What does code P0509 mean?

Idle Air Control System Circuit High: The idle air control valve circuit is reading high.

P0509 is rated as medium severity. Schedule service — affects performance or emissions.

P0509

Idle Air Control System Circuit High

Powertrain Code · Medium

What does P0509 mean?

The idle air control valve circuit is reading high.

System: Idle Control

P0509 is a powertrain diagnostic trouble code indicating idle air control system circuit high. This code is classified as medium severity, which means: schedule service — affects performance or emissions.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.