Greetings, Why does my 2015 FXDL alarm sound its siren with the engine running? With the fob present with a new battery and a fully charged bike battery, the engine starts and runs like normal but the siren sounds for about 10 seconds on and 10 seconds off and just keeps on repeating that pattern. Doesn't ask for a PIN entry! When the engine is switched off it resets and arms itself and all is quiet until I start it again. Even reentered the PIN. 

Still under warranty? Make it the dealers problem, sounds like a faulty sensor of some sort.