Vehicle report
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.
M1733
SERVICE BULLETIN M1733: COSMETIC CYLINDER STAINING (ALL MILWAUKEE-EIGHT MODELS). PURPOSE: Initial release. This bulletin informs dealers that cosmetic staining or etching on the inside of the cylinder bore does not have an impact on engine performance, oil consumption, or overall functionality. This bulletin provides example images of cylinders with cosmetic staining, and images of cases where cylinder replacement would be recommended.
M1490
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).
M1679
SERVICE BULLETIN M1679: AFTERMARKET EXHAUST HEADER DEBRIS. 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.
M1713
SERVICE BULLETIN M1713 (REV C): DTII UPDATE PROCEDURE FOR SOFTWARE VERSION (26.4.3). 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).
W146
WARRANTY BULLETIN W146 (REV C): TIRE TREAD DEPTH GUIDE-UPDATE. PURPOSE: [Revision C. Updated: Tire Tread Depth Guide. Add tire part numbers 43100063, 43200035,43100029A, 43100033A and 43200045A.] To provide tire tread depth specifications for the dealership network to consult when filling warranty claims on used tires. Please see the Warranty Manual of your region for tire policy guidelines.
M1391A
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
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 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.
M1611
SERVICE BULLETIN M1611 (REV B): MILWAUKEE-EIGHT TRANSMISSION SHIFT DRUM UPDATE. PURPOSE: Revision. This bulletin informs dealers that (Part No. 33900172) is obsolete. Dealers must purchase the updated bearing door when installing the new shift drum on 2017-2024 Milwaukee-Eight vehicles. Revision B. Updated: Required Dealer Action. Updated sentence for M8 Transmission built before Oct 4, 2023.
M1555
SERVICE BULLETIN M1555 (REV H): BATTERY WARRANTY GUIDELINES. PURPOSE: This bulletin informs the dealership network that Harley-Davidson has provided guidelines for battery warranty. REV H. Update section headers: AGM and Lithium-Iron Phosphate Batteries. Add graphics and callouts. Updated: Information on Battery.
PAB1165
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1165 (REV A): H-D SYN3 SAE 15W50 / SAE 50 AVAILABILITY. PURPOSE: Revision (A) * Updated: Summary, Update table. This bulletin informs of the availability of the SYN3 New Improved Formula, a dual weight SAE 15W50 / SAE 50 Motorcycle Oil. The new formula transitions into inventory as the old SYN3 20W50 product inventory is depleted. Availability varies by SKU and region. The original SYN3 20W50 will be obsoleted when the transition is complete.
M1650
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).
PAB1162
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1162: PRO STREET TUNER-VIN AND CALIBRATION SEARCH. PURPOSE: To inform dealerships of a new Vehicle Identification Number (VIN) and Calibration search function for the Screamin' Eagle Pro Street Tuner (Bluetooth).
PAB1158
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 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
PAB1144
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1144: 2021-2022 SCREAMIN' EAGLE STAGE I (CARB) EO APPROVALS. PURPOSE: Revision. To inform California dealers about the new California Air Resources Board (CARB) approvals for select 2021-2022 Harley-Davidson vehicles. Summary: Various Screamin' Eagle Air Cleaner Kits and Stage I calibrations have been approved for sale on select 2021 and 2022 Harley-Davidson models. Please see the table below that indicates which part numbers should be ordered for what models. Revision: Refer to Summary. Update non-Bluetooth calibrations availability.
PAB1143
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1143: SCREAMIN EAGLE CARB APPROVALS. PURPOSE: To inform California dealers about the new California Air Resources Board (CARB) approvals. Screamin' Eagle Quickshifter and Screamin' Eagle Extreme Flow 55mm Intake Manifold.
PAB1142
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1142 (REV A): SCREAMIN EAGLE X OHLINS SPECIALTY TOOLS FOR SOFTAIL FORK KIT(S). PURPOSE: To inform dealerships about the Ãhlins® specialty tools that are required for the installation of the Front Fork Kit(s) on 2018-later Softail models.
