What is this?
I just sent new picture
That is a very dirty plug in socket for an OBDII scanner. Commonly called an OBDII port.
Yep ODB 2 port. Didn't you ask this once before?
Looking for a Used Yukon in your area?
CarGurus has 23,483 nationwide Yukon listings starting at $1,750.
Search GMC Yukon Questions
GMC Yukon Experts
Related Models For Sale
Used Cars for Sale