P0506

P0506: The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0506: Idle control system RPM lower than expected.

NOTE: If DTC P0511 is stored at the same time as DTC P0506, troubleshoot DTC P0511 first, then troubleshoot DTC P0506.

Possible Cause
- IAC valve mechanical malfunction
- Idle air control thermal valve malfunction
- Throttle body clogged port, improper adjustment
- Intake manifold gasket leakage
- Intake air hose loose or leaking
- Vacuum hoses leakage
- ECT sensor incorrect output

Part 1:

Part 2:

Troubleshooting Flowchart