LBZ Programming History?

[RayMich]

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.

[LBZ]

Seems LLY were also in on this.

[RayMich]

Yes, but I can't tell from this document if they are talking about detecting an existing non-factory calibration, or can they tell on the LBZ even if it has been put back to stock.

[GMPX]

Only the LLM keeps track of history, the others do not.

[LBZ]

Only the LLM keeps track of history, the others do not.

Has anyone tried using this procedure posted above with a Tech 2 to confirm this?

[RayMich]

Only the LLM keeps track of history, the others do not.

OK, so I take it from your response that if you were to program an LBZ or LLY with a tow/economy tune and then re-program it back to stock, there won't be any traces left that it had been programmed before?

[GMPX]

In the latest software I have in my TechII (updated Nov 2008) there is no option to check programming history for the LBZ (or earlier).

[LBZ]

So WTF are they talking about in that bulletin?
Is GM smoking street distributed drugs?

[RayMich]

So WTF are they talking about in that bulletin?
Is GM smoking street distributed drugs?

I believe they are talking about detecting the current cals on an LLY and LBZ.

So, if you haven't re-flashed back to stock with a legal CVN before you take it in, you are screwed...

[GTPprix]

I believe they are talking about detecting the current cals on an LLY and LBZ.

So, if you haven't re-flashed back to stock with a legal CVN before you take it in, you are screwed...

Thats not enough, they hold records of the last I believe 8-10 flashes now, a second ECM is the way to go.