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2009 HARLEY-DAVIDSON Flhx

Owner reports · Recalls · Investigations

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There is not enough comparable history to draw a useful model-year comparison.

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Counts vary with age, sales and reporting. They are not failure rates.

What owners reported most

All reported categories

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When problems were reported

Mileage at the reported incident

27 reports with mileage · 1 unknown

NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.

What to inspect

Issues worth paying extra attention to based on owner reports.

  • Electrical System. Review the 10 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Fuel/propulsion System. Review the 6 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Service Brakes. Review the 6 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

1 crash reports0 fire reports1 injury reports

Vehicle Speed Control complaints

6 reports
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20,926 miles · Aug 28, 2019
Vehicle Speed ControlCrashInjury

TL* THE CONTACT OWNS A 2009 HARLEY DAVIDSON STREET MOTORCYCLE. THE CONTACT CAME TO A STOP AT AN INTERSECTION, THE REAR WHEEL SPED OFF AND THE CONTACT WAS EJECTED FROM THE VEHICLE. THE CONTACT FLIPPED OFF THE MOTORCYCLE AND ONTO THE CONCRETE. THE MOTOR MALFUNCTIONED DUE TO A FAILED "FLY BY WIRE THROTTLE SYSTEM". THE CONTACT SUST…

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TL* THE CONTACT OWNS A 2009 HARLEY DAVIDSON STREET MOTORCYCLE. THE CONTACT CAME TO A STOP AT AN INTERSECTION, THE REAR WHEEL SPED OFF AND THE CONTACT WAS EJECTED FROM THE VEHICLE. THE CONTACT FLIPPED OFF THE MOTORCYCLE AND ONTO THE CONCRETE. THE MOTOR MALFUNCTIONED DUE TO A FAILED "FLY BY WIRE THROTTLE SYSTEM". THE CONTACT SUSTAINED 9 FRACTURED RIBS, FRACTURED COLLAR BONE, ROAD RASH AND THREE QUARTS OF BLOOD WAS EXTRACTED FROM THE CONTACTS LUNGS. MEDICAL ATTENTION WAS SOUGHT AND A POLICE REPORT WAS FILED. THE POLICE REPORT DEEMED THAT THE INCIDENT WAS A MALFUNCTION OF THE MOTORCYCLE. THE MOTORCYCLE WAS CLASSIFIED AS A SALVAGED TOTAL BY THE CONTACT'S INSURANCE. THE CONTACT CALLED LIVER MORE HARLEY DAVIDSON 7576 SOUTHFRONT RD, LIVERMORE, CA 94551 (925) 606-0100 WHERE THE DEALER OFFERED TO BUY THE MOTORCYCLE BACK. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 20,926. THE VIN WAS NOT AVAILABLE.

NHTSA ODI #11252070

23,569 miles · Sep 8, 2015
EngineVehicle Speed Control

TL* THE CONTACT OWNS A 2009 HARLEY-DAVIDSON STREET RIDE FLHX MOTORCYCLE. WHILE DRIVING 65 MPH, THE CHECK ENGINE WARNING LIGHT ILLUMINATED AND THE THROTTLE FAILED TO RESPOND. THE FAILURE RECURRED SEVERAL TIMES. THE MOTORCYCLE WAS TAKEN TO THE DEALER. THE TECHNICIAN DIAGNOSED THAT THE INTAKE MANIFOLD AND THE INDUCTION MODULE KIT N…

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TL* THE CONTACT OWNS A 2009 HARLEY-DAVIDSON STREET RIDE FLHX MOTORCYCLE. WHILE DRIVING 65 MPH, THE CHECK ENGINE WARNING LIGHT ILLUMINATED AND THE THROTTLE FAILED TO RESPOND. THE FAILURE RECURRED SEVERAL TIMES. THE MOTORCYCLE WAS TAKEN TO THE DEALER. THE TECHNICIAN DIAGNOSED THAT THE INTAKE MANIFOLD AND THE INDUCTION MODULE KIT NEEDED TO BE REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE VEHICLE WAS REPAIRED. THE FAILURE MILEAGE WAS 23,569. UPDATED 11/09/15*LJ *CN

