P0593 Code - Speed Control Switch 2 Circuit High

What Does P0593 Mean?

The Engine Control Module (ECM) monitors the Speed Speed Control Switch 2. The ECM sets the OBDII code when the Speed Control Switch 2 is not to factory specifications.

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What are the common causes of P0593 ?

• 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.
• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

How do you troubleshoot P0593 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0593 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.

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