Helpful Automotive Resources
P0505 Code: Idle Control SystemDiagnostic trouble code (DTC) P0505 stands for “Idle Control System.” The code may be accompanied by erratic idle speeds that can lead to stalling and other issues.
P0506: Idle Air Control System RPM Lower Than ExpectedThere are several OBD-II codes that could trigger if the idle control system malfunctions, one of which is code P0506.
If your PCM detects an engine idle speed lower than the specified revolution per minute (RPM) for a specific amount of time, it may set code P0506.
What Does the P0506 Code