Open circuit or high resistance in the wiring to the vent solenoid or valve; Corroded, loose or damaged connector at the vent solenoid or servo; Faulty vent solenoid or cruise control servo with an open coil; Blown fuse or a loss of power supply to the cruise control circuit; Faulty brake or clutch switch circuit affecting the cruise control release path; Fault inside the engine control unit or cruise control module driver.

P0586

Cruise Control Vent Control Circuit/Open.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
86: FaultThe specific fault in that area

What it means

P0586 is the generic SAE J2012 code for an open circuit in the cruise control vent control circuit. The engine control unit monitors the circuit that drives the vent solenoid in vacuum-operated cruise control systems and has detected an open circuit, so the commanded state does not match the electrical feedback. Not every vehicle uses a vacuum-actuated cruise system, so the layout depends on the model and engine.

Symptoms

Cruise control will not engage or drops out unexpectedly
Cruise control cannot be set or resumed
Engine management warning light on
Cruise control indicator flashing or not lighting
Cruise control not releasing smoothly when the brake is pressed

Possible causes

Open circuit or high resistance in the wiring to the vent solenoid or valvelikely
Corroded, loose or damaged connector at the vent solenoid or servolikely
Faulty vent solenoid or cruise control servo with an open coillikely
Blown fuse or a loss of power supply to the cruise control circuitpossible
Faulty brake or clutch switch circuit affecting the cruise control release pathpossible
Fault inside the engine control unit or cruise control module driverrare

How to diagnose

Read all stored codes and freeze frame data, and note any other cruise control, brake switch or circuit codes
Check the relevant fuse and power supply to the cruise control circuit using the wiring diagram for the specific model
Inspect the wiring and connectors to the vent solenoid or servo for chafing, corrosion, pushed-out pins and water ingress
Check the vacuum hoses and servo for splits or disconnection, as the layout varies by vehicle
Measure the solenoid coil resistance and compare it with the manufacturer's specification
With the connector unplugged, check the wiring for continuity end to end and for shorts to earth or supply
Check the supply and control signal at the connector while operating the cruise control, using a scan tool's active test if supported
Clear the code and road test to confirm whether it returns

How to fix

Repair or replace damaged wiring and fix any open circuit found
Clean, repair or replace corroded or damaged connectors and terminals
Replace the faulty vent solenoid or cruise control servo
Replace the blown fuse after finding and correcting the cause of the failure
Repair or replace faulty brake or clutch switch wiring or components if they are implicated
Replace or repair the control unit only after all wiring and component checks have been completed

Can I keep driving?

Low severity

The car is generally fine to drive as this fault mainly affects cruise control, which may be unavailable. Book it in for repair, and take extra care if the brake or other warnings also appear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.