One problem related to cruise control has been reported for the 2001 Chevrolet Silverado. The most recently reported issues are listed below.
Set cruise @ 67mph level ground (apporx 1900rpm) run for ~10-15 mins. Go up sufficient grade for cc to force downshift to next lower gear and increase in rpm to 3000+. Upon cresting hill and going down gradual downgrade the vehicle will upshift but the cruise control will reset its setpoint to ~ 4-5 mph greater than original. Subsequent hills will keep repeating until test terminated above 75mph. Repeatabiloity is variable based upon grades of subsequent inclines. First reset to +4 mph is consistent.