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Service bulletin M1490

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11034747
Published by NHTSA2026-07-07
Manufacturer's numberM1490
Manufacturer's date2026-06-11
NHTSA componentFUEL/PROPULSION SYSTEM; ELECTRICAL SYSTEM; POWER TRAIN

NHTSA's summary

SERVICE BULLETIN M1490 (V 26.7.3): 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 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.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Fuel system, Transmission and driveline

Vehicles listed
LIVEWIRE LIVEWIRE2020
LIVEWIRE LIVEWIRE ONE2021, 2022, 2023, 2024
LIVEWIRE S2 ALPINISTA2025, 2026
LIVEWIRE S2 DEL MAR2023, 2024, 2025, 2026
LIVEWIRE S2 MULHOLLAND2024 to 2026
LIVEWIRE S4 HONCHO STREET2027

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
24V6010002024-08-12. ELECTRICAL SYSTEM:PROPULSION SYSTEM:FUSES, RELAYS, CONTACTS, AND SHUNTS
24V1490002024-02-26. ELECTRICAL SYSTEM:SOFTWARE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
M14902026-10-02. Service bulletin. SERVICE BULLETIN M1490 (V 26.9.4): 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. 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.
M14902026-08-06. Service bulletin. 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).
M14902026-05-08. Service bulletin. SERVICE BULLETIN M1490 (V 26.6.2): 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). 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.
M14902026-04-08. Service bulletin. SERVICE BULLETIN M1490 (V 26.5.2): 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). 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).
L10262026-04-08. Service bulletin. SERVICE BULLETIN L1026: TECH TIP 002 - S2 12 VOLT BATTERY BEST PRACTICES. PURPOSE: Initial Release. This bulletin informs dealers of best practices for diagnosing a LiveWire S2 vehicle that presents a depleted or fully-discharged 12 V battery and making sure contributing issues are identified. Use this bulletin’s troubleshooting guidance to help identify contributing issues affecting 12 V battery health. A depleted or fully discharged 12v battery may be the result of other systems or components affecting 12 V battery health. Or it may be the result of expected behavior relating to certain conditions the 12 V battery was exposed.
L10252026-03-05. Service campaign. SERVICE BULLETIN L1025: PRODUCT PROGRAM 1902 S2 ABS/EHCU MODULE CORRECTION. PURPOSE: Initial Release. This bulletin informs dealers that the Anti-lock Braking System / Electro -Hydraulic Control Unit (ABS EHCU) module on some S2 Del Mar and Mulholland vehicles have a software configuration that prevents them from being unlocked. This prevents the ability to perform an ABS service bleed and software updates. It does not affect the operation of Anti-lock Braking System (ABS). The update is applied by Digital Technician II (DT II) and will apply a seed and key to the Electro Hydraulic Control Unit (EHCU), which enables it to be unlocked via DT II or Firmware Over The Air (FOTA) update. The affected vehicles will also require an EHCU reflash following the update.
L1024_Customer Letter2026-02-06. Service bulletin. SERVICE BULLETIN L1024: LIVEWIRE ONE (LW1) INSTRUMENT MODULE REPLACEMENT (CUSTOMER LETTER). Intial Release. This bulletin informs vehicle owners that the Original Equipment (OE) Instrument Module (Part No. 70901100) has been discontinued and is no longer available to order as a replacement component for the 2021-2023 LiveWire ONE (LW1). If the Instrument Module (IM) needs to be replaced, one of the following replacement kits will be available: • Part No. 76001482 (EV 1-DOM) • Part No. 76001483 (EV 3-HDI). This kit will replace the original instrument with a 4-inch round instrument along with the supporting parts. Due to the differences in the instrument modules, appearance and functional content in this bulletin MUST be given to the vehicle owner. The attached items in this bulletin are: • Owner's Manual (OM) content to explain the operation of the new instrument module • Electrical Diagnostic Manual (EDM) content with an updated wire schematic and diagnostic procedure • Service Manual content to remove and install the round instrument module.
L10242026-02-06. Service bulletin. SERVICE BULLETIN L1024: LIVEWIRE ONE (LW1) INSTRUMENT MODULE REPLACEMENT. Initial Release. This bulletin informs dealers that the Original Equipment (OE) Instrument Module (Part No. 70901100) has been discontinued and is no longer available to order as a replacement componentfor the 2021-2023 LiveWire ONE (LW1). See Figure 1. If the Instrument Module (IM) needs to be replaced, use one of the following replacement kits: • Part No. 76001482 (EV 1-DOM) • Part No. 76001483 (EV 3-HDI). This kit will replace the original instrument with a 4-inch round instrument along with the supporting parts. Instruction sheet 94100595 outlines the process of installing the kit. Due to the differences in the instrument modules, appearance and functional content in this bulletin MUST be given to the vehicle owner. The attached items in this bulletin are: • Owner's Manual (OM) content to explain the operation of the new instrument module • Electrical Diagnostic Manual (EDM) content with an updated wire schematic and diagnostic procedure • Service Manual content to remove and install the round instrument module.
M17042026-01-09. Service bulletin. SERVICE BULLETIN M1704: HARLEY-DAVIDSON LIVEWIRE INSTRUMENT MODULE REPLACEMENT. PURPOSE: Initial Release. This bulletin informs dealers that the Original Equipment (OE) Instrument Module (Part No. 70900801) has been discontinued and is no longer available to order as a replacement component for the 2020 Harley-Davidson LiveWire (ELW).
M1704_Customer Letter2026-01-09. Service bulletin. SERVICE BULLETIN M1704: HARLEY-DAVIDSON LIVEWIRE INSTRUMENT MODULE REPLACEMENT (CUSTOMER LETTER). PURPOSE: UPDATED PUBLICATIONS. NOTE The following manuals have been updated. Completed publications can be viewed electronically on Service Information Portal (SIP). ALWAYS verify you are using the most current version.