# Service bulletin M1391A 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. - Type: Service bulletin - NHTSA id: 11025167 - Published by NHTSA: 2025\-11\-07 - Manufacturer's number: M1391A - Manufacturer's date: 2025\-10\-28 - NHTSA component: ELECTRICAL SYSTEM; UNKNOWN OR OTHER ## NHTSA's 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. ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025167-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11025167-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Electrical system ## Vehicles listed - 2010 BUELL XB12R - 2010 BUELL XB12SCG - 2010 BUELL XB12SS - 2010 BUELL XB12X - 2010 BUELL XB12XP - 2010 BUELL XB12XT - 2010 BUELL XB9SX - 2012 HARLEY\-DAVIDSON FLD - 2014 to 2016 HARLEY\-DAVIDSON FLD - 2017 to 2020 HARLEY\-DAVIDSON FLDE - 2018 to 2019 HARLEY\-DAVIDSON FLFB - 2025 HARLEY\-DAVIDSON FLFB - 2018 to 2024 HARLEY\-DAVIDSON FLFBS - 2018 HARLEY\-DAVIDSON FLFBS ANV - 2018 HARLEY\-DAVIDSON FLFBS ANX - 2020 HARLEY\-DAVIDSON FLFBSANV - 2023 HARLEY\-DAVIDSON FLFBSANV - 2021 HARLEY\-DAVIDSON FLH - 2017 to 2021 HARLEY\-DAVIDSON FLHC - 2025 HARLEY\-DAVIDSON FLHC - 2018 to 2024 HARLEY\-DAVIDSON FLHCS - 2018 to 2023 HARLEY\-DAVIDSON FLHCS ANV - 2023 HARLEY\-DAVIDSON FLHFB - 2010 to 2025 HARLEY\-DAVIDSON FLHP - 2010 to 2011 HARLEY\-DAVIDSON FLHPE - 2010 to 2022 HARLEY\-DAVIDSON FLHR - 2011 HARLEY\-DAVIDSON FLHR103 - 2013 HARLEY\-DAVIDSON FLHR103 - 2010 to 2011 HARLEY\-DAVIDSON FLHRC - 2013 to 2016 HARLEY\-DAVIDSON FLHRC - 2011 to 2012 HARLEY\-DAVIDSON FLHRC103 - 2013 to 2014 HARLEY\-DAVIDSON FLHRSE - 2011 HARLEY\-DAVIDSON FLHRUSE - 2011 HARLEY\-DAVIDSON FLHRX103 - 2017 to 2025 HARLEY\-DAVIDSON FLHRXS - 2010 HARLEY\-DAVIDSON FLHT - 2019 to 2022 HARLEY\-DAVIDSON FLHT - 2010 to 2013 HARLEY\-DAVIDSON FLHTC - 2011 to 2012 HARLEY\-DAVIDSON FLHTC103 - 2010 to 2011 HARLEY\-DAVIDSON FLHTCU - 2013 to 2019 HARLEY\-DAVIDSON FLHTCU - 2014 to 2015 HARLEY\-DAVIDSON FLHTCU TC - 2011 to 2014 HARLEY\-DAVIDSON FLHTCU103 - 2015 to 2017 HARLEY\-DAVIDSON FLHTCUL - 2015 HARLEY\-DAVIDSON FLHTCUL TC - 2010 HARLEY\-DAVIDSON FLHTCUSE5 - 2011 HARLEY\-DAVIDSON FLHTCUSE6 - 2012 HARLEY\-DAVIDSON FLHTCUSE7 - 2013 HARLEY\-DAVIDSON FLHTCUSE8 - 2017 HARLEY\-DAVIDSON FLHTCUTC - 2010 to 2025 HARLEY\-DAVIDSON FLHTCUTG - 2018 HARLEY\-DAVIDSON FLHTCUTG ANV - 2023 HARLEY\-DAVIDSON FLHTCUTGANV - 2019 to 2022 HARLEY\-DAVIDSON FLHTCUTGSE - 2010 to 2024 HARLEY\-DAVIDSON FLHTK - 