Error code
OBD2 P0506
OBD2P0506
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Idle Air Control System RPM Lower Than Expected.
Severity
moderateCan drive, but may experience erratic idle and hard starting.
Summary
P0506 indicates that the idle air control system is not maintaining the expected RPM during idle conditions. This issue typically affects the throttle body and related components.
Symptoms
- Engine idling unusually low
- Erratic engine idle speed
- Hard starting
Common Causes
- Stuck IAC valve due to carbon deposits
- Throttle valve obstruction or sticking
- Vacuum leaks in the intake system
- Defective PCV valve
Diagnosis
- Inspect the throttle body for carbon buildup or sticking.
- Check the IAC valve for proper connection and function.
- Look for vacuum leaks in intake hoses and connections.
- Verify PCV valve operation.
Fixes
- Clean or replace the IAC valve if necessary
- Inspect and clean the throttle body
FAQ
What should I do if my car has P0506?
Start by cleaning or replacing the IAC valve and inspecting the throttle body for carbon buildup. Also, check for vacuum leaks in the intake system.
Can a dirty throttle body cause this code?
Yes, carbon deposits on the throttle body can obstruct airflow and lead to improper idle control.
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
- 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
- P0512Starter Request Circuit