Possible causes

– Faulty Cruise Control Multifunction Switch
– Cruise Control Multifunction Switch harness is open or shorted
– Cruise Control Multifunction Switch circuit poor electrical connection

When is the code detected?

The ECM has detected a multifunction switch A input error

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Cruise control system inoperative

P0579 Information for specific makes

P0579 FORD
P0579 CHRYSLER
P0579 DODGE
P0579 MAZDA