What Does P0586 Mean?
The ECM has detected an open circuit in the cruise control vent control solenoid circuit. The vent solenoid releases vacuum from the cruise control servo to allow the throttle to close. An open vent circuit means the ECM cannot command the servo to release, which is a critical deactivation path for the vacuum-operated cruise control system.
Common Causes
35%
Failed cruise control vent solenoid with open internal coil winding from heat exposure or age
30%
Open circuit in the wiring between the ECM and the cruise control vent solenoid
20%
Blown fuse or open relay in the vent solenoid power supply circuit
15%
Disconnected or corroded vent solenoid connector preventing electrical continuity
Diagnostic Steps
1
Step 1: Locate the cruise control vent solenoid (usually mounted near or on the cruise control servo/actuator assembly). Verify the connector is plugged in and not damaged.
2
Step 2: Disconnect the vent solenoid and measure coil resistance. A good solenoid typically reads 30-60 ohms. An open reading (OL/infinity) confirms a failed solenoid coil.
3
Step 3: Check for power supply voltage at the solenoid connector with key on. If no power, trace the supply circuit back through the fuse and relay.
4
Step 4: Verify the ECM control wire has continuity from the ECM connector to the solenoid connector. Check for opens at connectors and harness stress points.
5
Step 5: Apply 12V directly to the vent solenoid to verify mechanical operation (should click and allow air to flow through). Replace if coil is open or solenoid does not actuate. After repair, verify cruise control engages and disengages smoothly.
Estimated Repair Cost
$30 - $200
Parts + labor, varies by vehicle and location
The ECM has detected an open circuit in the cruise control vent control solenoid circuit. The vent solenoid releases vacuum from the cruise control servo to allow the throttle to close. An open vent circuit means the ECM cannot command the servo to release, which is a critical deactivation path for ...
The most common cause of P0586 (Cruise Control Vent Control Circuit / Open) is: Failed cruise control vent solenoid with open internal coil winding from heat exposure or age
Typical repair costs for P0586 range from $30 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
On normally-open vent solenoid designs, an open circuit keeps the vent open, which actually prevents cruise from maintaining vacuum. On normally-closed designs, cruise may not release properly. The ECM disables cruise when this fault is detected. The brake pedal provides a mechanical override regardless.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0586 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cruise Control System (Vacuum-Actuated)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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