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P1632 – Smart Alternator Control Fault

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Symptoms

  • Battery light
  • Dimming lights

Causes

  • Wiring issue
  • Alternator fault
  • ECU issue

Diagnosis

  • Measure charging voltage
  • Inspect wiring
  • Scan ECU

Repair

  • Replace alternator
  • Repair wiring
  • Update ECU
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