We recently added Sirius to our 2006 Suburban 2500 LT. It worked fine for a couple weeks, then disappeared the other day. Now the radio cycles through AM, FM1 and FM2 but no longer shows sat as an option. The vehicle is an LT with the optional OEM XM/NAV radio head unit.

 

Welcome from Florida. Try this, disconnect the negative battery cable for ten minutes, reconnect and see what happens. If that doesn't work call serius radio and see if they can connect to your radio.

 

Thanks - will try that. Sirius can't reflash unless I set the radio to Sat....which doesn't show.