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P0506 - Idle Air Control (IAC) System Rpm Lower Than Expected

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P0506 - IDLE AIR CONTROL (IAC) SYSTEM RPM LOWER THAN EXPECTED

Description:  This DTC sets when the engine idle speed is less than the desired RPM.
Possible Causes: 
  • Intake air restriction
  • Vacuum leaks
  • Exhaust restriction
  • Engine mechanical concern
  • Sludged throttle body
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
Diagnostic Aids:  This DTC may be accompanied by other DTCs. Diagnose other DTCs first. If no other DTCs are present, inspect the intake air system for air restrictions, vacuum leaks, and damage. If no concerns are present, clear the DTC and carry out the key ON, engine running (KOER), self-test.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST HU: INTAKE AIR SYSTEMS .
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