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.
M1508
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1508 (REV D): 2009-2025 TRIKE PLATFORM - REVERSE MOTOR. PURPOSE: Revision C. To inform dealers of a running change for the new reverse motor (Part No. 83388-09C) for Trike models. As of January 28, 2020 all Trike platform vehicles will be manufactured using the new reverse motor. The new reverse motor will be used to replace reverse motor assemblies (Part No. 83388-09, 83388-09A,83388-09B) that have failed diagnostics. Refer to Table 3. This motor contains several improvements for better motor durability. A new procedure has been added, Refer to PINION EXTENDS BUT REVERSE MOTOR STALLS OR SPINS SLOWLY. REV D: Updated: Guide. Add link to: PINION EXTENDS BUT REVERSE MOTOR STALLS OR SPINS SLOWLY
M1727
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1727: BIG TWIN INNER PRIMARY SEAL CHANGES. PURPOSE: Initial release. This bulletin informs dealers of changes to the Inner Primary Seal (Part No. 12052). The seal part number was changed from (Part No. 12052A, black in color) to (Part No. 12052B, brown in color). A new Inner Primary Seal (Part No. 12052C) has been released and the color has been changed back to black.
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.
M1650
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1650: MILWAUKEE EIGHT AND TWIN CAM CAMSHAFT DRIVE GEAR RETENTION KIT CHANGES. PURPOSE: This bulletin informs dealers that changes have been made to the Camshaft Drive Gear Retention Kit and service proceduresfor the Milwaukee-Eight and Twin Cam applications. In an effort to increase the clamp load of the camshaft drive sprocket bolted joint and prevent the drive bolt from loosening in high lift camshaft applications, the following changes have been made: a. The camshaft drive bolt final torque has been increased to 40 ft-lbs (54 N·m) for all Milwaukee-Eight and certain Twin Cams models. See Vehicles Affected. This increase in torque will make the bolt a one time use application. Never re-use a camshaft drive bolt for service after tightening to the increased specification. See service manual for updated procedure. b. A new camshaft drive gear retention kit (Part No. 91800088) has been created. This new kit is compatible with all Milwaukee-Eight and Twin Cam engines using Parts and Accessories (P&A) camshaft and Original Equipment (OE) camshaft applications. See Instruction sheet for specific fitment on Twin Cam OE camshaft applications. The new kit utilizes friction washers to prevent unwanted rotation of components in the drive sprocket bolted joint under stress. The use of liquid threadlocker on the threads of the bolt and pre-lube to the head of the bolt flange and outside of the washer help the bolt reach full stretch when tightening. NOTE: Engines produced at all Harley-Davidson Motor Company (HDMC) plants will not come with the new kits installed. They will continue to be produced with (Part No. 25566-06).
M1555
Warranty Program/Extension
SERVICE BULLETIN M1555 (REV E): BATTERY WARRANTY GUIDELINES. PURPOSE: Revision E. Added: Added procedures for the DCA-8000 E Battery Tester.* Updated: All sections. This bulletin informs the dealership network that Harley-Davidson has provided guidelines for battery warranty.
PAB1158
Service Bulletin/Repair Instructions
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1158: OIL FILTER PACKAGING AND CASE QUANTITY UPDATE. PURPOSE: To inform dealerships that Harley-Davidson has made updates to oil filters including new part numbers, packaging design, and bulk case quantity changes.
M1612
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1612 (REV A): MILWAUKEE-EIGHT AND TWIN CAM TRANSMISSION GEAR PACKS. Purpose: Revision. Update: Notes for Table 3 and 4. * Updated: Part Numbers. This bulletin informs dealers that all: Twin Cam gear packs on CVO, Dyna, Police, Softail, Touring & Trike models and Milwaukee-Eight gear packs on CVO, Police, Softail, Touring & Trike models ordered after December 04, 2023 will not come with the shift drum, forks, shafts and related hardware. Models Affected: 2006-2017 Twin Cams: Dyna models 2007-2016 Twin Cams: CVO, Police, Touring and Trike models 2007-2017 Twin Cams: Softail models 2017-2024 Milwaukee-Eight: CVO, Police, Touring and Trike models 2018-2024 Milwaukee-Eight: Softail models
PAB1146
Service Bulletin/Repair Instructions
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1146: 68193-95 BULB WEDGE, FENDER TIP LAMP. Purpose: To inform dealers of an issue with the bulb wire terminals not being to specification. The light bulbs were used in numerous front and rear fender tip light assemblies for domestic and international applications.
M1464
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1464: BOOM! AUDIO - GENERAL INFORMATION AND SOFTWARE UPDATE 1.22.X. PURPOSE: Revision. This bulletin helps the dealer locate needed information to update and service Boom! Box Audio Infotainment systems. It also lists software revisions and the fixes addressed in each revision. This bulletin also replaces the following documents: TT431A: Software Download and Warranty Information, M1346: Boom! Box Audio System Software Update, M1344E: Boom! Box Infotainment System General Information and Procedures, M1442: Box Infotainment System General Information and Software Release 1.21.X Description, and The Boom! Box Infotainment System Job Aid located on h-dnet.com
PAB1097
Service Bulletin/Repair Instructions
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1097 INTERNATIONAL FITMENT: THE BOOM! BOX GTS SOFTWARE UPDATE. PURPOSE: To notify International dealers that International GTS radios are now available to be ordered and installed in 2014-2018 Touring, CVO Touring and Trike models previously equipped with 6.5 GT radios as retrofittable with additional parts and software as noted. Markets Affected: Only international markets are affected.
