"Certified" means what? I bought a certified 2013 Volt then a week later noticed a chip in the windshield, I checked a photo I took in the Dealer lot prior to buying, Yup the chip was there. Dealer would replace the windshield but only with a cheap one, I had to pay $150 to get an OEM one. I also found lug nuts loose when I rotated the tires myself. Buyer needs to inspect. Certified is just a sales gimmick, it appears.