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International Automotive Technicians Network
Re: GM Programming Error Code E4491
Posted to Technical Discussion Forum on 11/13/2015

We were using the "Tech 2 Legacy Pass-Thru" programming option. I do not see any evidence of aftermarket components being connected to the Class 2 data network, and it does not have an aftermarket radio.

We are using a Keyspan USB-to-serial adapter to conne... Login to read more.