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Codes P0700 and u073

Tiny
DUSTIN WALKER 1987
  • MEMBER
  • 2008 GMC YUKON
  • 6.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 99,000 MILES
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?
Thursday, April 1st, 2021 AT 7:29 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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

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Thursday, April 1st, 2021 AT 9:37 AM

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