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P0505 — Idle Air Control System Malfunction

Idle speed control system not maintaining proper idle RPM.

Severity: MediumRepair: $50-$400Difficulty: Easy

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Common symptoms of P0505

Common causes of P0505

Repair cost & difficulty

Typical cost to fix P0505: $50-$400 · Difficulty: Easy

Pro tip: Clean throttle body and IAC valve first. After cleaning, you may need an idle relearn procedure.

Vehicles commonly affected

All makes — more common on older vehicles

Related trouble codes

P0506P0507

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.