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Vehicle speed controlPart report

2008 Harley-Davidson Flhx Vehicle speed control Problems

Complaints
5about this part
Share
17%of 30 total for the year
Median mileage
27,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 5 complaints about the vehicle speed control of the 2008 Harley-Davidson Flhx, 17% of the 30 complaints for this model year. Where a mileage was given, the median is 27,000 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“While driving on a very busy highway at around 60 MPH I went to pass a car and while in the other lane passing I lost all throttle. This has happened numerous times and very dangerous. I have been riding motorcycles for 40+ years and can't even imagine what would happen to an inexperienced rider. I can not to this day get a straight answer from dealer's or mechanics. I guess this is all included in the $22,000 I dished out.very very dangerous. There are definite issues with the electronic throttle (fly by wire).”

NHTSA complaint #10512689, filed 2013-05, 30,000 miles

“Fly by wire throttle on touring and cruiser harley-davidsons begins to rev / race without even turning the handle. Happens quite frequently once it begins. Particularly hazardous during turns and starting out in traffic. Has occurred on my motorcycle about 15 times in the past week. 3 times it almost caused me to crash in a turn. Called local hd dealer and they came to pickup motorcycle 5/25/10 to service. Service manager says they have been having problems with this throttle system.”

NHTSA complaint #10332236, filed 2010-05, 24,000 miles

“I was driving down the high way and was in the fast lane when all of a sudden my throttle stopped responding and I lost power to the bike I then pulled the clutch in so I didn't come to sudden stop and get rear ended by the car behind me and I eased over the median and noticed my check engine light was on so I turned the bike off and waited a few minutes and started it back up and the light returned and I was able to get it back to the house with limited throttle and power and crossing the two lanes for traffic to get off the highway was the scariest thing I have had to do on a bike I wasn't…”

NHTSA complaint #10566569, filed 2014-02, 30,123 miles

“Complete throttle failure at highway speed. Error codes collected indicate electronic throttle response failure. I have experienced this failure on multiple occasions. Postings on hd forums indicate the problem is wide spread on hd motorcycles from 2008 forward with an electronic throttle control system. This is an extremely dangerous hazard for which hd has failed to accept responsibility or offer to correct. Please investigate!”

NHTSA complaint #10449386, filed 2012-02, 20,000 miles

“2008 harley FLHX, while traveling at normal speeds the vehicle loses throttle control, the engine is still running just no throttle response 'fly by wire throttle', this has happened numerous times and I have taken it back to the dealership on four occasions, they have replaced the ECM, throttle body sensor and connector and connector pins with no results. This situation is extremely dangerous and I have narrowly escaped death on two occasions. The latest event happening nov 4, 2010, the original event happened over a year and half ago. …”

NHTSA complaint #10364131, filed 2010-11

Related service bulletins

Vehicle speed control: other model years

YearComplaintsShare of year
2024110%
2010417%
2009621%
2008517%

Other parts of the 2008 Harley-Davidson Flhx

Brakes
9 complaints
Electrical system
6 complaints
Engine
4 complaints
Fuel system
4 complaints
Transmission and drivetrain
4 complaints
Other or unknown
2 complaints
Wheels
2 complaints
Electronic stability control
1 complaints
Exterior lighting
1 complaints
Seats
1 complaints
Steering
1 complaints
Body and structure
1 complaints

← All problems reported for the 2008 Harley-Davidson Flhx

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology