...The bike: A 2018 K1600GTL I bought last Spring with about 800 miles on the clock, to which I added about 1500 miles with no issues.... with no warning the motor suddenly lost power. It did not completely die, but seemed at a fast idle. Brake and clutch worked normal, but shift lever and throttle had no effect. I was able to coast to a safe stop. At many points in this ride coasting to a safe stop would not have been possible...
I'd just ride it home, but keep good distance from anyone behind you.
A little less facetiously, I'd say you don't want anyone close behind you at speed in case the problem recurs. From what I have read, riding it is not likely to damage the bike, you just have to ride safe. Be ready to pull in the clutch if the engine shuts down when you are at speed.
You are not the first to report the engine going into limp mode unexpectedly.
I came across this while researching GTL tranny recall, read sections about "engine, propulsion, etc."
Read the June 10, 2019 complaint.
From that complaint: Quote" DRIVING ON I10 IN NEW MEXICO AT 80MPH, FOLLOWED BY TWO SEMI TRUCKS MY BIKE SUDDENLY QUIT WITHOUT WARNING OR REASON, I CAME VERY CLOSE TO BEING RUN OVER BY THE TWO TRUCKS FOLLOWING ME.
DEALER CONTACTED BMW AND IT APPEARS THEY ARE AWARE OF THIS PROBLEM BUT NO RECALL HAS BEEN INDICATED.
APPARENTLY, ACCORDING TO BMW, THE ELECTRIC CONTACTS ON THE "FLY BY WIRE" SYSTEM ARE COATED WITH A RUST INHIBITOR COMMON IN ANY INDUSTRY. HOWEVER WITH THIS MOTORCYCLES ELECTRICAL SYSTEM IT OCCASIONALLY FAULTS THE SIGNAL FROM THE THROTTLE TO THE ON-BOARD COMPUTER RESULTING IN A MIXED SIGNAL THE COMPUTER CANNOT PROCESS THEREBY SHUTTING THE BIKES THROTTLE CONTROL OFF AND DEFAULTING INTO THE "LIMP MODE" WHICH ELIMINATES ANY THROTTLE CONTROL AND MAINTAINS THE RPM AT 2000 ENABLING THE BIKE TO LIMP TO THE NEAREST GARAGE.
I CASUALLY LOOKED INTO THIS ISSUE ONLINE AND FOUND FOUR OTHER COMPLAINTS ABOUT THIS PROBLEM, THEY WERE ALL 2018 K1600 MODELS." End Quote.