P0506 Idle Air Control System RPM Lower Than Expected

Description and meaning of DTC p0506

This P0506 code is one that's sometimes triggered on vehicles that have electronicthrottle control. That is, they don't have a regular throttle cable from theaccelerator pedal to the engine. They rely on sensors and electronics to controlthe throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggeredwhen the PCM (powertrain control module) detects an engine idle speed that islower than the desired (pre-programmed) RPM.

p0506 diagnostic trouble code symptoms

Most likely the only thing you'll notice is the idle speed is lower than normalso it will likely be rougher. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp,a. k. a. the check engine light) illuminates.

DTC p0506 - possible causes

A P0506 DTC trouble code may be caused by one or more of the following: A vacuum leak An air restriction in the intake air path or exhuastA faulty positive crankcase ventilation (PCV) valveDamaged/failed/dirty throttle bodyInternal engine problemFailed PCM

How to fix OBD-II diagnostic trouble code p0506

This DTC is more of an informational code, so if there are any other codesset, 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. Other related DTCs: P0505, P0507

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