Possible causes

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

When is the code detected?

The Engine Control Module (ECM) has detected a fault in the cruise control off switch circuit

Symptoms

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

P0566 HYUNDAI Description

The cruise control system keeps the vehicle running at a fixed speed until a signal canceling this fixed speed is received. When the main switch is turned on with vehicle in the running mode, the battery voltage is applied to the Engine Control Module (ECM). When a signal from the control switch is input to the ECM while the vehicle is in state, the ECM controls fuel injection to make a car go at a steady speed you want. Also, while the system is operating, “CRUISE” indicator lamp in the meter assembly lights up.