# 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.

- Type: Service bulletin
- NHTSA id: 10189980
- Published by NHTSA: 2021\-04\-06
- Manufacturer's number: M1391A
- Manufacturer's date: 2021\-03\-18
- NHTSA component: ELECTRICAL SYSTEM; EQUIPMENT

## 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\-210335J addresses new battery part numbers for 2021 models and revised menu selections.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189980-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189980-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- HARLEY\-DAVIDSON HARLEY\-DAVIDSON

JSON: [/v1/bulletins/10189980](/v1/bulletins/10189980)

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