NHTSA ODI #10762093

21,792 miles · Sep 14, 2014
Electrical SystemFuel/propulsion SystemVehicle Speed Control

WHILE STOPPED AT RED LIGHT, AS THE LIGHT TURNED GREEN, I PROCEEDED TO APPLY THROTTLE WITH NO RESPONSE. LET OUT CLUTCH AND ROLLED NO FASTER THEN 20 MPH WHILE CARS WERE BACKING UP BEHIND ME. AFTER ROLLING AT 20 MPH FOR APPROXIMATELY HUNDRED YARDS, I WAS ABLE TO PULL OVER IN A SAFE LOCATION WITH OUT BEING RUN OVER. *TR

NHTSA ODI #10633060

9,300 miles · Sep 17, 2013
Fuel/propulsion SystemVehicle Speed Control

ACCELERATING FROM A STOP UP TO SPEED WHEN LOST THROTTLE RESPONSE, ENGINE WOULD NOT GO ABOVE 1500-2000 RPM. WAS ABLE TO LIMP TO THE SIDE OF THE ROAD. I SHUT BIKE DOWN AND WAITED A MINUTE AND RESTARTED IT. IT STARTED UP AND RAN AS NORMAL. TALKED TO MY LOCAL DEALER AND MADE THEM AWARE OF THE PROBLEM. THEY SEEMED VERY FAMILIAR WITH…

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ACCELERATING FROM A STOP UP TO SPEED WHEN LOST THROTTLE RESPONSE, ENGINE WOULD NOT GO ABOVE 1500-2000 RPM. WAS ABLE TO LIMP TO THE SIDE OF THE ROAD. I SHUT BIKE DOWN AND WAITED A MINUTE AND RESTARTED IT. IT STARTED UP AND RAN AS NORMAL. TALKED TO MY LOCAL DEALER AND MADE THEM AWARE OF THE PROBLEM. THEY SEEMED VERY FAMILIAR WITH THIS ISSUE AND SAID TO BRING IT IN AND THEY WOULD GIVE ME A COST TO FIX. THIS SEEMS TO ME TO BE A SEVERE SAFETY ISSUE THAT SHOULD BE ON A MANUFACTURES RECALL. WHAT IF I WERE TRYING TO GET ON THE INTERSTATE AND LOST THE ABILITY TO MERGE . *TR

NHTSA ODI #10544039

7,550 miles · Oct 1, 2012
Electrical SystemFuel/propulsion SystemVehicle Speed Control

THE PROBLEM BEGAN AROUND APRIL OF 2012. WHEN I STARTED THE MOTORCYCLE, THERE WAS NO THROTTLE RESPONSE. THE MOTORCYCLE WILL IDLE AT 1000 RPM BUT THE THROTTLE WILL NOT WORK WHEN TWISTED TO ACCELERATE ENGINE. IT REMAINS AT IDLE. IT HAS HAPPENED SEVERAL TIMES AND I HAVE TO DISCONNECT THE BATTERY IN ORDER TO RESET THE ELECTRO…

