The idle air control valve is not regulating idle speed properly.
Informational only. Consult a qualified mechanic.
Clean or replace the idle air control valve.
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.
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