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2018 gmc sierra 5.3 110K P0700

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Sep 16, 2020, 10:36 AM

Post #1 of 3 (142 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
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Sep 16, 2020, 10:50 AM

Post #2 of 3 (139 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.


Sep 16, 2020, 12:12 PM

Post #3 of 3 (129 views)
Re: 2018 gmc sierra 5.3 110K P0700 Sign In

Was afraid of that, thank you 😊

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