P0519

Idle Air Control System Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–111 (est.)

Symptoms

Unstable idle
Floating speed
Engine stalls at idle
High or low idle speed

Causes

Idle air valve is dirty or faulty
Problems with the IAC wiring harness or connectors
Throttle Position Sensor Malfunction
Air leaks in the intake tract
ECU software error

How to Fix

Check the condition of the idle air valve, clean or replace if necessary
Check the integrity of the wiring harness and contacts of the IAC system
Check throttle position sensor
Check the intake tract for air leaks
Reset the error and check if it returns

Related codes

P0505 P0506 P0507