Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
M1490
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1490 (V 26.8.3): DIGITAL TECHNICIAN II - UPDATES AND RELEASE NOTES. PURPOSE: Revision. This bulletin informs dealers that Harley-Davidson has made a software update to Digital Technician II (DT II). DIGITAL TECHNICIAN II (PART NUMBER: HD-48650). Version Version 26.8.3, Release Date: Week of July 24, 2026. NOTE: Software version (26.4.3) will need to be manually installed only if current software version of DT II is (26.0.2). After (26.4.3) is manually installed, automatic updates will bring DT II to the latest software version. Refer to bulletin M1713 for instructions. New Features - Harley-Davidson: 2023-2024 Touring: Updated Electronic Control Module (ECM) calibration offerings. LiveWire: S2DM/MH/AP: Calibration bundle 10.2.28: Telematic Control Unit (TCU) reflash updates. Change: Vehicle Setup: Body Control Module (BCM) – Tire Pressure Monitoring System (TPMS) Replacement: Correct issue where tire size selections were not available. System Info – Auxiliary Load Controller (ALC): Added Bike configuration field. Data Items – Trike ECM: Improved display of Gear Position when in reverse. Amp – Added support for (Part No. 76001619).
M1731
Service Campaign
SERVICE BULLETIN M1731: PRODUCT PROGRAM 0931 - 2025 SOFTAIL OIL DIPSTICK. PURPOSE: Initial Release. This bulletin informs dealers that Harley-Davidson has chosen to offer a replacement dipstick for 2025 Softail motorcycles. When used with a new oil level check procedure (check Upright instead of on Jiffy Stand), the new dipstick (Part No. 62700380) provides a more accurate reading of the oil level in the oil pan and reduces the possibility of overfilling. Harley-Davidson is conducting a Product Program (0931) to offer this dipstick replacement at no charge to owners of the affected vehicles.
M1722
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1722 (REV A): EXHAUST SMOKE, OIL CARRY-OVER OR MILKY OIL (M8 MODELS WITH TRANSMISSION-MOUNTED BREATHER). PURPOSE: Revision A. Purpose for Service Bulletin. This bulletin informs dealers about: • The cause and effects of moisture in engine oil. • Service Manual troubleshooting updates for Milwaukee-Eight engines with the transmission-mounted breather, that have symptoms of moisture in oil and the best practices to avoid creating such instances. • New Job Time Code (JTC 3017 Diagnose Oil Carryover/Moisture) for service manual troubleshooting.
M1679
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1679: AFTERMARKET EXHAUST HEADER DEBRIS. PURPOSE: Initial release. This bulletin informs dealers that Harley-Davidson has identified instances of premature engine failure due to abrasive particle wear, specifically from debris inside new aftermarket exhaust headers. Recent evaluations have identified that certain newly manufactured exhaust headers may contain residual hard particles that, if not removed prior to installation, can migrate through the engine system and cause accelerated component wear or severe mechanical damage.
M1713
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1713 (REV C): DTII UPDATE PROCEDURE FOR SOFTWARE VERSION (26.4.3). PURPOSE: Revision C. This bulletin informs dealers that an issue was discovered in the Digital Technician II (DT II) software version (26.0.2), released on November 18, 2025. The issue prevents automatic software updates to be installed on your DT II computer. A manual installation of the latest DT II software version (26.4.3) will need to be performed if current DT II software version is (26.0.2), to allow future automatic updates. If a manual update to (26.1.5) or (26.3.2) has previously been completed, DT II will automatically update to (26.4.3) and no additional action is needed.. Revision C. Updated: Purpose for Service Bulletin and Required Dealer Action. Updated to Software Version (26.4.3).
M1707
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1707 (REV A): 2025 SOFTAIL BCM UPDATE. PURPOSE: Revision A. This bulletin informs dealers that there is a Body Control Module (BCM) update available for 2025 Softail models. This update will be available in Digital Technician II (DT II) version 26.0.1 or later. This update is to address a number of concerns and also provide functional improvements. Revision A: Updated: Vehicles Affected. Add 2026 Softail models (Until Build Date of December 15, 2025).
