CAN Message T_MOT (Engine Temp) Invalid (FFh)

DTC P1884
CAN message T_MOT (Engine temp) invalid (FFh).

Possible causes:
- Engine coolant temperature fault present in engine management ECM.

Engine coolant temperature fault present in engine management ECM.
CHECK THE FOLLOWING:
- Read ECM fault codes and diagnose any temperature measurement faults.
POSSIBLE FAULTS
- Fault codes set in engine management ECM.