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P0505 - Idle Air Control (IAC) System - DTC Chart

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P0505 - IDLE AIR CONTROL (IAC) SYSTEM - DTC CHART

Description:  This DTC sets when the desired RPM could not be reached or controlled during the key ON, engine running (KOER), 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 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 KOER, self-test.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test HU .
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