M1706
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1706: 2025 SOFTAIL INSTRUMENT MODULE UPDATE. PURPOSE: Initial Release. This bulletin informs dealers that there is an update available for the 2025 Softail Instrument Module (IM). This update is intended to address two symptoms: Diagnostic Trouble Code (DTC) U014000 populating with no actual fault present, RPM display flashing. The update is available in Digital Technician II (DT II) version 26.0.1 or later.
W146
Warranty Program/Extension
WARRANTY BULLETIN W146 (REV C): TIRE TREAD DEPTH GUIDE-UPDATE. PURPOSE: [Revision C. Updated: Tire Tread Depth Guide. Add tire part numbers 43100063, 43200035,43100029A, 43100033A and 43200045A.] To provide tire tread depth specifications for the dealership network to consult when filling warranty claims on used tires. Please see the Warranty Manual of your region for tire policy guidelines.
M1391A
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1391A (REVU): MIDTRONICS GRX-3110 AND DCA-8000 SOFTWARE. PURPORSE: Revision U. The purpose of this bulletin is to inform the dealer network that a software update to the GRX-3110 and DCA-8000 is now available. DYNAMIC DIAGNOSTIC CHARGER SYSTEM (PART NUMBER: DCA-8000). [Rev U] Added: Description of improvements made to the testing algorithm for GRX software Version P and DCA-8000 software Version E.
PAB1171
Service Bulletin/Repair Instructions
GENUINE MOTOR PARTS AND ACCESSORIES BULLETIN PAB1171 (REV B): SOFTWARE UPDATE FOR SCREAMIN EAGLE PRO STREET TUNER. PURPOSE: Revision B. Updated: Summary. The App has returned to the Apple App Store. This bulletin informs dealers that a recent software update to the Screamin' Eagle Pro Street Tuner application will require the use of a Personal Computer (PC) to complete a Bluetooth Communication Interface (BCI) firmware update.
M1684
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1684: MARKET SPECIFIC BATTERY INTRODUCTION. PURPOSE: Initial Release. This bulletin informs dealers of the availability of new batteries for new Original Equipment (OE) vehicle production and in the Parts and Accessories (P&A) catalog. Availability of the new Absorbed Glass Mat (AGM) batteries will vary by market and will be transitioning over the next few months. NOTE: The ring terminal screws are not compatible between Leoch and East Penn batteries. The new batteries will include new ring terminal screws, which must be used. The ring terminal screws from the old battery need to be discarded.
M1698
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1698: BILL OF MATERIALS CHANGE FOR CENTER-COOLED WARRANTY REPLACEMENT ENGINES. PURPOSE: Initial release. This bulletin informs dealers that starting on August 1, 2025, the Milwaukee-Eight Center-Cooled Direct Ship Warranty engines will not come with the decorative camshaft cover or Variable Valve Timing (VVT) solenoid. This involves all: • Non-VVT equipped Touring and Softail models • VVT solenoid equipped CVO models. NOTE: On VVT models, the solenoid opening will be plugged to prevent contamination.
M1668
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1668 (REV A): 2025 SOFTAIL INITIAL CARE PURPOSE: This bulletin informs dealers about the 2025 Softail Initial Care program. This Initial Care program has ended as of April 29, 2025 and parts in Table 3 no longer require Pre-Authorization for repairs. REV A. * Updated: Purpose for Service Bulletin. Ending of Initial Care Program.
M1555
Warranty Program/Extension
SERVICE BULLETIN M1555 (REV H): BATTERY WARRANTY GUIDELINES. PURPOSE: This bulletin informs the dealership network that Harley-Davidson has provided guidelines for battery warranty. REV H. Update section headers: AGM and Lithium-Iron Phosphate Batteries. Add graphics and callouts. Updated: Information on Battery.
M1681
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1681: EARLY PRODUCTION 2025 SOFTAIL ENGINE OIL OVERFILL. PURPOSE: This bulletin informs dealers that the engine oil of a limited range of 2025 Softail models was overfilled at the assembly plant. This can cause temporary smoking from the exhaust pipe.