P0507 Idle Air Control System RPM Higher Than Expected

P0507 indicates idle speed is higher than expected. The engine is idling above the control module's target even though the module is trying to manage it.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not clear adaptive memory repeatedly without fixing the air or throttle cause; the high idle usually returns.

Symptoms of P0507

High or hanging idle speed.
A slow return to idle after lifting off the throttle.
Check-engine light.

Common causes of P0507

A vacuum or intake leak letting in unmetered air.
A dirty throttle body or a sticking throttle plate.
A failing idle-air-control valve where fitted.
A PCV or brake-booster leak.

Useful checks before replacing parts

Check for vacuum leaks, stuck throttle, dirty throttle body, PCV faults, intake duct leaks, and incorrect learned idle values.
Compare commanded idle, actual RPM, throttle angle, airflow, and fuel trims at warm idle.
Perform the correct idle relearn only after mechanical and air-leak causes are addressed.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.