P2504 – Charging System Voltage Intermittent

Description

The ECM detects fluctuating charging system voltage.

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Symptoms

  • Flickering lights
  • Hesitation
  • Battery warning light

Causes

  • Loose wiring
  • Failing alternator
  • Bad regulator

Diagnosis

  • Inspect wiring
  • Test alternator output
  • Check regulator

Repair

  • Repair wiring
  • Replace alternator