OBD2 Error Code P0505: How to Fix It

Q: What causes OBD2 error code P0505?

P0505 is typically caused by a faulty idle air control valve, dirty throttle body, vacuum leaks in the intake system, or wiring issues in the IAC circuit. Carbon buildup and electrical connection problems are the most common culprits.

Q: Can I drive with error code P0505?

While you may be able to drive short distances, P0505 can cause dangerous stalling at intersections or when coming to stops. It's recommended to address this issue promptly to avoid safety risks and potential engine damage.

Q: How much does it cost to fix P0505?

DIY repairs typically cost $50-150 for parts like IAC valve and cleaning supplies. Professional repair can range from $200-600 depending on the root cause, with IAC valve replacement being the most common solution.

Q: Will P0505 clear itself?

P0505 will not clear itself as it indicates an active system malfunction. The code will remain until the underlying problem is fixed and the code is manually cleared with an OBD2 scanner.

Q: What is an idle air control valve?

The idle air control valve regulates the amount of air entering the engine when the throttle is closed, maintaining proper idle speed. It's controlled by the engine computer and adjusts airflow based on engine load and temperature.

Abstract

Error code P0505 indicates a malfunction in your vehicle's idle air control (IAC) system, which regulates engine idle speed. This error can cause rough idling, stalling, or irregular engine RPMs when the car is stopped.