P0586 Cruise Control Vent Control Circuit/Open

P0586 indicates an open cruise control vent control circuit. The controller does not see expected continuity or response from the vent solenoid path.

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 adjust cruise linkage or replace the servo before the vent control circuit is tested.

Symptoms of P0586

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 P0586

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

Check vent control command, supply voltage, control continuity, solenoid resistance, cruise servo vacuum release, and freeze-frame data.
Inspect vent solenoid wiring, connector condition, fuse feed, grounds, vacuum hose routing, servo diaphragm, and harness damage.
Command the vent circuit and confirm the solenoid releases vacuum as expected.

Related OBD-II codes

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