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Diagnose/P0506
P0506Low SeverityEngine

Idle Air Control System RPM Lower Than Expected

What This Means

The idle air control (IAC) system readings are outside expected range. The IAC valve regulates the amount of air bypassing the throttle plate to control engine idle speed.

Common Symptoms

  • Erratic idle speed
  • Engine stalling at idle
  • Idle speed too high or too low
  • Rough idle especially when cold

Common Causes

  • Carbon-clogged IAC valve
  • Faulty IAC valve motor
  • Vacuum leak
  • Dirty throttle body
  • Wiring issue to IAC valve

Estimated Repair Cost

$50 – $400
Parts and labor (varies by vehicle and location)
Difficulty:Easy

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.