jfcross Posted: 3/11/2011 9:02am PST I 'might' have this situation on my '03 Chev Express. The gas cap has been replaced, tests are passed and ECM reset multiple times. Can't find a reason ($100) for light coming on 2 or so days later! T. Green Posted: 3/10/2011 11:02am PST Hmm - the OEM I used to work at fixed this issue in 1998 - 1999. We did have the same reaction to the dealer report that all of you had. PS - This is also why you find spider webs in your gas grills.