Softail Slim

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Oct 9, 2025 | 05:11 PM

#11

ksol5

Road Master

Joined: Aug 2019

Posts: 876

Likes: 525

From: Central NY

I had a 2015 slim that gave me fits, shutting down while cruising along, not starting, lights flashing on and off. It turned out to be the on/off switch on the tank. After I replaced that, I had no problems. It got to a point over time where it would start sputtering, lights flashing where I could wiggle that switch around and either correct it, or cause it.

Last edited by ksol5; Oct 9, 2025 at 05:12 PM.

Oct 9, 2025 | 05:14 PM

#12

hattitude

Seasoned HDF Member

Joined: Sep 2008

Posts: 14,017

Likes: 11,021

From: San Diego, CA

Never mind my initial response, I misread the year of your bike.... I thought it said "2005"....

Last edited by hattitude; Oct 9, 2025 at 05:17 PM.

Oct 9, 2025 | 05:27 PM

#13

hattitude

Seasoned HDF Member

Joined: Sep 2008

Posts: 14,017

Likes: 11,021

From: San Diego, CA

Quote:

Originally Posted by Henfry1966

So this is my original thread. So like I said in the last post, the bike starts correctly but it is in limp mode. I have no throttle response. I disconnected the negative battery cable overnight to let the ECM reset. Didn't work.

The BCM that I bought from ebay has the same axis and the same model number I think that I may have to have it paired with the ECM.

Any thoughts from you guys.

Last thing I do have my Pro Street Tuner and the software can I use this to try and fix the issue?

What diagnostics lead you to believe you needed a BCM?

Any diagnostic codes?

To specifically answer your question, any time you change an ECM or BCM, there is a required procedure. I believe Harley calls it a "Password Learn" procedure, needed for proper communications between the two modules.

It can be done by the dealer's computer (Digital Tech II), an independent shop or friend with a TechnoResearch Centurion Pro diagnostic tool, or there may also be a customer manual entry procedure, rather long and specific, like with the old TSSM. I'm just not sure about a customer procedure for the BCM..

Oct 10, 2025 | 09:11 PM

#14

Henfry1966

1st Gear

Joined: Aug 2025

Posts: 5

Likes: 2

From: Rochester, NY

What lead me to the conclusion that it was the BCM is that I checked the wiring harness and found nothing wrong with any of the wires. The BCM that I bought from ebay when hooked up the bike starts correctly. The original BCM when hooked up starts the bike with everything in the off position.