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2018 gmc sierra 5.3 110K P0700 Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical wrightdj Novice Sep 16, 2020, 10:36 AM Post #1 of 3 (828 views) 2018 gmc sierra 5.3 110K P0700 Sign In truck would not start, found codes P0700, U0100, U0073, U0101, was trying to clear codes, started up and drove home, reduced power. Checked wiring, seams OK, small trans fluid leak at RH of Radiator, topped up, and ran fine for about 15 minutes, then reduced power and codes. Hammer Time Ultimate Carjunky / Moderator Sep 16, 2020, 10:50 AM Post #2 of 3 (825 views) Re: 2018 gmc sierra 5.3 110K P0700 Sign In The P0700 is just a generic ECM code that is telling you that there are more specific codes in the TCM relating to a trans problem. The big issue is the "U" codes. They are indication that the data communication network is going down. That usually means either a wiring problem or one of the many communicating modules is bad and shorting out the communication network. You are going to need a skilled electrical professional to find this issue. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. wrightdj Novice Sep 16, 2020, 12:12 PM Post #3 of 3 (815 views) Re: 2018 gmc sierra 5.3 110K P0700 Sign In Was afraid of that, thank you 😊   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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