My 2008 Avalanche came with XM radio, but I want to remove it and install a new Sirius radio. When contacting Sirius they recommended to purchase a SIR-GM1, so I did.... Now I am installing the unit but it is not working. The Sirius tech support is now stating that the SIR-GM1 is not compatible with a 2008 Chevy Avalanche.
Has anyone had this problem?
Thanks

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