This is a picture of the rear bumper of a 2016 Chevy Colorado:

rear bumper picture

On the left is a harness for 4- and 7-pin trailer connectors. In the center is the license plate (blurred).

What is the circular connector on the right? If I pop open the cover I see the inside of a hollow tube with no wires that leads toward the front of the vehicle.

I searched through the truck's manual, paying close attention to the section on trailers and towing, but found no reference to this port.

What is the purpose of the round port on the right?

  • Where does the hollow tube go?
    – tlhIngan
    Nov 21, 2016 at 8:03
  • @tlhIngan I don't know, I could only follow it so far before it was covered by other stuff (like the spare tire).
    – user4896
    Nov 21, 2016 at 16:09
  • It's FOR the spare tire. See my answer bellow.
    – tlhIngan
    Nov 21, 2016 at 19:01

1 Answer 1


This is the access port for the tire iron so you can lower the spare tire from under the truck. Look at your Owner's Manual under "Vehicle Care," it will show you where on the truck to find your tire changing tool kit and how to use it to lower the spare tire.

  • 1
    I finally had time to confirm this. It was a hike through the owner's manual, too: there were at least four sections that mentioned the spare tire, but only one had the diagram showing the rod to unlock the spare tire via that port. Thanks!
    – user4896
    Nov 30, 2016 at 0:12

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