I have 15000 miles on my G2 volt and have never heard a rattle/pop noise when transition or when using ICE. Do you have any warning on the console when using ICE? I'd have a tech check at the dealership but before doing this you may want to confirm this witha few more drives to make sure that ICE is the issue.Moving on, when I have my volt 2016 in "HOLD mode" and just using the ICE alone, i have noticed this wish washing noise followed by a rattle/ popping noise. Has anyone experienced this? Should i be concerned?