Mrdon

I just did this on my 2007 Silverado, step 1 - 6 according to PIT4484H. For step 7 this is what I did. 1) created a free TIS2WEB account. 2) called TIS2WEB to request the calibration change. 3) Supplied login name on TIS2WEB account and vehicle VIN. They will ask you to email a workorder for updating cruise, with parts installed and part numbers. (I just googled a blank auto work order form filled it out and sent it) . 4) If all is well, you will have a updated calibration file on the TIS2WEB site. (took me 3 calls, truck is a 2007.5 there database called it up as a GMT-800 not GMT-900) 5) pay the fee for the new calibration file currently $125, waiting for the bill from them. 6) Now you can take it to dealer or shop to flash latest BCM calibration or flash it yourself. I flashed it myself using a VCX NANO $89 and a $40 2 year 1 VIN subscription on TIS2WEB, my local dealership wanted over $200 just to flash it.