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THE PROBLEM BEGAN AROUND APRIL OF 2012. WHEN I STARTED THE MOTORCYCLE, THERE WAS NO THROTTLE RESPONSE. THE MOTORCYCLE WILL IDLE AT 1000 RPM BUT THE THROTTLE WILL NOT WORK WHEN TWISTED TO ACCELERATE ENGINE. IT REMAINS AT IDLE. IT HAS HAPPENED SEVERAL TIMES AND I HAVE TO DISCONNECT THE BATTERY IN ORDER TO RESET THE ELECTRONIC THROTTLE. SOMETIMES IT WORKS, OTHER TIMES IT DOES NOT. IT ALSO HAPPENED VARIOUS TIMES WHEN MOTORCYCLE WAS IN MOTION AT SPEEDS OF 45 MPH ALMOST CAUSING ME TO GET STRUCK ON HIGHWAY FROM BEHIND BY ANOTHER VEHICLE. MOTORCYCLE HAS ALSO STOPPED WORKING WHILE RIDING CAUSING ME TO HAVE TO PUSH MOTORCYCLE HOME OR ATTEMPT TO REPAIR IT TO NO AVAIL. I BROUGHT MOTORCYCLE IN TO HARLEY DAVIDSON FOR REPAIR AT ADAMIC HARLEY DAVIDSON, JACKSONVILLE FLORIDA. THEY STATED THEY FIXED IT MOTORCYCLE BEGAN TO DO THE SAME THING AFTER APPROXIMATELY 75 MILES, NOW MOTORCYCLE WILL IDLE BUT THERE IN NO THROTTLE RESPONSE AT ALL. WORK ORDER NUMBER:661593, DATE OF SERVICE 7/25/12. UPON FURTHER INVESTIGATION I SEE THIS AFFECTS MANY 2009 HARLEY DAVIDSON MOTORCYCLES, SPECIFICALLY FLHX MODELS AND AT LEAST ONE FATAL ACCIDENT HAS OCCURRED BECAUSE OF IT. IT HAS BECOME A SAFETY ISSUE FOR ME AND I WANT OTHERS TO BE AWARE OF THE PROBLEM. I SEARCHED FURTHER ON THE INTERNET TO FIND A MEMORANDUM ISSUED BY HARLEY DAVIDSON TO SEE THAT THIS DOES EFFECT 2009 HARLEY DAVIDSON WITH THE ELECTRONIC THROTTLE, ALSO KNOWN AS THE FLY BY WIRE THROTTLE SYSTEM. THEY STATED THAT IT NORMALLY HAPPENS AROUND 8,000 MILES AND IT IS CAUSED BY CORROSION ON THE PINS OF THE MODULE THAT CONTROLS THE ELECTRONIC THROTTLE. HARLEY DAVIDSON'S REMEDY TO THIS PROBLEM IS TO CLEAN OR REPLACE THE PINS IN THE MODULE AND COAT WITH ELECTRO-GREASE. IF IT HAPPENS AGAIN REPEAT PROCESS. AT THIS TIME MY MOTORCYCLE WILL NOT RUN AND IS NOT USABLE. *TR

NHTSA ODI #10478161

15,200 miles · Jun 12, 2011
Electrical SystemVehicle Speed Control

I WAS RIDING HOME FROM MARIETTA, GEORGIA ON INTERSTATE 575 AND HAD THE CRUISE CONTROL ENGAGED. SUDDENLY AND UNEXPECTEDLY, THE CRUISE CONTROL KICKED OFF AND I BEGAN TO DECELERATE. I WAS POSITIVE THAT I HAD NOT HIT THE CLUTCH OR EITHER BRAKE, ANY OF WHICH WOULD HAVE DISENGAGED THE CRUISE CONTROL. WHEN I ATTEMPTED TO ACCELERATE,…

