P0508 Code - Idle Air Control System Circuit Low

What Does P0508 Mean?

The Engine Control Module (ECM) controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed. The ECM calculates the actual engine speed from signals of crankshaft position sensor (POS) and camshaft position sensor.

The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily. The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warming up, deceleration, and engine load (air conditioner, power steering and cooling fan operation, etc.)

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What are the common causes of P0508 ?

• An air leak forward of the DPF will change the sensor readings resulting in the code
• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• Fuel with a large percentage of sulfur will clog the DPF quickly

How do you troubleshoot P0508 ?

The following are some of the repairs and methods used to fix the P0508 code.

• First, they will check to determine whether the P0508 code has been set by mistake
• If code is legitimate they will want to check the throttle body bore and clean, and then reset and check the code
• They will then want to check the electrical connections and circuits with the IAC to make sure they are in proper working order, and will make replacements for repairs to those connections as needed
• In some cases, they may need to replace the IAC
• They may need to replace the PCM, but this is extremely rare

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