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My son has a 2003 Duramax and tried to download the Hypertech and it gave him a Error code 7E. He called Hypertech and they said to remove any aftermarket electronics because the code means there is a constant power draw causing the error.

Woops, sorry about the two posts, my key board didnt like the error code. Anyway anybody have any ideas?

Thanks!
 

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mainly just make sure everything is off...radio, heat etc.
 

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I don't know if you found this out already but it could be the OnStar on the truck. I had to pull my info fuse out of the main fuse block before the install of mine. Hope everything works out ok.

-Oside
 
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