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International Automotive Technicians Network
Re: Communication issue
Posted to Technical Theory Forum on 2/12/2018

If the TIPM is the gateway on this truck then unpin the can data lines on the network side (not the dlc side) & jumper those to your scantool. See if you now have comm with anything. You could have a dead or "locked up" TIPM. Sometimes completely removing batt... Login to read more.