Idle Air Control Circuit
A general circuit fault is detected on the idle air control valve - open or short on supply, signal or ground. The ECU loses control of idle bypass airflow.
Affected components
- Idle air control valve
- Iac wiring
Common causes
- High likelihood: Open in valve or wiring
Possible symptoms
- Check engine light on
- Idle speed too high, too low, or unstable
- Possible stalling at idle or after cold start
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.