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I WAS RIDING HOME FROM MARIETTA, GEORGIA ON INTERSTATE 575 AND HAD THE CRUISE CONTROL ENGAGED. SUDDENLY AND UNEXPECTEDLY, THE CRUISE CONTROL KICKED OFF AND I BEGAN TO DECELERATE. I WAS POSITIVE THAT I HAD NOT HIT THE CLUTCH OR EITHER BRAKE, ANY OF WHICH WOULD HAVE DISENGAGED THE CRUISE CONTROL. WHEN I ATTEMPTED TO ACCELERATE, ONCE AGAIN, I FOUND THAT THE ENGINE HAD GONE TO A "ROUGH IDLE" AND THAT MY THROTTLE WAS UNRESPONSIVE. IN OTHER WORDS, THE ENGINE WOULD NOT ACCELERATE AT ALL. FORTUNATELY, I WAS IN THE OUTSIDE TRAFFIC LANE AND WAS ABLE TO PULL INTO THE EMERGENCY LANE WITHOUT ANY DIFFICULTY. I TURNED ON MY EMERGENCY FLASHERS, TURNED OFF THE ENGINE AND WAITED APPROXIMATELY ONE MINUTE. I THEN RE-STARTED THE ENGINE WITHOUT INCIDENT AND DROVE THE REMAINING DISTANCE HOME. MY BELIEF, AT THAT TIME, WAS THAT THE PROBLEM WAS CAUSED BY DIFFICULTY WITHIN EITHER THE COMPUTER CONTROL OR THE CRUISE CONTROL SYSTEM ITSELF. I CONTACTED MY DEALER, DROVE IT TO THEM THE FOLLOWING WEEKEND AND MET WITH THE SERVICE MANAGER. HE PULLED FOUR PROBLEM CODES, WHEN HE CHECKED AND MADE AN APPOINTMENT TO HAVE THE BIKE REPAIRED ON THE 21ST OF JUNE. HE INDICATED THAT HE FELT THAT THE PROBLEM WAS IN THE THROTTLE "FLY-BY-WIRE" SYSTEM AND THAT THE CONTACTS NEEDED CLEANING. I HAVE NOT BEEN USING THE CRUISE CONTROL SINCE THAT TIME, THINKING THAT THIS WAS THE PROBLEM. HOWEVER, WHILE GETTING ON THE INTERSTATE THE OTHER DAY, IN ORDER TO GET TO THE NEXT EXIT, THE BIKE SHUT DOWN ON ME, ONCE AGAIN. THIS TIME, IT WAS WITHOUT THE CRUISE CONTROL BEING ENGAGED, SO I IMMEDIATELY KNEW THAT THE PROBLEM WAS SOMETHING DIFFERENT. FRANKLY, IN BOTH SITUATIONS,THE SUDDEN DECELERATION WAS QUITE DISCONCERTING. TO A LESS EXPERIENCED RIDER, IT COULD BE DOWNRIGHT FRIGHTENING AND, EITHER WAY, THIS PRESENTS, IN MY ESTIMATION, A VERY SERIOUS DANGER TO RIDERS.

NHTSA ODI #10406672

Official recalls

3

18V076000 · Service Brakes, Hydraulic:antilock/traction Control/electronic Limited Slip; Service Brakes, Hydraulic:fluid

Jan 29, 2018

Harley-Davidson Motor Company (Harley-Davidson) is recalling all 2008-2011 Touring, CVO Touring and VSRC motorcycles equipped with anti-lock brakes (ABS), including Road King (FLHR), Road King Police (EFI) (FLHP), Road King Police (EFI) (FLHPE), Electra Glide Standard Police (EFI) (FLHTP), Electra Glide Classic (EFI) (FLHTC), Electra Glide Ultra Classic (EFI) (FLHTCU) and Street Glide (EFI) (FLHX), 2008 VROD (VRSCAWA), CVO Road King 4 (FLHRSE4), Night Rod (VRSCDA), CVO Ultra Classic 3 (FLHTCUSE3), Night Rod Special (VRSCDXA), 2008-2010 Road King Classic (EFI) (FLHRC), 2008-2009 Road Glide (EFI) (FLTR) and Electra Glide Standard (EFI) (FLHT), 2009-2010 V-Rod (VRSCAW), 2009 CVO Ultra Classic (FLHTCUSE4) and CVO Road Glide 3 (FLTRSE3), 2009-2011 Night Rod Special (VRSCDX) and V-Rod Muscle (VRSCF), 2010 CVO Ultra Classic 5 (FLHTCUSE5) and CVO Street Glide (FLHXSE), 2010-2011 Electra Glide Ultra Limited (FLHTK) and Road Glide Custom (FLTRX), 2011 Road Glide Ultra 103 (FLTRU103), Street Glide 103 (FLHX103), Road King Classic 103 (FLHRC103), CVO Ultra Classic 6 (FLHTCUSE6), CVO Road Glide Ultra (FLTRUSE), Road Glide Custom 103 (FLTRX103), and CVO Street Glide 2 (FLHXSE2) motorcycles. Deposits may form on components within the brake system if the DOT 4 brake fluid is not replaced for a prolonged period of time beyond the 2-year maintenance schedule specified in the Owner’s Manual.

