P2502 – Charging System Voltage Low

Description

The ECM detects insufficient charging system voltage.

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Symptoms

  • Battery warning light
  • Dim lights
  • Engine stalls

Causes

  • Weak alternator
  • Loose belt
  • Wiring faults

Diagnosis

  • Check alternator voltage
  • Inspect belt tension
  • Test battery

Repair

  • Replace alternator
  • Tighten belt
  • Repair wiring