P0505 – Idle Control System Malfunction

Description

The ECM detects a malfunction in the idle air control system.

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Symptoms

  • Rough idle
  • Stalling
  • High idle
  • Hesitation

Causes

  • Vacuum leaks
  • Dirty throttle body
  • Faulty IAC valve

Diagnosis

  • Inspect vacuum lines
  • Clean throttle body
  • Monitor idle control data

Repair

  • Fix vacuum leaks
  • Clean throttle body
  • Replace IAC valve