2015 Harley-Davidson Flhtkl TSBs

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.

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.

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 25.8.9 Release Date: Week of September 2, 2025. Changes: LiveWire 2024 S2MH: Removal of incorrect Electro Hydraulic Control Unit (EHCU) reflash support; EHCU Module (Part No. 41100123): Addressed issue where module became unrecoverable after failed reflash attempted. NOTE: Digital Technician II (DT II) supports additional Harley-Davidson motorcycle models and model years outside of those listed.

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 25.6.4, Release Date: Week of August 19, 2025. Includes New Features and Changes for the Models & Model Years listed. NOTE: Digital Technician II (DT II) supports additional Harley-Davidson motorcycle models and model years outside of those listed.

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 Nm) 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).

PURPOSE: To inform dealerships that Harley-Davidson has made updates to oil filters including new part numbers, packaging design, and bulk case quantity changes.

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.

PURPOSE: REVISION. Updated: 2014-2019 to 2014 and later Touring vehicles, and VEHICLES AFFECTED. Harley-Davidson motorcycles are designed, manufactured and tested to be operated with both of the riders hands on the handlebar. If you or a customer are experiencing a handling concern, refer to the TROUBLESHOOTING, HANDLING, IRREGULARITIES found in the MAINTAINANCE chapter of the appropriate service manual. The service manual process is not intended to validate factory settings, but rather to be used if a concern is presented. Through extensive testing, Harley-Davidson has developed the service manual specification and adjustment procedure as the optimum steering head bearing adjustment and verification method to achieve the desired handling characteristics across all speeds and conditions. Addressing a perceived feel of low speed wobble, oscillation or free play by adjusting the steering head bearings beyond the service manual specification may have an adverse effect on motorcycle stability.

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.

BOX GTS - FITMENT UPDATE. PURPOSE: Revision. To inform dealers of the upcoming software change expanding the Boom! Box GTS radio fitment from 2019-later Touring to 2014-later Touring. GTS radios with the revised part numbers will be capable of being installed on 2014-later vehicles. Instructions covering the required parts and installation process will be included. Updated Markets Affected for clarification of markets (North America Market Only). Genuine Harley-Davidson vs. Aftermarket and parts will be available on November 29, 2019.

Purpose: During recent dealer visits to observe steering head bearing adjustment process, Harley-Davidson staff observed that some dealers are not correctly following the service manual steering head bearing adjustment process. Issue: Steering head bearings on 2014 and later Touring, CVO Touring and Police Touring motorcycles which may not have been adjusted correctly using the service manual procedure at dealerships. Resolution: Never make adjustments by feel. Always follow the process in the appropriate service manual.

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.

Revised. Issue: Steering head bearings on 2014 and later Touring, CVO Touring and Police Touring motorcycles which may not have been adjusted correctly using the service manual procedure at dealerships. Resolution: NOTE - Never make adjustments by feel. Always follow the process in the appropriate service manual. When submitting warranty claim information for steer head bearing adjustment, Harley-Davidson requires the following data: 1) What was the original steering head bearing swing back result found on the vehicle? (see service manual), 2) What was the swing back result after the steering head bearing adjustment was performed? (see service manual).

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.

2014 and later Touring and CVO Touring motorcycles which may not have been adjusted correctly using the service manual procedure at dealerships. During recent dealer visits to observe steering head bearing adjustment process, Harley-Davidson staff observed that some dealers are not correctly following the service manual steering head bearing adjustment process. Harley-Davidson motorcycles are designed, manufactured and tested to be operated with both of the rider?s hands on the handlebar. If you or a customer are experiencing a handling concern, refer to the TROUBLESHOOTING, HANDLING, IRREGULARITIES found in the MAINTAINANCE chapter of the appropriate service manual.

PURPORSE: Revision T. 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 T] Updated: New Software Update, Previous Software Updates and DCA-8000. Added: 192-210335P. Software update 192-210335P for GRX-3110 and DCA-800 to add new battery part numbers.

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.

PURPOSE: 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 24.8.8. Release Date: Week of August 5, 2024. New Features for Harley-Davidson vehicles: Advanced Module Replace for 2021 and later Revolution Max; 2023 and later CVO Touring; and 2024 Street Glide (FLHX), Road Glide (FLTRX). New Features for LiveWire vehicles: Updated calibrations for 2024 S2DM EV1/ EV6; 2024 S2MH EV1; and 2024 S2DM, S2MH. Changes: Added Hand Control Module (HCM) (Part No. 71500522A and 71500536A) for reflash support.

Issue: Some CB (Citizens band) radio equipped Touring model customers have expressed concern about manipulating the PTT (Push to talk) button on the right hand control, while operating the throttle control. Symptom: Rider's comfort. Resolution: To address this concern, a new feature is included in DIGITAL TECHNICIAN II (PART NUMBER: HD-48650) software version 11.0 that allows the configuration of the PTT and cruise control buttons to be interchanged. This will allow CB radio customers the option to move PTT function to the LHCM (Left hand control module) and the cruise control function to the RHCM (Right hand control module). If a customer requests this change in configuration, the kit in Table 1 must be installed. These buttons are gray to visually differentiate them from the OE (Original equipment) buttons.

Purpose is to notify dealers that the Smart Tune PRO ? Automatic Tuning Module is 50-state U.S. EPA approved and released for shipment.

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.

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

Purpose: 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. Note: Resubmission is a correction to Selected Products Section of Transaction ID 24MC44619, NHTSA ID 10248397. Models Affected by M1612 to include only: 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

Purpose: 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.

During service intervals, customers or dealers may find oil level in the primary above the clutch cover opening. This also is accompanied by low transmission oil level. 2014 - 2016 Vehicles:For Twin-Cam models, replace the oil seal (Part No. 12068) and sprocket shaft spacer (Part No. 24009-06). 2017 and Later Vehicles: Check the primary and transmission oil levels and adjust the oil volumes as needed. Verify oil levels again in 1,600 km (1,000 mi).

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

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.

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.

BOX AUDIO INFOTAINMENT SYSTEMS. IT ALSO LISTS SOFTWARE REVISIONS AND THE FIXES ADDRESSED IN EACH REVISION.

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.

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.

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.

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.

PURPOSE: Revision. Some 2009 - 2020 Touring, Touring CVO, Touring Police models exhibit drainage of rusty water from the rear fork (where the debris deflector mounts), which has raised customer concern. Updated Model Years. NOTE: This is a cosmetic concern and not an indication of an internal issue.

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.

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.

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.

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 24.6.4. Release Date: Week of May 1, 2024. New Features for LiveWire S2DM and S2MH, 2024 Revolution Max, and 2024 Touring.

Revision: Added Dealer inventory instructions. Purpose for Service Bulletin: To inform dealers of a new coolant pump replacement kit for 2014 - 2016 Twin Cooled vehicles. Markets Affected: All markets are affected.

do not meet the inspection criteria described under "Required Dealer Action" no longer need to be returned. Kit 91500084 that do not meet the inspection criteria can be destroyed and discarded. Previous revision information: No action is required on vehicles previously repaired with the 91500084 kit.