P0620 – Generator Control Circuit

Description

The generator/alternator control circuit is malfunctioning.

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Symptoms

  • Dim lights
  • Battery warning
  • Slow cranking
  • Poor acceleration
  • Check engine light

Causes

  • Faulty alternator
  • Weak battery
  • Damaged wiring
  • Loose connections
  • ECU issue

Diagnosis

  • Test alternator
  • Test battery
  • Inspect wiring
  • Check grounds
  • Scan live data

Repair

  • Replace alternator
  • Replace battery
  • Repair wiring
  • Fix grounds
  • Update ECU