P0518

Idle Air Control Circuit Intermittent

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–89 (est.)

Symptoms

Unstable idle
Engine stalls at idle
Floating speed
Difficulty starting the engine

Causes

Open or poor contact in the IAC wiring harness
Idle air control malfunction
Throttle valve contamination
Problems with power or grounding of the IAC circuit

How to Fix

Check the wiring harness and IAC connectors for damage.
Clean the throttle valve and IAC channel
Check the performance of the IAC
Replace idle air control if necessary

Related codes

P0505 P0506 P0507