M1600
SERVICE BULLETIN M1600: 2023 MILWAUKEE EIGHT OIL PAN FASTENER CHANGE. PURPOSE: This bulletin informs dealers that there is a running change for the oil pan fastener on all Milwaukee-Eight powered Softail and Touring models. As of Monday July 31, 2023, Powertrain Operations (PTO) in Menomonee Falls, WI is building all Milwaukee-Eight Softail and Touring powertrain models with new oil pan fasteners (Part No. 12600369). The old fasteners (Part No. 4741A) will still remain available for dealer purchase. The oil pans for the Softail and Touring models were updated to accept the new fastener geometry. Their Part Numbers have been superseded to (-A). Touring will be (Part No. 24400180A) and Softail will be (Part No. 24400208A). The new fastener will not fit with an old oil pan but the old hardware will still be available for dealer purchase. The old fastener CAN be used with a new (-A) oil pans. The fastener torque has not been changed.
PAB1140
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1140: CALIFORNIA SCREAMINâ EAGLE PRO STREET TUNER. PURPOSE: To inform dealerships about the availability of the new Bluetooth Screaminâ Eagle Pro Street Tuner for California models. 2021-2022: Softail, Touring and Trike California models only.
M1586
SERVICE BULLETIN M1586: SCREAMIN' EAGLE OIL PUMP INCORRECTLY MACHINED. PURPOSE: This bulletin informs dealers that Harley-Davidson has found a quality issue with the Screamin' Eagle Oil Pump and how to check inventory for this condition. Markets Affected: Worldwide
M1507
SERVICE BULLETIN M1507: LOW/NO CHARGING DIAGNOSTICS. Revision. PURPOSE: To inform the dealers of updated and new symptom-based diagnostics for the low or no charging symptom. Motorcycles Affected: 2017-2023 Touring and Trike platform; 2018-2023 Softail platform. Required Dealer Action: Use the new diagnostics on all affected platforms. View current electronic version of the Electrical Diagnostic Manual (EDM) at https://serviceinfo.harley-davidson.com.
PAB1111
GENUINE MOTOR PARTS AND MOTOR ACCESSORIES BULLETIN PAB1111: 2021 VEHICLES - SCREAMIN' EAGLE UPDATES. PURPOSE: Revision. To notify dealers of Screamin' Eagle® Street Tuner 49-State (only) calibrations for 2021 vehicles are now available. Screamin' Eagle Smart Tune Pro Automatic Tuning Module is currently a no-fit for 2021 Softail, Touring, Custom Vehicle Operations (CVO) Touring, Police Touring or Trike models due to the 2021 Electronic Control Module (ECM) change. However, it will continue to work with 2021 Sportster models. The Screaminâ Eagle team is working on enabling this product to fit those Milwaukee-Eight® (MKE-8) equipped ECMs in the future.
M1535
SERVICE BULLETIN M1535: SERVICE MANUAL AND ISHEET HANDLEBAR INSTALLATION REQUIREMENTS UPDATE: MODULAR BRAKE LINE KITS. PURPOSE: This bulletin informs dealers that Harley-Davidson has identified incorrect information in the 2018-2021 Softail Service Manuals. These errors have been corrected and are visible on Service Information Portal (SIP).
M1542
SERVICE BULLETIN M1542: MY21 TRANSMISSION DIPSTICK CHANGE. PURPOSE: This service bulletin is to inform dealers of a change to the transmission dipstick. This covers all Milwaukee-Eight powertrain's built at the Pilgrim Road Power Train Operations (PTO) factory in Menomonee Falls, Wisconsin for model year 2021 and 2022.
M1520
SERVICE BULLETIN M1520: 2021 INITIAL CARE. PURPOSE: Revised. The purpose of this program is to monitor Harley-Davidson quality delivered to the customers. Harley-Davidson Technical Service is providing an initial care program for a number of 2021 vehicle components. Update: All Internal Combustion Engine (ICE) vehicles parts have been removed from the initial care program as of March 19, 2021. All Electric Vehicle (EV) parts will remain in the initial care program. Table 2, Initial Care Parts List. Duration of Program: January 4, 2021 through April 4, 2021.
TA0006
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.
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.