2026 Harley-Davidson Flhlt TSBs

PURPOSE: Initial Release. This bulletin informs dealers that select Liberty Edition Road Glide (FLTRX) and Street Glide 3 Limited (FLHLT) motorcycles built between May 21, 2026 and June 10, 2026 will be shipped with an Incorrect Derby Cover (Part No. 25701561) installed. See Figure 1. This is the result of a temporary part shortage impacting the correct Liberty Edition component. Dealers will be required to replace the incorrect Derby Cover (Part No. 25701561) and associated components with the correct Derby Cover (Part No. 25702025) and associated components once they arrive at the dealership. Harley-Davidson will be sending the replacement parts directly to dealers with impacted units starting mid-June.

PURPOSE: Initial release. This bulletin informs dealers that the Trike Saddlebags kit (Part No. 84031-11) has an informational update: The drill template that is inside the kit, is only used for 2009-2025 Trike models. The electronic version of this instruction sheet which is located in Service Information Portal (SIP), will have the drill template as an attachment for 2026 and later Trike models (see service bulletin M1714). It will not be included inside the kit or directly attached to the instruction sheet.

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.

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.

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 26.3.2. Release Date: Week of January 28, 2026. NOTE Software version (26.3.2) will need to be manually installed only if current software version of DT II is (26.0.2). Refer to bulletin M1713 for instructions. New Features: LiveWire. Changes: Revolution Max and all MY2026 vehicles. 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). Version 26.7.3. Release Date: Week of June 11, 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.

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 26.6.2. Release Date: Week of April 22, 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: 2026 Police Vehicle Setup: Civilianize; LiveWire S2: Del Mar (S2DM), Mulholland (S2MH), Alpinista (S2AP) - Calibration bundle 10.2.20: Vehicle Supervisory Controller (VSC) and Onboard Charger (OBC) reflash updates. Changes: 2026 Trike Update Reverse Lockout Reason resize column.

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).

PURPOSE: Revision B. 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 (26.3.2) 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 (26.2.1) has previously been completed, DT II will automatically update to (26.3.2) and no additional action is needed. Revision B. 1/28/2026. Updated: Purpose for Service Bulletin and Required Dealer Action. Updated to Software Version (26.3.2). Revision A. 1/16/2026. Updated: Purpose for Service Bulletin and Required Dealer Action. Updated to Software Version (26.2.1).

PURPOSE: Revision. This bulletin provides a belt dressing procedure to reduce a high frequency sound originating in the belt tensioner pulley area. Revision B: Updated: Purpose for Service Bulletin and Required Dealer Action. Verbiage updated and add Note.

PURPOSE: Revision. This bulletin provides a belt dressing procedure to address a high frequency sound originating in the belt tensioner pulley area. Revision A: Updated: Purpose for Service Bulletin and Required Dealer Action. Verbiage updated and add Note.

PURPOSE: Revision. This bulletin informs dealers that Harley-Davidson has lifted the hold for the Screamin' Eagle Pro Street Tuner and software for certain 2026 vehicles. Updated: Purpose for Parts and Accessories Bulletin and Summary. Updated: Purpose for Parts and Accessories Bulletin and Summary, Update software availability.

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).

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 26.5.2 Release Date: Week of March 30, 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. 2024: Pan America (RA1250), Pan America Special (RA1250S), CVO Pan America (RA1250SE) Updated Body Control Module (BCM) reflash calibration. 2024-2026: CVO Road Glide ST (FLTRXSTSE) Updated Electronic Control Module (ECM) reflash calibration. 2026: CVO Street Glide ST (FLHXSTSE) Updated ECM reflash calibration. Changes. 2026 Trike Update Reverse Lockout Reason to support new values, Vehicle setup: Gear Indicator Calibration improve operation. 2025-2026 Softail Update reflash for Softail Speedometer (SPDO) enable operation of auxiliary lamp telltale. LiveWire S2 Provide reflash support for Vehicle Supervisory Controller (VSC) hardware (Part No. 41001756RE).