2018 HARLEY\-DAVIDSON FLHTK ANV - 2020 to 2023 HARLEY\-DAVIDSON FLHTK SHRINE - 2023 HARLEY\-DAVIDSON FLHTKANV - 2015 to 2019 HARLEY\-DAVIDSON FLHTKL - 2014 to 2021 HARLEY\-DAVIDSON FLHTKSE - 2018 HARLEY\-DAVIDSON FLHTKSE ANV - 2010 to 2025 HARLEY\-DAVIDSON FLHTP - 2010 to 2025 HARLEY\-DAVIDSON FLHX - 2018 HARLEY\-DAVIDSON FLHX ANV - 2018 HARLEY\-DAVIDSON FLHX ANX - 2011 to 2014 HARLEY\-DAVIDSON FLHX103 - 2014 to 2023 HARLEY\-DAVIDSON FLHXS - 2023 HARLEY\-DAVIDSON FLHXSANV - 2010 HARLEY\-DAVIDSON FLHXSE - 2015 to 2025 HARLEY\-DAVIDSON FLHXSE - 2011 HARLEY\-DAVIDSON FLHXSE2 - 2012 HARLEY\-DAVIDSON FLHXSE3 - 2022 to 2023 HARLEY\-DAVIDSON FLHXST - 2025 HARLEY\-DAVIDSON FLHXU - 2010 to 2012 HARLEY\-DAVIDSON FLHXXX - 2024 HARLEY\-DAVIDSON FLI - 2015 to 2025 HARLEY\-DAVIDSON FLRT - 2013 HARLEY\-DAVIDSON FLS - 2017 HARLEY\-DAVIDSON FLS - 2015 to 2016 HARLEY\-DAVIDSON FLS103 - 2018 to 2022 HARLEY\-DAVIDSON FLSB - 2024 HARLEY\-DAVIDSON FLSB - 2018 to 2021 HARLEY\-DAVIDSON FLSL - 2016 to 2017 HARLEY\-DAVIDSON FLSS - 2010 to 2017 HARLEY\-DAVIDSON FLSTC - 2010 to 2011 HARLEY\-DAVIDSON FLSTF - 2016 to 2017 HARLEY\-DAVIDSON FLSTF - 2015 HARLEY\-DAVIDSON FLSTF103 - 2010 to 2017 HARLEY\-DAVIDSON FLSTFB - 2016 to 2017 HARLEY\-DAVIDSON FLSTFBS - 2025 HARLEY\-DAVIDSON FLSTFI - 2010 to 2017 HARLEY\-DAVIDSON FLSTN - 2014 to 2015 HARLEY\-DAVIDSON FLSTNSE - 2010 to 2011 HARLEY\-DAVIDSON FLSTSB - 2010 HARLEY\-DAVIDSON FLSTSE - 2011 HARLEY\-DAVIDSON FLSTSE2 - 2012 HARLEY\-DAVIDSON FLSTSE3 - 2020 to 2024 HARLEY\-DAVIDSON FLTRK - 2022 HARLEY\-DAVIDSON FLTRKSE - 2023 HARLEY\-DAVIDSON FLTRKSE ANV - 2023 to 2025 HARLEY\-DAVIDSON FLTRT - 2010 to 2011 HARLEY\-DAVIDSON FLTRU - 2013 HARLEY\-DAVIDSON FLTRU - 2016 to 2019 HARLEY\-DAVIDSON FLTRU - 2011 to 2013 HARLEY\-DAVIDSON FLTRU103 - 2011 HARLEY\-DAVIDSON FLTRUSE - 2015 to 2016 HARLEY\-DAVIDSON FLTRUSE - 2010 to 2011 HARLEY\-DAVIDSON FLTRX - 2013 HARLEY\-DAVIDSON FLTRX - 2015 to 2025 HARLEY\-DAVIDSON FLTRX - 2011 to 2013 HARLEY\-DAVIDSON FLTRX103 - 2024 to 2025 HARLEY\-DAVIDSON FLTRXP - 2025 HARLEY\-DAVIDSON FLTRXRRSE - 2015 to 2023 HARLEY\-DAVIDSON FLTRXS - 2023 HARLEY\-DAVIDSON FLTRXSANV - 2012 HARLEY\-DAVIDSON FLTRXSE - 2018 to 2025 HARLEY\-DAVIDSON FLTRXSE - 2013 HARLEY\-DAVIDSON FLTRXSE2 - 2022 to 2023 HARLEY\-DAVIDSON FLTRXST - 2023 to 2025 HARLEY\-DAVIDSON FLTRXSTSE - 2018 to 2020 HARLEY\-DAVIDSON FXBB - 2025 HARLEY\-DAVIDSON FXBB - 2021 to 2024 HARLEY\-DAVIDSON