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Is your onstar light also red?

Look under the dash, far left side where the obd2 port is. The onstar box is there and it has a breakout you'll see the blue gps that goes to the radio/nav and pink? and maroon ( dont remember the colors ) cables that go to the onstar module. Check to see if any of those are loose. They are "kickable"

If you undo the screw above the obd2 port you can drop the module out and the antennae connectors there go to the onstar module and the gps receiver and back out to that splitter. Check those. Although I'd find it very difficult to remove or dislodge them.
 
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