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Update for anyone else in the future or interested...

The original 5.3 ECM worked. Blindsquirrel - thanks for the heads up on the segment swapper function not working due to the operating system...

The repository has a couple for a Silverado and 6.2. There is a stock tune for a 2010 and a modified tune for a 2009. There is another 5.3 > 6.2 file for a 2007 Silverado (not sure if that is for...

I have technical service manuals for a 2008 Silverado. The 6-13 Theft Deterrent Control Module Programing and Setup instructs that a Techline Terminal needs to be used to access the Vehicle Theft...

Thanks. For future reference, I am in the US (Washington) and it was a US domestic truck.

Looking around, I found the relearn procedure for the Passcode which is for transponder keys. I tried it anyways and no dice. any other security relearn procedures for the ECM?

Thanks.

and sorry, that should ready 6l80e... not 4l80e.

Thanks BSquirrel. I will hunt around for the security relearn procedure. If you know of a thread or resource, that would be appreciated.

5FDP - The transmission is correct, I believe it was a...

Hi,

I have a 2009 Silverado 5.3 with 4l80e. I am swapping in a 6.2 from a 2009 Yukon XL (also had a 4l80e). I've finished the conversion and am having difficulty with the ECM / Theft Deterrent...