I have a 2005 lly and i ordered a used autocal offline, i got it and scanned my stock tune off before i got a new license vin and the tunes. The tunes came from a different company so i linked the autocal to the ppei from the old one, got the unlink code and linked the new one. However now i cant even read the stock tune off.. it gives me 0537 code but if i unlink from ppei and link to the old owner i can read it again but not program because my tunes came from ppei. How can i get passed this??