The transmission speed sensor is often the cause of this code but much testing would need to be done to be sure.
P1574 ASCD Vehicle Speed Sensor Signal Malfunction
CAN communication connector is damaged (check pins for damage)
CAN communication line is open, shorted to voltage or to ground
Combination Meter VSS circuit is open or shorted to ground
Combination Meter has failed
Vehicle Speed sensor has failed
Pic below, its not a real good pic but its better than I can describe it. It is called a vehicle speed sensor in the pic, in the bottom middle pic.