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Service bulletin M1520

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 id10186790
Published by NHTSA2021-02-06
Manufacturer's numberM1520
Manufacturer's date2021-01-19
NHTSA componentWHEELS; ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); UNKNOWN OR OTHER; EQUIPMENT; ENGINE AND ENGINE COOLING

NHTSA's summary

SERVICE BULLETIN M1520: 2021 INITIAL CARE. PURPOSE: The purpose of this program is to monitor Harley-Davidson quality delivered to the customers. Harley-Davidson Technical Service is providing an initial care program for a number of 2021 vehicle components. Duration of Program: January 4, 2021 through April 4, 2021.

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

Driver assistance, Engine, Equipment and accessories, Wheels

Vehicles listed
HARLEY-DAVIDSON HARLEY-DAVIDSON

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