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I have searched and searched and can not find code b2136 anywhere on any list of Harley trouble codes. One thing I did notice is the p/n for my BCM is the same as the one that was recalled for softail a with security but my bike does not have security. Any help would be greatly appreciated.
What I've found for you appears to be an error in your low beam circuit being open or a short in your headlight to battery circuit.
Are you having any issues with your lighting?