Transmission Transfer Case System Concern Servicing Required
Table of contents
P1866 MERCURY Possible Causes
- Faulty Transfer Case Shift Motor
- Transfer Case Shift Motor harness is open or shorted
- Transfer Case Shift Motor circuit poor electrical connection
How do I fix code P1866 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1866 MERCURY code
The cost of diagnosing the P1866 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1866 MERCURY 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.