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P1858 – Transfer Case Shift Motor Relay Stuck

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Symptoms

  • 4WD not engaging
  • Incorrect mode

Causes

  • Relay stuck
  • Wiring short
  • Mechanical jam

Diagnosis

  • Test relay
  • Inspect wiring
  • Check linkage

Repair

  • Replace relay
  • Repair wiring
  • Fix linkage
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