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P0588 OBD-II Trouble Code: Cruise Control Vent Control Circuit High

check engine light

P0588 code definition

The P0588 trouble code detects an issue with the cruise control vent control circuit.

What the P0588 code means

The P0588 code is a standard OBD-II trouble code that notes a problem with the cruise control vent control circuit. The cruise control system is controlled by both the powertrain control module (PCM), and the cruise control module, which work together to control the vehicle’s speed. The PCM can determine that the vehicle’s speed is not being controlled automatically, at which point the PCM will test the cruise control system in totality. If a voltage or resistance reading from the cruise control vent control circuit is determined to deviate from the manufacturer’s settings, then the P0588 code will be triggered.

What causes the P0588 code?

The P0588 trouble code can be caused be a few things, including:

  • Defective vent control solenoid
  • Damage to the cruise control buttons circuitry
  • Open, damaged, or shorted wires in the cruise control system
  • Corroded or damaged connectors in the cruise control system
  • Blown fuse in the cruise control system
  • Broken or cracked vacuum hoses or valves

What are the symptoms of the P0588 code?

When the P0588 trouble code is detected, the check engine soon Warning Light will likely illuminate on the dashboard, though this does not happen in all vehicles. The cruise control system will likely not be usable.

How does a mechanic diagnose the P0588 code?

A P0588 code should be diagnosed using a generic OBD-II trouble code scanner. A trained mechanic will use the scanner to view the freeze frame data and assess the P0588 code. They will also look for any additional trouble codes that may be present. The codes should then be reset, and the vehicle should be restarted and taken for a short test drive. If the codes do not return, they were triggered erroneously, or represent an intermittent issue.

If the P0588 code returns, then the technician should begin by visually inspecting the electrical components in the cruise control system. All of the fuses, wires, and connectors should be inspected for damage, and all malfunctioning components should be replaced.

Following this electrical inspection, the vent control solenoid should be inspected, as it is the most common cause for the P0588 code. After the solenoid, the vacuum hoses and valves should be checked, as well as the circuitry for the cruise control buttons.

Every time an error is noted and a component replaced, the codes should be reset, and the vehicle restarted, to see if they return. By doing this, a mechanic can tell exactly when the problem is resolved, and thus can avoid erroneous repairs.

Common mistakes when diagnosing the P0588 code

The most frequent mistake made in diagnosing the P0588 code comes from a failure to follow the standard OBD-II trouble code diagnosis protocol. The protocol should be adhered to at all times, to avoid unnecessary replacements, and to make sure that the process is both thorough and efficient.

It is common for blown fuses to be overlooked, and larger components replaced instead of simply replacing the fuse.

How serious is the P0588 code?

The presence of the P0588 code will not keep a car from being drivable. However, the cruise control system will not work in the vehicle, so the issue should be addressed sooner rather than later.

What repairs can fix the P0588 code?

Some repairs for the P0588 trouble code include:

Additional comments for consideration regarding the P0588 code

The P0588 trouble code only occurs in vehicles with electronic cruise control systems.

Need help with a P0588 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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