P1858 MERCURY - Transmission Transfer Case Contact Plate 'D' Circuit Failure
- Faulty Transfer Case Shift Motor
- Transfer Case Shift Motor harness is open or shorted
- Transfer Case Shift Motor circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1858 Mercury DescriptionThe Transmission Control Module (TCM) monitors the Transmission Transfer Case Contact Plate 'D'. The TCM sets the OBDII code when the Transmission Transfer Case Contact Plate 'D' is not to factory specifications.
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