Centerfire,
The frequency of the remote transmitter is 433.7 mhz.
There should be no interference.
It is possible to get a harmonic (multiplication freq) at close range with enough transmit power. But, unless you are going to hold the transmitter up to the onstar antenna I don't believe you could create interference. Even then the transmit power of the remote is so low I don't think it would be a problem. The harmonic at x2 would be 867. or 868 and should not create a problem unless you were transmitting at 50 to 100 watts.
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