I had that type of problem with my 2000 Tahoe.
The dealer had to change out the on-star unit.
But that was about 4 years ago.
Hope things work out for you!
Tim
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2005 White Hummer H2 Adventure, Tinted Windows, Hella Fog Lights, Piaa Driving Lights, Chrome Fuel Door, V1, Gobi Rack W/ Ladder and Chrome Steps.
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