I am hoping I can get some help here. I bought my wife's 2015 Street Glide Special used and not too long after it we were riding and the ABS and check engine lights came on. We stopped, turned the bike off and restarted it. The lights were now off. This happened a couple time in the 4000 miles she has ridden it. Fast forward a couple months and I changed out the bars for 10"ers. After a couple rides the lights were more intermittent and I lost the clutch side controls. I took it back apart and I found a recessed pin on the HD extension cable I used for the bar install. After I got it all back together everything is working great (controls work and no light right now) I went through and cleared all the codes. Right now I have code U0121 hard set on the BCM and RAD circuit. Dose anyone have ides on what to look for next to fix this U0121 code issue I am having now?

Thank you in advance for any help you can provide.

 

U0121 Lost comm W/ABS / I'm surprised you don't have the ABS light on.

 

It comes on intermittently. But typicality turning off the bike and restarting clears it. Anyone have any ideas of where I can look for loose connections or broken wires?

Thank you,

Marc

 

Hi Marc

This is an old thread and I hope you are still on the road. I am facing a very similar issue (U0121 on BCM and SPDO) with my Fat Bob (2014). Checked all the wires and connectors but found nothing wrong. I searched the internet and found almost nothing, apart from this thread.
Were you able at the time to resolve this? If so, do you remember what the cause was?

Thanks in advance!

Steven

 

Just FYI, his last activity on this site was 5 years ago, hope he's still around to answer your question. Good luck getting it solved.

 

Did you recently have a dead battery? Have you tried clearing the code to see if it will come back?

 

I cleared the codes several times already, but they keep coming back. Unfortunately, this is rather unpredictable. I made a 400 km trip in the week-end and no codes at all. Yesterday, after riding to work and back (40 km total), it had produced them again. The battery should be fine, I keep it charged with a trickle charger and starting was never a problem.
I am currently disassembling the battery bay and ECM bay again to check everything once more and clean all connectors with contact spray. If I don't find anything suspicious, I plan to start it and manually move the wires to simulate movement/shocks on the road. See if I can trigger the code generation that way. After that I will be out of inspiration :-(. Any ideas are very welcome :-).

 

Does the bike have ABS? My guess is that your connector issues are going to be up in the spine of the bike where the hand controls meet the harness.

 

Hi Snake_eyes, yes it has ABS. You mean the location right behind the steering head, under the tank?
There are several connectors there indeed. I checked them before and saw nothing suspicious at that time, but I didn't unwrap the cable harness or so.
Do you have a specific reason to suspect that location? If you think the cause is more likely there, I will check it again.

 

I thought that was the same code I was getting on my Dyna and the wife's Softail, and both were related to a loose wire for the start/stop switch which was definitely in the nest of wires below the tank. I might be misremembering the exact code though so my apologies if that's the case.