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International Automotive Technicians Network
Re: 2017 Sierra 1500 communication codes U0077 U0126 U0151
Posted to Technical Discussion Forum on 9/28/2021

Yes, 6 and 14 is still a valid test. Yesterday I was getting something like 500 ohms between them. I must have cycled the key and not had a module shut off or something. This AM I did have 60 ohms and retested 2 minutes after key cycled off, 60 ohms exactly. ... Login to read more.