My speedometer is stuck at 38mph how can I get it unstuck, on 2004 Chevrolet Silverado 2500 HD

is there something I can do to reset the speedometer?

yes, you can have the instrument cluster replaced.
Well this is what I did, I started the engine put the transmission into first gear and turned off the engine and placed the transmission in Park. I restarted the engine and whala the gauges worked just fine and has done so for the last 24 hours. My brother in laws son is a certified gm mechanic and he told me to try that, and it worked. Thanks for your help.
1 more answer
most likely the cluster is bad very common on gm veh approx cost is 450.00