Cruise Control problems of the 2004 Chevrolet Tahoe

After coming off cruise control at 55 mph and proceeding through town, I hit the resume button to once again increase speed from 45 mph to 55 mph but while on a road with a slight incline (less than 5% grade. ) after pressing and quickly releasing the resume button as I normally do, the cruise control accelerated unintentionally and proceeded to increase speed to over 101 mph before I disengaged it. This has happened at least 3 times on this vehicle and in the past I always would disengage it immediately but seeing as how I was on an open road I figured I would see if it would disengage itself. When I felt I was going way too fast to talk a policeman out of a ticket and actually didn't feel safe any longer I disengaged the cruise control after figuring that it wasn't going to disengage itself until the speed limiter was reached. This vehicle has 54000 miles on it and the only thing that has been done on it was the dash was replaced under a recall when the speedometer went to malfunctioning. I have called gm and reported this but they have indicated they have never heard of this problem in the past. I use the cruise control in probably about 80% of my driving and this has happened on 3 occasions (all with my family in the car) and on longer trips (after driving for more than 1 hour) in excess of 75 miles.

The contact stated while driving his 2004 Chevrolet Tahoe at 70 mph and using the cruise control and after he coming to a complete stop, the speedometer read 48 mph. While accelerating the speedometer increased to 120 mph and was inconsistent with the speed he was driving. The contact has an appointment scheduled for repair.

2004 Chevrolet Tahoe . Speedometer sticks at 70 mph, then decreases to 40 mph and ultimitely falls to 0 mph even thoughthe cruise control is set at 70 mph. Other times the speedometer works fine for a while until the vehicle slows down, then it drops to 0mph, although the vehicle is moving. Ak.