P0579 Code - Cruise Control Multifunction Input 'A' Circuit Range/Performance

What Does P0579 Mean?

The Engine Control Module (ECM) monitors the Cruise Control Multi-Function Input 'A'. The ECM sets the OBDII code when the Cruise Control Multi-Function Input 'A' is not to factory specifications.

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codigo P0579	codigo falla P0579	P0579 kody b??dów	codigo de falla P0579

What are the common causes of P0579 ?

The most likely cause of this code setting condition is a failed cruise control switch. Shorted or open circuitry in the cruise control buttons is common due to the presence of spilled liquids. Liquid spilled onto cruise control components has proven problematic in the past. Other causes may include shorted or open wiring, damaged or corroded connectors, and blown fuses (although a blown fuse is usually a reaction to a more severe problem).



How do you troubleshoot P0579 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0579 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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