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International Automotive Technicians Network
Re: GM Reprogramming Error E4399
Posted to Technical Discussion Forum on 1/27/2015 2 Replies

Michael gave you lots of great info. I have had this error pop up on occasion. I once gave up on Tech2 programming, grabbed my MDI and it went through easily. I now grab my MDI 1st as programming is much quicker anyway. Even if I need to grab the Tech2 afterwa... Login to read more.

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