odometer & ecm's

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Sep 17, 2017 | 08:41 PM

bobdre16

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Stage I

Joined: Sep 2017

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From: Arizona

odometer & ecm's

After the dealer replaced my ecm (and a few more electrical items)on my '16 Ultra Limited, I gained 20k miles on my odometer. How can changing a ecm changed the odometer itself, could they of used a previously installed ecm from another bike?

Thanks in advance for any comments

Sep 17, 2017 | 08:51 PM

Zoider

Grand HDF Member

Joined: Jun 2017

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From: Salt Lake City, Utah

I believe the odometer gets the mileage from the ECM. At least when my wife replaced the speedometer on her 2009 Crossbones the new speedometer picked up the mileage as it was on the old one. Maybe the dealer had to do something to make it interface, I know it came with a cable.

Last edited by Zoider; Sep 17, 2017 at 09:02 PM.

Sep 18, 2017 | 06:46 AM

roussfam

Seasoned HDF Member

Joined: Jan 2009

Posts: 12,686

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From: Ottawa, Ontario

Quote:

Originally Posted by bobdre16

They usually take it for a test drive after work is done on the bike. Maybe they just really wanted to be sure it was fixed

Sep 18, 2017 | 09:50 AM

bustert

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Joined: Aug 2008

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very true on some older ones using speedo storage and newer the ecm. however, there should be no additional mileage and if so, make the dealer correct it. if the ecm was new, the dude that flashed it probably was off!!! the mileage is stored in a rom and not ram so once burned in, can not change. if they refuse, ask for the dealer's factory rep. it may be only 20k but it makes a diff for value.
on some of the old car systems, there was a special software that could access the speedo but i do not think hd allows that.