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DTC P0505: Idle Air Control (IAC) System

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
P0505 - IDLE AIR CONTROL (IAC) SYSTEM

Description:  The powertrain control module (PCM) attempts to control engine speed during the key on, engine running (KOER) self-test. The test fails when the desired RPM could not be reached or controlled during the self-test.
Possible Causes: 
  • Failure mode effects management (FMEM) condition is present
  • Intake air restriction
  • Exhaust restriction
  • Sludged throttle body
  • Vacuum leaks
  • Damaged electronic throttle body (ETB)
  • Damaged PCM
Diagnostic Aids:  This DTC may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not 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 KOER self-test.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST A .
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