Cruise Control

I just bought a 05 Envoy and notice that the cruise control will not work over 70 mph. It will engage and hold at 65 or under. It will engage under 70 the release if it creeps up to 70 when going down hill. I have the I6 with 82k on her. Is this normal? Can you change the program to allow a higher disengage point?

Not normal, a scan to look at pcm, bcm parameters will be needed to properly track this down. It has an electronic throttle control, no cables.