All codes › P0505
P0505: Idle Air Control System
What it means
The idle air control system isn't controlling idle speed as expected.
Severity: Low–Medium Rough or stalling idle.
Common causes
- Dirty or failed IAC valve
- Carbon in throttle body
- Vacuum leak
- Wiring fault
Most common causes first. Exact causes vary by make, model and engine.
Can I fix it myself?
Often DIY. Clean the IAC valve and throttle body.
Repair cost
SEEDED ESTIMATE Roughly $90–$450
Most likely repair: idle air control valve. Diagnosis fees, taxes and other causes are not included.
| Line | Low | High | Basis |
|---|---|---|---|
| Idle air control valve | $36 | $289 | Typical listed retail range, source ($439–$639 outliers excluded) |
| Labor 0.5–1 hr | $50 | $160 | $100–$160/hr, shop survey |
⚠️ This is an editorial placeholder range for this type of repair. It is not based on real invoices or licensed pricing data yet. Real ranges will appear here once enough reader invoices for P0505 are verified.
Verified reader invoices for P0505: 0. Share your repair bill to help build real costs.
Tools that can read P0505
- ScanFixAI: Pro $29.99/mo or $249.99/yr
- OBDAI: Annual PRO bundle $299
- BlueDriver Pro Next-Gen: $119.95 list ($99.95 sale seen)
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