P0505Medium urgency
Idle Control System Malfunction
Engine · Idle Air Control
⚠️ Drive carefully — rough idle and stalling risk at stops.
What this means
The idle speed control system isn't maintaining proper idle RPM. You may notice rough idling, surging RPMs, or stalling when coming to a stop. The idle air control valve or throttle body are the most frequent culprits.
Likely causes
- Dirty or failed idle air control valveMost common
- Dirty throttle bodyMost common
- Vacuum leakCommon
Estimated repair cost
Throttle body cleaning$60 – $150
Idle air control valve replace$120 – $400
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Frequently asked questions
What does P0505 mean?
The idle speed control system isn't maintaining proper idle RPM. You may notice rough idling, surging RPMs, or stalling when coming to a stop. The idle air control valve or throttle body are the most frequent culprits.
Is P0505 serious?
Drive carefully — rough idle and stalling risk at stops.
How much does it cost to fix P0505?
Repair costs for P0505 range from $60 – $150 depending on the root cause and your vehicle.
Can I drive with P0505?
You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.