DTC P0506 refers to the actual engine idle speed not being within range of the commanded engine idle speed. If there are any other DTCs present those must be fixed first.
This can be caused by an ISC (Idle Speed Control) motor sticking.
Other possible causes of this code are:
- incorrect TCC (Torque Converter Clutch) operation
-accessories that require additional engine torque to operate - including amplifiers, security systems, etc. that can cause additional electrical load.
- Restricted exhaust system
-any other mechanical problem that may affect engine speed.
This is an idle valve from gm may be yours is little diferent that code is from the idling is too low wen you turn the ac on ... the engine idle low
A P0506 DTC trouble code may be caused by a
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