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

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2015 Lincoln Navigator, 2015 Lincoln MKZ, 2015 Lincoln MKX, 2015 Lincoln MKT, and 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.

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

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 .