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Re: Gm 2500hd, no comms with tech 2
Posted to HD/Fleet Forum on 4/10/2011 2 Replies

I have factory manuals for 2005 which should be real close. the diag/dlc connector is good or else you could not talk to any other module. the comms line is good. check for any fault codes from any other systems and let me know. i'll look at manual tomorrow Login to read more.

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