| Re: Found this GM site that displays all your ECM updates, etc. with your VIN!
No, it shows the "calibration history" which means it shows you previous updates that were available but not necessarily used.
When we use the programming application (TIS2WEB) to update the software in any module it shows the history.
There is a long tree (or short) with all the calibration numbers that used to be available and at the bottom there may only be one choice or there could be 2 or 3 depending on vehicle options.
When programming you can obviously only select one and if the tree ends with one number, it is automatically selected because we are only allowed to use the latest one.
We cannot backdate software.
I tried punching in a VIN but I don't know if my Vista computer won't work or if something is wrong with that link.
At any rate, I hope I cleared that up.
It is basically an informational tool only and it rarely gets used.
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