One problem related to cruise control has been reported for the 2009 Chevrolet Silverado 1500.
I have a 2009 Chevrolet Silverado 1500. The cruise contol does not slow down the vehicle on grades or ever small slopes. The vehicle free rolls as fast as you will let it in over drive, 3rd gear, 1st or 2nd. There is no engine breaking at all. Gm says this is proper operation for the vehicle, and there is no software or mechanical fix for this problem. I have a 2004 of the same model and it works perfectly, with very effective speed control. This is very unsafe, and actually in my opinion cannot be considered to be cruise control at all. My dealership told me this is an ongoing complaint, that gm will not acknowledge as a definite defect in design. The same day my vehicle was being examined, the local police had one of their trucks of the same model year in the shop with the same complaint. I have not had an accident, but cannot use this option on the vehicle, I can only ride my breaks down slopes to slow the vehicle down.