P1787 – Shift Solenoid Mechanical Failure (Ford)

Description

P1787 Ford indicates a mechanical failure in a shift solenoid.

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Symptoms

  • Harsh shifting
  • Delayed shifting
  • Limp mode

Causes

  • Stuck solenoid
  • Broken solenoid
  • Valve body issue

Diagnosis

  • Test solenoid movement
  • Inspect valve body
  • Check pressure

Repair

  • Replace solenoid
  • Repair valve body
  • Fix pressure faults