My sensor isnt working

When playing a game like infamous second son theres points where they want me to move the controller to do an action but it wont work ive banged my controller out of pure joy of beating a level as dumb as that is but the controller it self still works i cracked a screw spit in the case but it looks fine other then that i opend it up and i just wanna know what controlls the sensor movement so i could see what i could do any ideas on what i could do and where to look would be helpful