n3d to replace 07stereo with 2010 stereo but it is locked and needs some sort of code
 

does anyone know how to get the code

From a GM dealer to unlock the vin to match it to your vin.
do you have the vin from the car it came from?

yes I have both cars

Now the only problem I can think of is the dealer might not have staff there that knows how to vin match it.
call them or stop by with both radios.