P0568 Cruise Control Set Signal Malfunction

P0568 indicates a cruise control set signal malfunction. The controller is not receiving a valid set request from the cruise switch input circuit.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not diagnose speed control output components before confirming the set signal reaches the controller.

Symptoms of P0568

Unstable, high, or low idle, or stalling.
Erratic speedometer, cruise-control, or shift behaviour.
Check-engine light with a hesitation or surge.

Common causes of P0568

A dirty throttle body, idle-control valve, or throttle-position sensor.
A failing vehicle-speed or wheel-speed sensor, or its wiring.
Vacuum leaks or a related sensor forcing the idle/speed strategy.

Useful checks before replacing parts

Compare set switch state, resume and coast inputs, brake switch data, vehicle speed, cruise enable status, and freeze-frame conditions.
Inspect steering wheel switch contacts, clockspring wiring, column connectors, shared resistor circuits, corrosion, and liquid intrusion.
Press the set control while monitoring live data to verify the request changes correctly and is not stuck or missing.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.