I know that the LMM ECM keeps a history of the last 10 times it was programmed, but I don't think the LBZ ECM has a history capability.
The attached GM document contains instructions for Confirming Calibration Verification Number (CVN) on 2005-2007 LLY & LBZ. I think this would work only if a non-stock cal is still in the ECM when checked. Am I right in my thinking?
If one were to program an LBZ either with EFILive or a handheld programmer and then re-flash it back to stock using the same tool, will there be any trace indicating that the ECM had been previously flashed with non-stock calibrations?
Thanks.