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Re: 2017 Sierra 1500 communication codes U0077 U0126 U0151
Posted to Technical Discussion Forum on 9/28/2021 1 Reply

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As far as I know it is still a valid test. Looking at your wiring diagrams it looks like it should still work. Terminating resistor in the PCM and in then at R6A, Terminating Resistor High Speed Bus.... Login to read more.

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