Consequence & remedy

Consequence: These deposits may cause a valve within the ABS Hydraulic Control Unit to stick, reducing braking ability and increasing the risk of a crash.

Remedy: Harley-Davidson will notify owners, and dealers will flush the entire brake system with new Platinum Label DOT 4 brake fluid, free of charge. The recall began on February 14, 2018. Owners may contact Harley-Davidson customer service at 1-800-258-2464. Harley-Davidson's number for this recall is 0171.

Additional source detail variants (2)

Service Brakes, Hydraulic:antilock/traction Control/electronic Limited Slip

Harley-Davidson Motor Company (Harley-Davidson) is recalling all 2008-2011 Touring, CVO Touring and VSRC motorcycles equipped with anti-lock brakes (ABS), including Road King (FLHR), Road King Police (EFI) (FLHP), Road King Police (EFI) (FLHPE), Electra Glide Standard Police (EFI) (FLHTP), Electra Glide Classic (EFI) (FLHTC), Electra Glide Ultra Classic (EFI) (FLHTCU) and Street Glide (EFI) (FLHX), 2008 VROD (VRSCAWA), CVO Road King 4 (FLHRSE4), Night Rod (VRSCDA), CVO Ultra Classic 3 (FLHTCUSE3), Night Rod Special (VRSCDXA), 2008-2010 Road King Classic (EFI) (FLHRC), 2008-2009 Road Glide (EFI) (FLTR) and Electra Glide Standard (EFI) (FLHT), 2009-2010 V-Rod (VRSCAW), 2009 CVO Ultra Classic (FLHTCUSE4) and CVO Road Glide 3 (FLTRSE3), 2009-2011 Night Rod Special (VRSCDX) and V-Rod Muscle (VRSCF), 2010 CVO Ultra Classic 5 (FLHTCUSE5) and CVO Street Glide (FLHXSE), 2010-2011 Electra Glide Ultra Limited (FLHTK) and Road Glide Custom (FLTRX), 2011 Road Glide Ultra 103 (FLTRU103), Street Glide 103 (FLHX103), Road King Classic 103 (FLHRC103), CVO Ultra Classic 6 (FLHTCUSE6), CVO Road Glide Ultra (FLTRUSE), Road Glide Custom 103 (FLTRX103), and CVO Street Glide 2 (FLHXSE2) motorcycles. Deposits may form on components within the brake system if the DOT 4 brake fluid is not replaced for a prolonged period of time beyond the 2-year maintenance schedule specified in the Owner’s Manual.

Consequence: These deposits may cause a valve within the ABS Hydraulic Control Unit to stick, reducing braking ability and increasing the risk of a crash.

Remedy: Harley-Davidson will notify owners, and dealers will flush the entire brake system with new Platinum Label DOT 4 brake fluid, free of charge. The recall began on February 14, 2018. Owners may contact Harley-Davidson customer service at 1-800-258-2464. Harley-Davidson's number for this recall is 0171.

