P0586 OBD-II Trouble Code: Cruise Control Vent Control Circuit/Open

Check Engine Light

P0586 code definition

The P0586 trouble code notes an electrical fault in the cruise control vent control circuit

What the P0586 code means

The P0586 code is a basic OBD-II trouble code that detects an issue with the cruise control vent control circuit. The cruise control system is controlled by the cruise control module and the powertrain control module (PCM), which work together to allow the vehicle speed to be controlled automatically. If the vehicle speed is not able to be controlled, then the PCM will test the entire cruise control system for errors. If that test yields irregular voltage and resistance signals from the cruise control vent circuit, then the P0586 trouble code will be detected.

What causes the P0586 code?

The P0586 trouble code is usually the result of:

  • Damaged electrical components in the cruise control system.

  • Malfunctioning cruise control switch, which is likely the cause of a liquid spill in the vehicle’s interior.

What are the symptoms of the P0586 code?

In some vehicles, the P0586 trouble code will be accompanied by the check engine soon Warning Light illuminating on the dashboard. It is likely that the cruise control system will not function.

How does a mechanic diagnose the P0586 code?

The P0586 code will be diagnosed using a standard OBD-II trouble code scanner. A trained technician will use the scanner to observe the code’s freeze frame data, and to look for any additional trouble codes that are present. If the mechanic observes multiple trouble codes, they will need to be addressed in the order in which the scanner displays them. The mechanic will then need to reset the trouble codes, restart the vehicle, and check to see if the P0586 code remains detected. If the code has disappeared, then it was probably triggered erroneously, or represents an intermittent error.

If the code is still detected, then a visual inspection should be performed on the electrical components in the cruise control system. Any blown fuses, shorted or damaged wires, or open or corroded connectors should be replaced. Special attention should be paid to fuses, which are commonly found with the P0586 code, both as a cause and a reaction.

If the electrical components are in working order, it should be assumed that the cruise control switch is the issue. If a switch replacement does not solve the problem, then a deeper inspection of the cruise control system, cruise control module, and PCM will be required.

After any component is replaced, the trouble codes will need to once more be reset, the vehicle again restarted, and the trouble codes checked. By doing this, a mechanic is able to tell as soon as a repair has successfully identified and solved the issue.

Common mistakes when diagnosing the P0586 code

The most commonly made mistake when diagnosing the P0586 code comes from failing to properly adhere to the OBD-II diagnosis protocol. Mechanics should abide by the protocol at all times, step by step. Doing so ensures that all inspections and repairs are efficient and timely.

It is fairly common for blown fuses to be overlooked, and more complex components erroneously replaced as a result.

How serious is the P0586 code?

A car that is experiencing the P0586 trouble code will still be drivable. However, the cruise control system will likely not work, so the code should be addressed sooner rather than later.

What repairs can fix the P0586 code?

The most common repairs for the P0586 trouble code are:

Additional comments for consideration regarding the P0586 code

In many vehicles, the issue will need to be identified at least three times before the check engine soon Warning Light is illuminated.

Need help with a P0586 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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