I have a 09 ultra classic it's throwing P1510 and P2127 codes and going into limp mode when hot. A new handle sending unit has been installed and it continues to throe these codes but now it's only when it gets hot. Any one out there got ab answer? I have checked all connections and load ratings.
Please help!!!!!

 

617 557 3035 that's the number to the dealer in boston call them. i googled that for ya since you didn't know how

 

http://independentmcshop.com/index.php/dtc-s-harley-check-engine-light

 

Or you could just say, "I have no idea, but maybe somebody else does. Therefore, I won't say anything, and I'll let somebody else help".

 

p1510-limited performance mode (ie limp mode)
p2127-tgs2 low/open

sounds like you've got an issue with your twist grip sensor. i would try clearing the codes, making sure everything is clean and well connected, not pinched or broken, and see if it comes back. i know you said you replaced your tgs, but maybe pinched a wire when putting it back together?

i hate electrical gremlins, good luck.