FYI. If you have access to an AutoXray 7000, it will read the Cal Id's(part numbers) and the corresponding CVN for each cal id. You can then check the list from the autoxray to the GM calibration ID page, listed by Vin for your entire vehicle....or by the part number to get the corresponding CVN.


http://tis2web.service.gm.com/tis2web

If they all match exactly then you have a factory tune......

Some of the part numbers could be different from what is on the list, but this could be because an update is available....in this case, input the part number instead of vin to be sure the corresponding cvn matches the cal id(part number)

here is a step by step, just use the autoxray instead of the tech2

http://www.chevytalk.org/fusionbb/sh...hp?tid/188297/



Im interested if anyones vehicle, which was tuned and returned to stock, has all of the matching CVN data.

I just checked a stock 09Z and the data matches...would anyone with their stock file, and an autoXray feel like checking to see if the correct checksums(CVN) are related upon flashing back to stock?