P1502 – Alternator Low Output (Nissan)

Description

The ECM detected low alternator output voltage.

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Symptoms

  • Battery warning
  • Dim lights

Causes

  • Alternator failure
  • Belt slip
  • Wiring issue

Diagnosis

  • Measure output voltage
  • Inspect belt
  • Check wiring

Repair

  • Replace alternator
  • Repair wiring