Wrench light came on stayed on driving on snow. on 2008 Ford Fusion

had the car since Aug 2008. Driving into work this morning
the wrench light came on, stayed on.Driving home no problem.
This has never happened before.

Asked by for the 2008 Ford Fusion
The wrench light indicates an issue with either the transmission controls or all wheel drive controls, if you have them. A diagnosis must be performed to determine what is at fault.