On my way home from an extended trip around the Maritimes and Ontario, my 03 K1200LT stared to cut out. On the xway with cruise control on, it would drop to idle. The cruise light never went out. this happened several times but I made it home without the aid of a trailer. after I got home I ran a diagnostic on it with a GS911 and it said there is an idle switch short-to positive or open circuit. and idle regulator, signal implausible. Would that cause the engine to cut out? the bike has 198000 miles on it.
It would be way better if you save the "Auto-Scan" from GS911 onto a file (as offered in a menu item), so that I could see all data AND all error codes. To be able to post this file here, you may need to rename the extension to a ".TXT" as an ".Html" file might no be allowed as a file attachement here within a message.
Assuming you have only these 2 error-messages, then it is related to a defective (or nor correctly plugged) Idle-Actuator - this is also called TVA in some repair manual. In general, this will not cause the engine to cut-out at normal running RPM above idle. HOWEVER, it can cause engine to cut-out when throttle is close to downshift or to come to a stop (throttle forward at idle position).
If indeed the Idle-Actuator is defective, you would see that engine would not maintain proper idle speed in neutral either/Both when engine is hot or cold. It may become intermittent only when engine is very hot.
AND.... as always, the MOST IMPORTANT QUESTION: what recent work has been done on bike / engine if any?
It is possible someone did not fully pushed in the TVA connector on last maintenance and it became loose over time: this could generate these 2 error codes.
If it is not a typo in your message and engine has 198,000 miles with original Idle-Actuator (TVA), then it may just be a bit old and becoming intermittent. On our K1200 "brick-engine" this component has been very reliable in general BUT it contains a small stepper-motor with a plastic worm-drive mechanism that does wear out eventually. The more stop-go traffic, the harder the TVA is working.