P0506 Code - Idle Control System RPM Lower Than Expected

What Does P0506 Mean?

The purpose of the Idle Control System is to manage the engine idle speed to meet the ever-changing loads placed on the engine, such as the use of air conditioning, heater blower motor, wipers etc.
Code P0506 sets when the idle speed is persistently below a pre-determned RPM level for a specified amount of time.

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What are the common causes of P0506 ?

Depending on year, make, and model, DTC P0506 may have number of causes. Here are some of the most common.

• ECU Update – Newer vehicles, particularly those with drive-by-wire electronically-controlled throttle bodies, may not be equipped with an individual IAC, but use the main throttle valve to maintain idle speed. With or without an IAC valve, always check with the manufacturer for possible recalls, TSBs, or updates, that may address idle problems.
• Stuck IAC – The IAC valve is a sensitive valve, and the tiny motor or solenoid that operates it isn’t particularly strong. Over time, carbon deposits can obstruct the movement of the valve. Regular cleaning can prevent this, but very dirty valves may need to be replaced. Don’t forget to replace the gasket, if applicable, when replacing the valve.
• Stuck Throttle Valve – Similarly, carbon deposits can easily obstruct the movement of the throttle valve. Regular cleaning is recommended, and the throttle body is far more resilient than the IAC. Replacement isn’t usually required, but check with a professional for a firm diagnosis and possible TSB updates.

How do you troubleshoot P0506 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0506 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.



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