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