OBD-II Error Code P0518: How to Fix Idle Control Circuit Intermittent

Q: Can I drive with a P0518 code?

You can drive short distances, but the idle may be erratic or stall, posing a safety risk. It's best to fix it promptly.

Q: What does 'intermittent' mean in P0518?

It means the fault is not constant; it comes and goes. This often indicates a loose connection, damaged wire, or intermittent IAC valve failure.

Q: Will cleaning the IAC valve fix P0518?

Yes, in many cases carbon buildup causes the intermittent fault. Cleaning often resolves the issue if the valve is not mechanically damaged.

Q: How much does it cost to fix P0518?

DIY cost is around $10-30 for cleaner and maybe $50-150 for a new IAC valve. Mechanic labor can add $100-200.

Q: Is P0518 the same as P0505?

No. P0505 is an idle control system malfunction. P0518 specifically indicates an intermittent circuit issue in the IAC valve circuit.

Abstract

Error code P0518 means your car's engine control module (ECM) detected an intermittent fault in the idle air control (IAC) circuit. This can cause rough idle, stalling, or fluctuating RPM. The fix usually involves checking wiring, cleaning the IAC valve, or replacing it.