Check a VIN

October 28, 2025 Service bulletin

Midtronics GRX-3110 and DCA-8000 software. purporse

Harley-Davidson technical service bulletin M1391A for 2010-2011, 2013-2019 Harley-Davidson Flhtcu, 2010-2025 Harley-Davidson FLHX and 2010-2024 Harley-Davidson Flhtk and others.

Bulletin number
M1391A
Component
Unknown or other
Summary
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.

Vehicles covered

VIN decoder

See the problems and recalls for an exact car

Buying a used Harley-Davidson Flhtcu?

Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.

Check its history