Error code
OBD2 P0518
OBD2P0518
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Idle Air Control Circuit Intermittent.
Severity
moderateCan drive but may experience stalling or rough idling.
Summary
P0518 indicates an intermittent issue with the Idle Air Control (IAC) circuit, which helps regulate engine idle speed.
Common Causes
- Poor wiring connection
- Faulty IAC valve
- ECM malfunction
Fixes
FAQ
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P0500Vehicle Speed Sensor 'A'
- P0501Vehicle Speed Sensor 'A' Range/Performance
- P0502Vehicle Speed Sensor 'A' Circuit Low Input
- P0503Vehicle Speed Sensor 'A' Intermittent/Erratic/High
- P0504Brake Switch 'A'/'B' Correlation
- P0505Idle Air Control System
- P0506Idle Air Control System RPM Lower Than Expected
- P0507Idle Air Control System RPM Higher Than Expected
- P0508Idle Air Control System Circuit Low
- P0509Idle Air Control System Circuit High
- P0510Closed Throttle Position Switch
- P0511Idle Air Control Circuit