As explained in the HD service bulletin TT418A the fix is the use of "Dielectric Grease" on the Throttle Control Actuator (TCA) plug that is located to the rear of the air cleaner. Your P1511 is the main code and the P2135 is the secondary code but niether one is the problem. Because the pins in the TCA plug lost the perfect connection the TCA failed to function properly and the bike went into limp mode. Read the TT418A bulletin in the stickys for all of the details and go to your HD and bring this bulletin to their attention and they should re-pin the TCA plug with the 2010 style pins at no cost to you. I have yet to do a pin replacement because the dielectric grease has been working well for me. HD put new style (gold plated) pins in the 2010 and later models to help eliminate the corrosion that occurs on the earlier style 08 & 09 style TCA pins.
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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.