Hi everybody, this is the "newbie" Giovanni from Italy.
I found this forum while surfing for information about a problem that occurred yesterday to me. It seems quite similar to what you are talking about: while riding to work, the "check engine" light suddenly turned on and the engine suddenly turned into limp mode.
I called the dealer and he told me that he needs to plug the computer into to bike to check it. I haven't tried to get the error codes from the bike (I'll do it later), but I am quite sure I'll find the "infamous" P1511 and P2135.
My bike is a 2009 Road King with some 14k miles on it. The problem had never shown up before.
I feel a bit depressed because
a) it looks like the problem is a common one
b) I already had a starter problem (it needed to be replaced) a few months ago, so putting the money into bike repair is becoming a standard... :-((((
Giovanni