P0561 – System Voltage Unstable

Description

The ECM detects unstable or fluctuating system voltage.

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Symptoms

  • Battery light on
  • Stalling
  • Dim lights

Causes

  • Alternator failure
  • Loose battery terminals
  • Wiring issues

Diagnosis

  • Check charging voltage
  • Inspect battery connections
  • Test alternator

Repair

  • Replace alternator
  • Repair wiring
  • Tighten terminals

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