Step by step guide to disable OnStar on a 2022 Chevy Bolt (this is reversible and not permanent)
Author: BiggRanger
Source: https://imgur.com/gallery/n00QKnH

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From Amazon order the following:
1x Z Female to SMA Female antenna cable
1x SMA male 50 ohm terminator

Assemble and use a small zip tie to package it nicely.

The terminator is necessary to completely block out the cellular signal, with the antenna unplugged OnStar did not connect at home, but while at work the OnStar light was sometimes green. With the terminator connected it is always red and disabled.

Note: disabling OnStar is in response to the write up from Mozilla here:
https://foundation.mozilla.org/en/privacynotincluded/articles/its-official-cars-are-the-worst-product-category-we-have-ever-reviewed-for-privacy/

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Open the glove box all the way, in order to do this the damper needs to be removed. Simply slide it to the right to disconnect it from the glove box.

Note: this is the right side of the glove box, when the glove box is opened.

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Glove box fully opened. After disconnecting the damper, the back sides need to be pressed inward to open like this.

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The OnStar module is behind the infotainment display, with a flashlight and cellphone camera you can see what it looks like. The purple and brown plugs are what we’re interested in. The purple plug is for the cellular antenna, and the brown plug is for the GPS antenna. We only need to unplug the closer purple plug.

Note: it is easier to access this connector with your hand between the rear of the dash and in front of the aluminum bar pictured in the left of this image (see next picture) this angle is best for pictures.

To unplug this connector you need a small screwdriver to slide the red lock backward. It only moves about 3MM or 1/8” (see in the picture after the next one to see what it look like), but one the lock is moved back the plug can be removed by pressing the top rear of the purple housing down and pulling back.

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Side view of OnStar module. This is where it is easier to reach into and access the connector.

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View with antenna terminator installed. I just let the cellular antenna connector hang out where I left it.

Note: the red locking tab is pulled back to allow the unlocking button to be pressed in.

To reverse the modification simple remove the terminator and reinstall the purple antenna connector.

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After turning on the car and driving around a bit OnStar is no longer connecting to its network (also be sure to disable the WiFi connection to your home too if you set that up). 

The GPS and compass work fine, so does the location feature for charging.
Making and receiving calls over Bluetooth works perfectly too.

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No OnStar, just a red light. I may disconnect the cable to the OnStar buttons in the future so I don't have to look at the red light, or I may not, it doesn't bother me.

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The compass is still working and there are no warning or error lights.