If rust perforation develops due to a manufacturing defect, it might be covered under the original powertrain warranty or the general corrosion warranty (if applicable, and these are often limited in time). However, surface rust or rust caused by external factors like road salt is typically not covered.
To determine if any rust-related issue you're experiencing would be covered, you'd need to consult your original 2013 Chevrolet Malibu warranty booklet (if you have it) or contact a Chevrolet dealership. They can assess the situation and determine if the damage is covered under any applicable warranty. Keep in mind that warranties have expiration dates, and the original warranty on a 2013 vehicle would likely have expired.
