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  1. #1

    Default Sirius radio doesn't show up

    I have a 07 avalanche LT. It has the satellite radio antenna on the top. But when I try to get in on the radio all that I have is FM AM and Aux. is there a way to check to see if it is hooked up?

  2. #2


    Around '05, or '06, GM combined the OnStar antenna and the XM antenna. However, this may not mean that XM is included. I tried to find the RPO code for XM installed, but there are so many I gave up. Most GM radios use a separate receiver for XM, it is a small module mounted behind the dash and plugged into the radio. I wish I had the RPO code, we could tell if you have the module.

    Here is a link to a module on e-bay:

    EDIT: found it.

    XM radio is: U2K

    XM radio delete is: U2J

    Look on the glove box door, the complete list of RPO codes is there, let us know if either of the above is in the list.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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