Idle Air Control System
The idle air control valve is not regulating idle speed properly.
Informational only. Consult a qualified mechanic.
- Dirty IAC valve
- Carbon buildup
- Vacuum leak
- Faulty IAC valve
Clean or replace the idle air control valve.
What does P0505 mean?
The P0505 OBD-II diagnostic trouble code (DTC) indicates: idle air control system. This is a medium-severity powertrain code that your vehicle's onboard diagnostics system triggers when the idle air control valve is not regulating idle speed properly. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
Use Your Service Book to log this diagnostic trouble code to your vehicle's service history, track repairs, and get maintenance reminders — all for free.
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