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Service bulletin M1588

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 id10237435
Published by NHTSA2023-06-06
Manufacturer's numberM1588
Manufacturer's date2023-05-26
NHTSA componentENGINE AND ENGINE COOLING; EQUIPMENT

NHTSA's summary

SERVICE BULLETIN M1588: TOOL REQUIREMENT FOR 2023 CVO ROAD AND STREET GLIDE. PURPOSE: This bulletin informs dealers that for the new 2023 CVO Road Glide and CVO Street Glide a tool for bleeding the coolant systems is no longer just recommended, but required to complete the bleed properly. This service cannot be performed properly without this tool.

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

Engine, Equipment and accessories

Vehicles listed
HARLEY-DAVIDSON FLHXSE2023
HARLEY-DAVIDSON FLTRXSE2023

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