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Service bulletin 1HDM8U7G04

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 id10135421
Published by NHTSA2018-05-07
Manufacturer's number1HDM8U7G04
Manufacturer's date2018-03-08
NHTSA componentELECTRICAL SYSTEM:SOFTWARE

NHTSA's summary

SERVICE BULLETIN M1391A: MIDTRONICS GRX-3110 SOFTWARE UPDATE. The purpose of this bulletin is to inform the dealer network that a software update to the HD BATTERY DIAGNOSTIC STATION (PART NUMBER: GRX-3110HD) is now available. This update addresses a print issue discovered in the Japan market. Also, there is an update to the alpha numeric key pad to make it more consistent when entering a VIN (Vehicle identification number) and battery date code.

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, Software

Vehicles listed
HARLEY-DAVIDSON HARLEY-DAVIDSON

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