Mine did it on Run for the Wall in May. Here's what all was done to mine, maybe some of this will help:
- Mine threw a code saying something about a 5 volt reference line. The tech at the dealership changed the twist grip sensor, still got the issue, so he changed it again but put in a CVO twist grip sensor
- He kept troubleshooting it and his book told him to change the ECM. He called Harley, Harley said no way it should need the ECM, he told them the book they sent him said it needed an ECM so he was putting one in it. That solved the problem and I made it the rest of the way to DC
- On the way home, it acted up one more time, but not as bad. Pulled over, turned the bike off and back on, and it ran fine the rest of the way home.
- When I got home I did some of my own troubleshooting and found that I had filled the oil all the way to the full mark. It looked like when I had either been riding it hard all day (on the way home) or when it got very hot (first time it acted up) it was burping oil out into the air intake and it was seeping on the throttle body connector behind the intake. It looks like this is what caused it to throw the code. Did it need the ECM and the TGS, who knows
After all that, I changed the air filter, cleaned the throttle body connector with electrical contact cleaner, and refilled it with dielectric grease. I also have made it a point to fill the oil to the middle instead of to the top to give it some room to move before it burps out the side. I have no idea if this is a permanent fix but it has been over 100 several days and I have yet to have the problem again.
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2018 Road Glide Special - Wicked Red