Diagnostic Trouble Code
P0506 — Idle Air Control System RPM Lower Than Expected
Idle Air Control System RPM Lower Than Expected
Definition
The engine idle speed is lower than the ECM's expected target RPM. The ECM is attempting to raise idle speed but cannot achieve the target.
Common Causes
- Dirty throttle body
- Vacuum leak
- Faulty idle air control (IAC) valve
- Carbon buildup on throttle plate
- Intake manifold gasket leak