1HD-D8A8J-03
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1359: 2014 - 2016 TOURING - HYDRAULIC CLUTCH LINE REPLACEMENT. PURPOSE: REVISION. A leak may occur on some Touring, CVO Touring, Police Touring and Trike models equipped with hydraulic clutch. The leak may occur when the line is replaced or when a P&A clutch line is installed. The area of the leak is at the joint where the clutch line attaches to the secondary clutch actuator (right side of the transmission). Required Dealer Action: Use Snap-on Flare Nut Socket (Part No. GAN85087B) and Snap-on Torque Wrench (Part No. QJR117F or similar) to tighten flare nut. Each time clutch line is installed or torque is adjusted to determine if leak is still present, bleed the clutch system.
1HDM5V2A05
Service Bulletin/Repair Instructions
TECH ARTICLE TA0023: TA0023: Crankshaft Rod Bearing. Purpose: Technicians have been falsely identifying connecting rod bearings as failed due to a perception of resistance as the rods are rotated. The clearance of the Twin Cam and Milwaukee-Eight® crank pin bearings are maintained to a very tight range. This optimizes performance and maintains low mechanical noise in operation. The connecting rod bore can also distort slightly in operation due to stress relaxation. As a result, bearing clearance decreases due to the contact zone broadening and the load being distributed over more rollers. The combination of a bore being slightly out of round and reduced bearing clearance can result in varying degrees of resistance through the range of motion. Axial clearance is also tightly controlled for proper alignment. For these reasons, zones of resistance can be found when the connecting rods are rotated by hand through their range of motion. Resistance during rod motion, by itself, is not an indication of a performance or durability concern.
M1416
Service Bulletin/Repair Instructions
The purpose of this service bulletin is to communicate updates and corrections to certain 2008-2016 service literature.
1HDS7V9Q11
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1458: 2009 - 2018 TRIKE - SERVICE MANUAL SUPPLEMENT UPDATE. The purpose of this bulletin is to communicate updates to thereverse motor inoperative diagnostic procedure in the service manual supplement. A high percentage of reverse motors that have been returned are in good condition. The belief is that the 150 A circuit breaker is tripped, and not fully reset. This is causing the technician to replace good parts that they believe are faulty.
1HDG3S9W10
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1442: BOOM! BOX INFOTAINMENT SYSTEM GENERAL INFORMATION AND SOFTWARE RELEASE 1.21.X DESCRIPTION. This bulletin helps the dealer locate needed information to update and service Boom! Box Audio Infotainment systems. It also lists software revisions and the fixes addressed in each revision.
1HD-K8Y7Z-09
Service Bulletin/Repair Instructions
SERVICE BULLETIN M1446: BIG TWIN LONG BLOCK REPLACEMENT ENGINE, REVISION. Purpose is updated dealer action for Twin Cam engines for warranty or as replacement engines. Starting on June 1, 2017 HDMC (Harley-Davidson Motor Company) is no longer offering full engine replacement for model years 2014-2016 Touring Twin Cam engines. Starting on September 1, 2017 HDMC is no longer offering full engine replacement for model years 2014-2017 Softail, Dyna and CVO Softail Twin Cam engines.
1HD-R7V8M-09
Service Bulletin/Repair Instructions
PARTS & ACCESSORIES BULLETIN PAB1067: SCREAMIN? EAGLE SMART TUNE PRO RELEASED FOR SHIPMENT. Purpose is to notify dealers that the Smart Tune PRO ? Automatic Tuning Module is 50-state U.S. EPA approved and released for shipment.
1HD-Y6J2F-02
Service Bulletin/Repair Instructions
TECH ARTICLES: INSTALLATION OF BOOM! INFOTAINMENT SOFTWARE RELEASE 1.20.2 MAY CAUSE THE INFOTAINMENT SYSTEM TO FREEZE AND BECOME NON-RESPONSIVE TO INPUTS FROM THE HAND CONTROLS, SOFT KEYS, OR TOUCH SCREEN. AN IGNITION CYCLE OFF-ON MAY GET THE SYSTEM TO RESPOND OR IT MAY NOT. IF A CUSTOMER IS EXPERIENCING THIS ISSUE, UPDATE SOFTWARE TO RELEASE 1.20.3.
1HD-Q4H7G-02
Service Bulletin/Repair Instructions
Service Bulletin M1430B: BOOM! BOX INFOTAINMENT SYSTEM GENERAL INFORMATION AND SOFTWARE RELEASE 1.20.X DESCRIPTION informs the dealer network that Boom! software version 1.20.3 released December 19, 2016 and is now available to download. This also provides notice that revision 1.20.2 was found to be corrupt. Do not install version 1.20.2 and delete any stored copies.
1HD-K5W9P-01
Service Bulletin/Repair Instructions
THIS BULLETIN HELPS THE DEALER LOCATE NEEDED INFORMATION TO UPDATE AND SERVICE BOOM! BOX AUDIO INFOTAINMENT SYSTEMS. IT ALSO LISTS SOFTWARE REVISIONS AND THE FIXES ADDRESSED IN EACH REVISION.
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.
M1409A
Service Bulletin/Repair Instructions
This bulletin is to inform dealers of the steps to perform after performing the Touring and Trike Rear Shock absorber callback return. The shipping plug must be transferred from the new shock to the return shock. When oil is allowed to leak during the return process, the call-back issue cannot be properly diagnosed. Installing the plug in the return shock contains the oil in the shock during the shipment to the supplier. This information applies to 2014-2016 Touring and Trike models with rear air shock absorbers.