Approximately 13,049 US C8s from 2020-2021 have potentially improperly cast wheels according to GM Service Bulletin N202315730. Here is the notice, and pics.:
Consider this: GM expected that 90% of vehicles inspected will not have a single wheel replaced (see note below ***). I think that customers which have all four wheels with visible defects on the surface are the lucky ones, and that the unlucky ones are those with one or more wheels which have internal defects which are not visible on the surface...Oh boy, here we go again. At least GM is admitting it this time. There is no excuse for such wheels to leave the manufacturing facility, and be shipped to the Assembly Plant, overlooked by QC, then installed as if everything is ok. Now, the worst part of this is we have only seen the surface of the wheel. What do you think is lurking beneath? Yup, loads of defects which should have been caught by fluoroscopy on the process line. Welcome to a new round of cracked/bent wheel issues.