P2503 – Charging System Voltage High

Description

The ECM detects excessive charging system voltage.

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Symptoms

  • Battery warning light
  • Burning smell
  • Electrical issues

Causes

  • Faulty voltage regulator
  • Alternator overcharging
  • Wiring short

Diagnosis

  • Test alternator regulator
  • Inspect wiring
  • Check battery

Repair

  • Replace alternator
  • Repair wiring

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