Has anyone else had their timing chain(s) replaced with the P0017 and P0018 code(s) and did it fix the issue? My 2007 AWD XE (40,000) miles had the P0017 and P0018 check engine codes come on and off for a week. I took it too the Saturn Auth Chevy dealer who stated it was a stretched timing chain that would have to be replaced and it will be in the shop the next 3-4 days.