There are way too many causes to make a guess, from a bad fuse to a broken servo. Take it to your Chevy garage.
A Chevrolet Silverado that has cruise control problems might be having a problem with the part of the engine that controls speed and fuel intake. One culprit for this problem is the Speed Control Sensor that is located in the transmission. This part can be easily changed because it is more or less a probe that fits into the rear of the transmission.
cruise control does not work on 98 astro van
There is a simple way to get past the governor, just as your going top speed hold in your round cruise control button and it will bypass the governor.
BROKEN CRUISE CONTROL CABLE (CHECK AT THROTTLEBODY AND FOLLOW TO TRANSMISSION)
There is no kick down cable on a 2002 Silverado. You TCM (transmission control module) controlls downshifts. Also, the cruise control, has a module that does it's thinking and is non-ajustable.
Mine gets 17+ in town and 20.8 - 22.3 with cruise set at 60 mph on highway
There are multiple things that can go wrong with the cruise control, you need to be more specific as to the problem your car is having. While traveling at highway speeds, the cruise control suddenly deactivated itself and would not come back on.
There are many aftermarket kits available with everything you need including instructions. Just Google "aftermarket cruise control kits for Chevy".
GM P0833 is a failed clutch switch, or the circuit for it--- the one that must make contact or the truck won't start, and sometimes lose cruise control. The switch is under the pedal and cost under $10
Try this site, they sell newer oem crusie control kits. http://www.oem-auto-accessory.com
Depending on the age and model of the vehicle you have, the fuse which is associated with Cruise Control will either specifically say 'Cruise Control.' Other associations, such as with Ford, Chevrolet, and General Motors, the fuse box may say: "Ancillary" "Accessories" "Drive" finally, if the Cruise Control has been added after leaving the assembly plant, the Cruise Control power source may be connected to "Clock" "Display" and even "Radio." European makes may require direct reference to the vehicle manual for specific numerals.
Well this problem can be fixed by simply taking the vehicle back to the dealer.On May 1,1995 there was a recall on the control system for this vehicle.