No odometer/speedometer 2019 2500

[Forgot]

I just bought a 2019 Sierra 2500 about a week ago. Yesterday, the little screen in the cluster that shows the mileage (Lower trim style) went blank. I can see that it is backlit, but it's only showing black. Today the speedometer says I'm going about twice as fast as I am, and somehow my infotainment screen shows outdoor temp in C instead of F now.

 

I unhooked the battery and left it for an hour. Nothing. All the gauges do a full sweep when starting up like they should.

 

I never touched or changed any part of this system before unhooking the battery. It all worked before that. Any ideas? This is kind of an emergency because I have to get the odometer inspected to register it. There is no odometer to read!

[newdude]

Could be bad cluster or ground for the cluster.