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 26.4.3 Release Date: Week of February 25, 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). Refer to bulletin M1713 for instructions. New Features: Support for 2026 LiveWire Vehicles, LiveWire S2 Vehicle Status: Display notification when vehicle has unconfigured Electro Hydraulic Control Unit (EHCU) module, Vehicle Setup: New operation to support Anti-lock Braking System (ABS) / EHCU Correction, Reflash: Enabled EHCU calibrations for vehicles previously ineligible for update, requiring ABS / EHCU Correction to be performed. 20212025 Pan America (RA1250), Pan America S (RA1250S), Pan America ST (RA1250ST), CVO Pan America (RA1250SE): Reflash Updated Electronic Control Module (ECM) software calibration to improve quick shifter performance. Changes: Infotainment Control Unit (IFCU) Customization Correct issue where speakers were improperly configured.

PURPOSE: Initial Release. This bulletin provides a belt dressing procedure to address a high frequency sound originating in the belt tensioner pulley area.

PURPOSE: Initial release. This bulletin informs dealers that there is a replacement Seat (Part No. 52000913) and Passenger Backrest (Part No. 52300750) available to replace the Liberty Edition Enthusiast seats exhibiting loose fabric and other warrantable concerns.

PURPOSE: Initial Release. This bulletin informs dealers of new essential tools necessary to perform all procedures on 2026 and later Trike models. New tools will be delivered in the 1st quarter of 2026. In an effort to keep essential tool costs low, Harley-Davidson actively tries to re-use existing tools that should already be in dealer inventory from past models. HD-49303 is an active tool that dealers should have for use on 2009-2025 trike models. 2026 and later Trikes use HD-49303 in conjunction with a new tool HD-53462. Check your essential tools inventory and order HD-49303 if it is missing. See Figure 1.

PURPOSE: Revision. NOTE: Service Bulletin M1715 supersedes M1666. Repairs made to vehicles after April 8, 2026 following M1666 will not be accepted through warranty. Warranty claims on repairs made prior to April 8, 2026 will be accepted following standard claim submission policy and process. This bulletin informs dealers of a Skyline OS software update, version (260005057D), for 2023-2026 Touring and 2026 Trike vehicles equipped with an Infotainment Control Unit (IFCU). This software update will be available both as Over The Air (OTA) and Universal Serial Bus (USB). Revision C. Updated: Required Dealer Action. Updated: Pre-delivery Update Note Added.

PURPOSE: Revision. Updated: Purpose for Service Bulletin. Date Change: April 8 was April 24. Note added. NOTE: Service Bulletin M1715 supersedes M1666. Repairs made to vehicles after April 8, 2026 following M1666 will not be accepted through warranty. Warranty claims on repairs made prior to April 8, 2026 will be accepted following standard claim submission policy and process. This bulletin informs dealers of a Skyline OS software update, version (260005057D), for 2023-2026 Touring and 2026 Trike vehicles equipped with an Infotainment Control Unit (IFCU). This software update will be available both as Over The Air (OTA) and Universal Serial Bus (USB).

PURPOSE: Initial release 3/9/2026. Revision A. 3/24/2026. Updated: Purpose for Service Bulletin. Added supersession note regarding M1666. Purpose for Service Bulletin. NOTE Service Bulletin M1715 supersedes M1666. Repairs made to vehicles after April 24, 2026 following M1666 will not be accepted through warranty. Warranty claims on repairs made prior to April 24, 2026 will be accepted following standard claim submission policy and process. This bulletin informs dealers of a Skyline OS software update, version (260005057D), for 2023-2026 Touring and 2026 Trike vehicles equipped with an Infotainment Control Unit (IFCU). This software update will be available both as Over The Air (OTA) and Universal Serial Bus (USB).

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. NOTE: The TECHLINK 3 (PART NUMBER: HD-48650-TL3) supports Controller Area Network (CAN) and J-1850 protocol vehicles. 6-pin CAN vehicles are recommended to use Techlink 3 (TL-3) All 2021 (and later) vehicles must use TL-3 (connects to Red DLC on the vehicle) 4-pin (J-1850) vehicles are recommended to use TL-3. This includes all Fuel Injected Harley-Davidson vehicles 2002 and later. TECHLINK 3 (PART NUMBER: HD-48650-TL3) will not support Buell, VDO and Magneti Marelli vehicles (4-pin DLC). Support for those vehicles is available via TECHLINK II (PART NUMBER: HD-48650-1). Version 26.9.4, Release Date: Week of September 17, 2026. New Features, Changes. 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.

PURPOSE: Initial Release. This bulletin informs dealers and technicians that there are Parts and Accessories (P&A) Wiring Schematics for Harley-Davidson Audio Powered by Rockford Fosgate components. Schematics are available for both Non Center-Cooled and Center-Cooled models.