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International Automotive Technicians Network
Re: 05 Silverado Duramax Class 2 network problem
Posted to Technical Discussion Forum on 1/3/2020

It's Class 2, it should have a "comb" where all the module communication circuits come together. Look at the schematic, find and open the comb. Jumper your DLC to each module in turn. Should be simple to find the one holding the circuit high. Login to read more.