Quote Originally Posted by newmarket23 View Post
I think it's number 7 and number 8
I googled for 2 seconds because I know it's not both pieces.
P0243 GM DTC: Supercharger Boost Solenoid Control Circuit Conditions

You may want to research this problem instead of shotgunning parts at it. If the voltage is wrong..then it might not be either of the boost control pieces.