Sometimes it would be nice if you provided a little more info like the year of the bike and mods that you had done to the bike. B codes are related to the audio system and since the left rear speaker is out it would be a good place to start.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.