Welcome to the forum!
Is the bike just doggy or is there very little throttle response, how high does the RPM go to in the bikes present condition???
The P1510 DTC- TCA Limited response is going to be a DTC you will always see when there is a problem of most any kind, The ECM will see a problem with something and it will put the bike in limp mode to protect the engine.
Limp mode is where the bike has very little throttle response and you have just enough power to get the bike to a safe area.
The other 2 DTC you have are directly related to the TGS (Twist Grip Sensor) and that is your problem. The TGS is actually the throttle control in the handlebar, and it is a common problem with some of the late models Harleys.
You would either need to replace the TGS which is only a $90 item or you can try cutting the green connector and soldering the wires together. To get to the TGS you will need to remove the switch housing enough to pull the throttle grip off then the TGS will pull out of the end of the handlebar, in most cases you would need to remove the outer fairing and find the TGS plug to give you enough slack to get the green TGS plug which is inside the handlebar to end of the handlebar so you can work on it.
I would suggest going and getting the Harley service manual for your bike as soon as possible it will give you detailed information on how to repair most anything on the bike.
Also you should clear the DTCs you may get your throttle /power back but the problem could return until the TGS is addressed.
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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.
Last edited by ironmark; 06-05-2015 at 10:01 PM.