P0519 - Idle Air Control System Performance

The ECM detected idle air control performance outside the expected range.

Code Overview

The ECM detected idle air control performance outside the expected range.

Common Causes

• Idle control valve or throttle body problem
• Vacuum leak or unmetered air leak
• Wiring, connector, or control issue

Diagnostic Steps

1. Inspect the throttle body and idle passages for buildup
2. Check for vacuum leaks that affect idle speed
3. Compare commanded idle to actual idle behavior on the scan tool

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.