HARLEY-DAVIDSON

M1720

2026-03-31 · NHTSA 11031172

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

Manufacturer summary

Original wording in English

SERVICE BULLETIN M1720 (REV A): PAN AMERICA ELECTRONIC CONTROL MODULE (ECM) UPDATE. PURPOSE: Initial release 3/3/2026. Revision A. 3/30/2026. Updated: Purpose for Service Bulletin and Required Dealer Action. Adjust information for 2024 models. Purpose for Service Bulletin. This bulletin informs dealers that there is an Electronic Control Module (ECM) update available for 2021-2025 RA1250, RA1250S, RA1250ST and RA1250SE on Digital Technician II (DT II). The update improves engine function by addressing engine operation after a cold start by improving idle stability and improved Quickshifter function. For 2021-2024 models the Body Control Module (BCM) and ECM update must both be completed. If only the ECM is updated, a nuisance Diagnostic Trouble Code (DTC) U040000 will populate and not be able to be cleared. Because of this, the BCM update should be done first and then the ECM.

Repeated filings are grouped only when make, bulletin number, publication date and complete summary agree. Original record numbers are retained. Older publications remain available, and an explicit later version is shown when established. Pre-1994 vehicle associations are separated from default results; an unspecified year does not mean all model years apply.