Check engine light at 75mph +
1st module is "P" - ECM stored codes
push button = "none" in display
push button = "part # of module will be displayed"
push button = "S" flashing - TSM codes
push button = "none" or "code" displayed
push button = "part # of module will be displayed"
this goes on for two more modules, if you don't have a tach, mine showed "N/A" in the display.
To clear the stored DTC's, when the display says "end" after you've been through all the modules, just press and hold the button for at least 5 seconds, and the codes will be cleared from memory. If you don't clear the codes, they will flush out automatically after something like 25 "cycles" or start-run-stops, if the issue doesn't happen within this time frame.
When the codes are cleared, your check engine light won't come on after you've started the bike.
I am sure the problem was just a front spark plug wire not pushed in completely. When I checked the plugs that Saturday night, I noticed that the front plug wire came off much easier than the rear plug wire. The engine never ran rough so I think somewhere along the trip vibration or hitting a bump made the somewhat loose wire miss a spark and trigger the DTC. A whole lot of worrying on my part for just a loose spark plug wire. If it had been loose enough to come off or cause the engine to miss then I would have figured it out early on and had a more enjoyable day.

Thanks again. Great people, great forum.
The dealer I chose to do the service assured me they would get me right in and right back out. They did, but on the way home, the check engine light came on. I called them and turned around and drove 90 mph all the way back up there to get there in time for them to take a look at it so I still had a chance to go on the trip with my wife the next day.
They said one of the plug wires wasn't making contact and it was only running on one cyclinder. I found that hard to believe so I asked him if he thought it would run 180 mph back home since I was firing on both now.......
I guess it doesn't take much of an interruption in the firing to throw that code. No way my bike was only running on one cyclinder.
Dennis
https://www.hdforums.com/forum/gener...odes-dtcs.html
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