steering assist reduced, fan running, engine temp to zero

What is your question?

My 2017 Acadia on several occasions has displayed a "Steering Assist Reduced" warning, the engine temperature does not register, and the radiator/ac fan runs wide open. I understand replacing the thermostat and/or temperature sensor is not the answer.

What makes this problem better or worse?

It usually happens after being on the road for about 5 minutes. After restarting the engine the next day everything returns to normal in a couple of minutes.

How long has your 2017 GMC Acadia had this problem?

A few weeks