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Service bulletin M1391A

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 id10168818
Published by NHTSA2019-12-05
Manufacturer's numberM1391A
Manufacturer's date2019-11-04
NHTSA componentELECTRICAL SYSTEM

NHTSA's summary

SERVICE BULLETIN M1391A: MIDTRONICS GRX-3110 SOFTWARE UPDATE. PURPOSE: REVISION. This bulletin is to inform the dealer network that a software update to the GRX-3110 is now available. HD BATTERY DIAGNOSTIC STATION (PART NUMBER: GRX-3110HD). Update 192-210335I addresses the additional part numbers for batteries.

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

Vehicles listed
HARLEY-DAVIDSON HARLEY-DAVIDSON

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