P0505
Idle Air Control System Malfunction
Low — drive on, check soonPowertrain (engine & transmission)
System
Powertrain (engine & transmission)
Type
Generic (standardized)
Subsystem
Vehicle speed, idle control & auxiliary inputs
What it means
The system that controls idle speed is not maintaining the target RPM.
Symptoms
Stalling, high or fluctuating idle, rough idle.
Common causes
Dirty/faulty idle air control valve, carbon in the throttle body, or a vacuum leak.
Recommended action
Clean the throttle body and IAC valve; check for vacuum leaks.
Related codes
P0300Random/Multiple Cylinder Misfire DetectedP0301Cylinder 1 Misfire DetectedP0302Cylinder 2 Misfire DetectedP0303Cylinder 3 Misfire DetectedP0304Cylinder 4 Misfire DetectedP0420Catalyst System Efficiency Below Threshold (Bank 1)P0430Catalyst System Efficiency Below Threshold (Bank 2)P0171System Too Lean (Bank 1)P0174System Too Lean (Bank 2)P0172System Too Rich (Bank 1)P0175System Too Rich (Bank 2)P0101Mass Air Flow (MAF) Circuit Range/Performance
FAQ — P0505
What does code P0505 mean?
Idle Air Control System Malfunction. The system that controls idle speed is not maintaining the target RPM.
What are the symptoms of P0505?
Stalling, high or fluctuating idle, rough idle.
What causes P0505?
Dirty/faulty idle air control valve, carbon in the throttle body, or a vacuum leak.
What should I do about P0505?
Clean the throttle body and IAC valve; check for vacuum leaks.
General reference based on the SAE J2012 standard. Exact causes for your vehicle may differ — when in doubt, consult a workshop.
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