Service Brakes, Hydraulic:fluid

Harley-Davidson Motor Company (Harley-Davidson) is recalling all 2008-2011 Touring, CVO Touring and VSRC motorcycles equipped with anti-lock brakes (ABS), including Road King (FLHR), Road King Police (EFI) (FLHP), Road King Police (EFI) (FLHPE), Electra Glide Standard Police (EFI) (FLHTP), Electra Glide Classic (EFI) (FLHTC), Electra Glide Ultra Classic (EFI) (FLHTCU) and Street Glide (EFI) (FLHX), 2008 VROD (VRSCAWA), CVO Road King 4 (FLHRSE4), Night Rod (VRSCDA), CVO Ultra Classic 3 (FLHTCUSE3), Night Rod Special (VRSCDXA), 2008-2010 Road King Classic (EFI) (FLHRC), 2008-2009 Road Glide (EFI) (FLTR) and Electra Glide Standard (EFI) (FLHT), 2009-2010 V-Rod (VRSCAW), 2009 CVO Ultra Classic (FLHTCUSE4) and CVO Road Glide 3 (FLTRSE3), 2009-2011 Night Rod Special (VRSCDX) and V-Rod Muscle (VRSCF), 2010 CVO Ultra Classic 5 (FLHTCUSE5) and CVO Street Glide (FLHXSE), 2010-2011 Electra Glide Ultra Limited (FLHTK) and Road Glide Custom (FLTRX), 2011 Road Glide Ultra 103 (FLTRU103), Street Glide 103 (FLHX103), Road King Classic 103 (FLHRC103), CVO Ultra Classic 6 (FLHTCUSE6), CVO Road Glide Ultra (FLTRUSE), Road Glide Custom 103 (FLTRX103), and CVO Street Glide 2 (FLHXSE2) motorcycles. Deposits may form on components within the brake system if the DOT 4 brake fluid is not replaced for a prolonged period of time beyond the 2-year maintenance schedule specified in the Owner’s Manual.

Consequence: These deposits may cause a valve within the ABS Hydraulic Control Unit to stick, reducing braking ability and increasing the risk of a crash.

Remedy: Harley-Davidson will notify owners, and dealers will flush the entire brake system with new Platinum Label DOT 4 brake fluid, free of charge. The recall began on February 14, 2018. Owners may contact Harley-Davidson customer service at 1-800-258-2464. Harley-Davidson's number for this recall is 0171.

11V506000 · Exterior Lighting:brake Lights:switch

Oct 19, 2011

HARLEY-DAVIDSON IS RECALLING CERTAIN MODEL YEAR 2009-2012 TOURING, CVO TOURING AND TRIKE VEHICLES MANUFACTURED FROM JUNE 6, 2008, THROUGH SEPTEMBER 16, 2011. SEE THE ABOVE LIST FOR THE MODELS INCLUDED IN THE RECALL. THE REAR BRAKE LIGHT SWITCH MAY BE EXPOSED TO EXCESSIVE HEAT FROM THE EXHAUST SYSTEM.

Consequence & remedy

Consequence: THE EXCESSIVE HEAT MAY CAUSE THE SWITCH TO NOT ACTIVATE THE BRAKE LAMP OR ACTIVATE THE BRAKE LAMP WHEN NO BRAKE IS APPLIED AND/OR CAUSE A BRAKE FLUID LEAK AT THE BRAKE LIGHT SWITCH, AFFECTING REAR BRAKE PERFORMANCE. EITHER CONDITION MAY INCREASE THE RISK OF A CRASH.

Remedy: HARLEY-DAVIDSON WILL NOTIFY OWNERS, AND DEALERS WILL A INSTALL A REAR BRAKE LIGHT SWITCH KIT, FREE OF CHARGE. THE SAFETY RECALL IS EXPECTED TO BEGIN DURING OCTOBER 31, 2011. OWNERS MAY CONTACT HARLEY-DAVIDSON AT 1-414-343-4056.

