P0565 Cruise Control On Signal Malfunction

P0565 points to a cruise control on signal malfunction. The controller is not seeing the expected on request from the cruise switch or related 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 the servo or throttle actuator first when the cruise on request itself is missing.

Symptoms of P0565

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 P0565

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

Review cruise on switch state, multi-function switch data, brake and clutch inputs, vehicle speed, cruise enable status, and freeze-frame data.
Inspect switch contacts, steering wheel wiring, clockspring circuits, connector fit, shared reference circuits, and corrosion or liquid intrusion.
Press the cruise on control while monitoring live data to confirm whether the request reaches the controller.

Related OBD-II codes

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