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P1506 – Idle Air Control System Stuck Closed

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Symptoms

  • Low idle
  • Stalling
  • Rough idle

Causes

  • Carbon buildup
  • Valve failure
  • ECU issue

Diagnosis

  • Inspect IAC valve
  • Check throttle body
  • Scan ECU

Repair

  • Clean or replace IAC
  • Clean throttle body
  • Update ECU
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