
20223952022-07-21. Brakes
18V7730002018-11-01. ELECTRICAL SYSTEM:SOFTWARE; FUEL SYSTEM, GASOLINE
16V5760002016-08-03. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER; SUSPENSION
16V2510002016-04-27. ELECTRONIC STABILITY CONTROL (ESC)
15V3660002015-06-12. FORWARD COLLISION AVOIDANCE: CRASH IMMINENT BRAKING; EXTERIOR LIGHTING:BRAKE LIGHTS:SWITCH

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
SubaruNet Announcement (M2026-10-05. Other. This announcement provides information on a new software update for the Midtronics Dss and DCA machines.
SubaruNet Announcement (T2026-10-05. Other. This announcement provides information on an enhancement of the TechShare CVT diagnostic assitance application.
18-244-262026-10-05. Service bulletin. "This Bulletin announces additional troubleshooting steps for the following DTCs: DTC C1956: RH Actuator Circuit DTC C1957: LH Actuator Circuit"
15-333-25R2026-10-05. Service bulletin. 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.
15-304-22R2026-10-05. Service bulletin. 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.
15-308-23R2026-09-03. Service bulletin. 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.
SubaruNet Announcement (C2026-09-03. Other. This Announcement provides diagnostic assistance for CVT issues.
15-304-22R2026-09-03. Service bulletin. 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.)
Article Locator2026-09-03. Other. Techtips newsletter locator index.
15-333-25R2026-09-03. Service bulletin. 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