I WAS INFORMED THAT ON STAR DOES NOT OPERATE WITH CARS
OLDER THAT 2005. I DID NOT KNOW THIS WHEN I PURCHASED THE
VEHICLE. WHAT CAN BE DONE?....IS THERE ANOTHER ON STAR
SERVICEOR SOMETHING VERY SIMILAR FOR 2004 GMC ENVOYS?
https://www.hum.com/ - http://www.cargurus.com/Cars/Discussion-ds696829 -Personally I would not have it but maybe it will interest you. There is a lot if information at http://forums.trailvoy.com/archive/index.php/t-2609.html
Yes, there's a digital upgrade available for about $250. Talk with your local GMC dealer about the installation. HTH. -Jim
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