P1866 FORD – Transmission Transfer Case System Concern Servicing Required

P1866 FORD Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1866 FORD Possible Causes

Faulty Transfer Case Shift Motor,Transfer Case Shift Motor harness is open or shorted,Transfer Case Shift Motor circuit poor electrical connection

P1866 FORD Description

The Transmission Control Module (TCM) monitors the Transmission Transfer Case System. The TCM sets the OBDII code when the Transmission Transfer Case System is not to factory specifications.