Codes p0700 and u073

2008 GMC YUKON
99,000 MILES • 6.2L • V8 • 4WD • AUTOMATIC
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DUSTIN WALKER 1987
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Transmission defaults to low gear, after I reset the DTC with scanner it goes back to normal. Symptoms return at random times while driving! Sometimes immediately and sometimes maybe a day or 2 later?
Apr 1, 2021 at 7:29 AM
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ASEMASTER6371
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Good morning,

The 700 code is an information code that tells you there are other codes related to the transmission.

https://www.2carpros.com/articles/automatic-transmission-problems

The 73 code is a communication code for the serial data line. Apparently, the Transmission is not communicating on the data line.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

I attached below the description and the flow chart for the 73 code.

Roy

Apr 1, 2021 at 9:37 AM