P1002 – Ignition Switch Interruption Detected (Ford)

Description

P1002 Ford indicates that the PCM detected an ignition power interruption during engine operation. This can cause intermittent resets and unstable electrical behavior.

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Symptoms

  • Instrument cluster resets
  • Engine may stumble
  • Lights flicker

Causes

  • Faulty ignition switch
  • Loose connectors
  • Poor ground
  • Charging system issues

Diagnosis

  • Check battery and alternator
  • Inspect ignition switch circuit
  • Verify grounds

Repair

  • Replace ignition switch
  • Repair wiring
  • Correct charging system faults

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