09V457000 · Fuel System, Gasoline:storage:tank Assembly:mounting

Dec 1, 2009

HARLEY-DAVIDSON IS RECALLING CERTAIN MODEL YEAR 2009 AND 2010 TOURING FAMILY MOTORCYCLES, INCLUDING CVO TOURING AND TRIKE PRODUCTS, MANUFACTURED FROM JUNE 6, 2008 THROUGH NOVEMBER 19, 2009. THE FRONT FUEL TANK MOUNTS MAY DISTORT IN REACTION TO SEVERE FRAME DAMAGE FROM A FRONTAL COLLISION. THIS CONDITION MAY CAUSE A FUEL LEAK AT THE WELD OF THE FRONT BRACKET TO THE TUNNEL.

Consequence & remedy

Consequence: A FUEL LEAK IN THE PRESENCE OF AN IGNITION SOURCE MAY RESULT IN A FIRE, WHICH COULD LEAD TO INJURY OR DEATH TO THE RIDER.

Remedy: DEALERS WILL INSTALL A LEFT AND RIGHT BRACE, WHICH ARE INTENDED TO REDUCE FRONT MOUNT DISTORTION DURING CERTAIN CRASH CONDITIONS. THIS REPAIR WILL BE PERFORMED FREE OF CHARGE. THE SAFETY RECALL BEGAN ON DECEMBER 11, 2009. OWNERS MAY CONTACT HARLEY-DAVIDSON AT 1-414-343-4056.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

1

PE16009 · Sudden Brake Failure - Motorcycle

Opened Jul 6, 2016 · Closed Apr 23, 2018

Status: closed (inferred from source dates) · Service Brakes, Hydraulic:antilock/traction Control/electronic Limited Slip:control Unit/module

The Office of Defects Investigation (ODI) opened this investigation in July 2016 based on forty-three (43) Vehicle Owner Questionnaires (VOQ).During the course of this investigation ODI received a total of 145 VOQs related to the alleged defect on the subject motorcycles.Owners allege they experience a sudden and complete loss of brakes on one or both wheels.To better understand the cause of the braking issue on the subject motorcycles, ODI requested NHTSA's Vehicle Research and Test Center (VRTC) conduct inspections and testing of affected vehicle braking systems.Through its work, VRTC determined that deposits were forming on the valves in the Hydraulic Control Unit (HCU) of the Antilock Braking System (ABS). These deposits could prevent the proper function of the HCU and render the brakes ineffective.To understand why deposits were forming in the HCU, Harley Davidson completed an analysis of the Dow 460 brake fluid used as original equipment on the subject motorcycles and determined that it had stability issues if left in the brake system for an extended period of time.Harley Davidson found that if a brake fluid flush was not conducted as outlined in the owner?s manual for the motorcycles, and was left in the system for a period of time beyond their recommendation; deposits could form in the HCU.Through further testing, Harley Davidson identified an alternate, commercially available, brake fluid that did not have the same stability issues as the original fluid and could stop the proliferation of any current brake system deposits.ODI sent Information Request (IR) letters to Harley Davidson and Dow Chemical (the supplier of the brake fluid on the subject motorcycles) to collect information about the subject bikes and the alleged defect.Harley Davidson responded in full on Sept 30, 2016 and Dow responded with a confidential submission on October 25, 2017.ODI analyzed the information contained in both IR responses and concluded that motorcycles manufactured during Model Years (MY) 2008, 2009, 2010, and 2011 were failing at a rate greater than their peers.Based on this analysis and the brake fluid study conducted by Harley Davidson, a group of motorcycles was identified that were potentially affected by the instability of the original brake fluid.2008 marked the introduction of ABS on Harley Davidson motorcycles and a change in the Dow 460 brake fluid used in the 2012 MY vehicles provided the bases for the scope of the affected population.With recall action 18V-076 taken by Harley Davidson this investigation is closed as further use of agency resources does not appear to be warranted.The ODI reports cited above can be reviewed at: https://www.nhtsa.gov/ using the complaint identification numbers attached to this resume.