CAN Message WFPDK (DKI) Invalid (FFh)

DTC P1884
CAN message WFPDK (DKI) invalid (FFh).

Possible cause:
^ Throttle position measurement fault present in engine management ECM.

Throttle position measurement fault present in engine management ECM.
CHECK THE FOLLOWING:
^ Read ECM fault codes and diagnose any throttle faults.
POSSIBLE FAULTS
^ Fault codes set in engine management ECM.