FXBBS - 2018 to 2019 HARLEY\-DAVIDSON FXBR - 2023 to 2025 HARLEY\-DAVIDSON FXBR - 2018 to 2020 HARLEY\-DAVIDSON FXBRS - 2022 to 2023 HARLEY\-DAVIDSON FXBRS - 2018 HARLEY\-DAVIDSON FXBRS ANX - 2010 to 2011 HARLEY\-DAVIDSON FXCWC - 2010 HARLEY\-DAVIDSON FXD - 2010 to 2018 HARLEY\-DAVIDSON FXDB - 2016 HARLEY\-DAVIDSON FXDBC 103 - 2013 HARLEY\-DAVIDSON FXDBP - 2016 to 2017 HARLEY\-DAVIDSON FXDBP 103 - 2010 to 2014 HARLEY\-DAVIDSON FXDC - 2010 to 2017 HARLEY\-DAVIDSON FXDF - 2010 HARLEY\-DAVIDSON FXDFSE2 - 2010 to 2017 HARLEY\-DAVIDSON FXDL - 2016 to 2017 HARLEY\-DAVIDSON FXDLS - 2019 to 2020 HARLEY\-DAVIDSON FXDRS - 2010 to 2014 HARLEY\-DAVIDSON FXDWG - 2016 to 2017 HARLEY\-DAVIDSON FXDWG - 2018 to 2019 HARLEY\-DAVIDSON FXFB - 2018 to 2024 HARLEY\-DAVIDSON FXFBS - 2018 to 2020 HARLEY\-DAVIDSON FXLR - 2020 to 2025 HARLEY\-DAVIDSON FXLRS - 2022 to 2025 HARLEY\-DAVIDSON FXLRST - 2022 HARLEY\-DAVIDSON FXRST - 2011 to 2012 HARLEY\-DAVIDSON FXS - 2013 to 2018 HARLEY\-DAVIDSON FXSB - 2013 to 2014 HARLEY\-DAVIDSON FXSBSE - 2016 to 2017 HARLEY\-DAVIDSON FXSE - 2010 to 2011 HARLEY\-DAVIDSON FXST - 2020 to 2024 HARLEY\-DAVIDSON FXST - 2010 HARLEY\-DAVIDSON FXSTC - 2010 HARLEY\-DAVIDSON VRSCAW - 2010 to 2017 HARLEY\-DAVIDSON VRSCDX - 2010 to 2017 HARLEY\-DAVIDSON VRSCF - 2015 to 2020 HARLEY\-DAVIDSON XG500 - 2015 to 2020 HARLEY\-DAVIDSON XG750 - 2017 to 2020 HARLEY\-DAVIDSON XG750A - 2010 HARLEY\-DAVIDSON XL1200C - 2014 to 2020 HARLEY\-DAVIDSON XL1200C - 2011 HARLEY\-DAVIDSON XL1200CP - 2016 to 2021 HARLEY\-DAVIDSON XL1200CX - 2010 to 2011 HARLEY\-DAVIDSON XL1200L - 2010 to 2011 HARLEY\-DAVIDSON XL1200N - 2018 to 2021 HARLEY\-DAVIDSON XL1200NS - 2014 to 2017 HARLEY\-DAVIDSON XL1200T - 2020 HARLEY\-DAVIDSON XL1200T - 2012 HARLEY\-DAVIDSON XL1200V - 2014 to 2016 HARLEY\-DAVIDSON XL1200V - 2010 to 2012 HARLEY\-DAVIDSON XL1200X - 2014 to 2021 HARLEY\-DAVIDSON XL1200X - 2018 HARLEY\-DAVIDSON XL1200X ANX - 2018 to 2020 HARLEY\-DAVIDSON XL1200XS - 2010 HARLEY\-DAVIDSON XL883C - 2010 to 2021 HARLEY\-DAVIDSON XL883L - 2010 to 2012 HARLEY\-DAVIDSON XL883N - 2014 to 2021 HARLEY\-DAVIDSON XL883N - 2010 to 2011 HARLEY\-DAVIDSON XL883R - 2010 HARLEY\-DAVIDSON XR1200 - 2010 to 2012 HARLEY\-DAVIDSON XR1200X JSON: [/v1/bulletins/11025167](/v1/bulletins/11025167) [Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20M1391A&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11025167&vehicle=Service%20bulletin%20M1391A)