It's the negative battery cable, it's a known issue with almost all cruzes and should be replaced at no cost by the dealer.
Here is a link explaining the special coverage bulletin (this is covered for 10yrs/120,000 miles):
www.nhtsa.gov
Here is a link explaining the special coverage bulletin (this is covered for 10yrs/120,000 miles):

Home | NHTSA
Get resources and info about staying safe on America’s roads. And, find out if there’s a recall on your car or how to report a vehicle safety problem.