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 26.0.2): 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). New Software Update Version 26.0.2. Release Date: Week of November 18, 2025. New Features, Changes. 2026 Vehicles, 2025 Softail and LiveWire S2DM/MH/AP EV3. NOTE: Digital Technician II (DT II) supports additional Harley-Davidson motorcycle models and model years outside of those listed.
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.
M1555
Warranty Program/Extension
SERVICE BULLETIN M1555 (REV F): BATTERY WARRANTY GUIDELINES. PURPOSE: [Revision F. Added: Added video link for the DCA-8000 Battery Tester. Added: Supplemental Procedure Video.] This bulletin informs the dealership network that Harley-Davidson has provided guidelines for battery warranty.
1HD-L9F4N-11
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1466: STREET - UPPER STEERING HEAD BEARING SEAL. REVISION. Purpose: This bulletin informs dealers that Harley-Davidson has developed a new upper steering head bearing seal for fitment on Street models. The new seal replaces the current seal on the upper steering head bearing only. The lower steering head bearing seal will still use the current seal. Current service procedures and specifications remain the same.
1HDL9W5L10
Service Bulletin/Repair Instructions
TECH ARTICLE TA0001: 2014 and Later Sportsters - Rear Brake Sound. A customer reports a sound (similar to a groan) from the rear of the vehicle and/or the rear brake area during rear brake application under 7 mph. Explain to the customer that this is the result of a normal harmonic resonance at certain frequencies. It is not detrimental to motorcycle operation, performance or durability.
1HD-X3W8C-02
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1437: NON-COMPLIANCE RECALL 0624 - PHILIPPINE 2015 XG500 EMISSIONS, NOTIFIES THAT CERTAIN MODEL YEAR 2015 AUSTRALIAN CONFIGURATION XG500 VEHICLES WERE SHIPPED TO THE PHILIPPINES DEALER-DIRECT MARKET AND DO NOT COMPLY WITH THE TAILPIPE EMISSION REQUIREMENTS WHICH IS SPECIFIED BY SECTION 22, CHAPTER II OF REPUBLIC ACT 8749 (CLEAN AIR ACT OF 1999) IN RELATION TO PART IX, RULE XXXI OF DENR ADMINISTRATIVE ORDER 2000-81 (IMPLEMENTING RULES AND REGULATIONS OF RA8749) REQUIRED FOR THIS MARKET.
TA0006
Service Bulletin/Repair Instructions
Harley-Davidson is aware of conditions that may result in a streaking appearance or film residue on the inside of some instrument gauges including speedometer and tachometers. This may occur after exposure of the vehicle to humid conditions. This condition may remain even after the moisture has evaporated.
TT450
Service Bulletin/Repair Instructions
Difficulty starting engine or engine starts and stalls at idle. Improperly routed starter cable near the bank angle sensor (BAS) can cause this condition.
SB-M-1401
Service Bulletin/Repair Instructions
HARLEY-DAVIDSON: TSB CONTAINS OWNER NOTIFICATION LETTER. SELECT DOCUMENT SEARCH BUTTON BELOW. SOME MOTORCYCLES HAVE AN ISSUE WITH INSTALLATION TORQUE ON SCREWS ON THE RIGHT SIDE RIDER FOOT CONTROL MOUNTING AND NO CHARGE REPAIR IS PROVIDED. MODEL 2015 STREET XG500, XG750. *PE
SB-M-1384
Service Bulletin/Repair Instructions
HARLEY DAVIDSON: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. SAFETY RECALL 0161. ON CERTAIN MOTORCYCLES, THE FUEL TANK FILLER NECK IS NOT ALLOWING FUEL CAP TO SEAL PROPERLY TO FUEL TANK CAUSING IT TO LEAK. MODEL 2015 XG500, XG750. *PE