Diagnostic Trouble Code
P0506
Idle Air Control System RPM Lower Than Expected
Technical Description P0506
Idle Air Control (IAC) System RPM Lower Than Expected
What Does This Mean P0506?
This P0506 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle.
In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
Possible Causes P0506
1
A vacuum leak
2
An air restriction in the intake air path or exhuast
3
A faulty positive crankcase ventilation (PCV) valve
4
Damaged/failed/dirty throttle body
5
Internal engine problem
6
Failed PCM
Solutions & Repair Steps P0506
This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.