P0584
UniversalCruise Control Vacuum Control Circuit High
Low SeverityThis code indicates that the Powertrain Control Module (PCM) has detected a higher-than-expected voltage or an open circuit in the cruise control vacuum control circuit. This malfunction typically prevents the cruise control system from engaging, making it inoperable.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely supported on a level surface before working underneath it. Disconnect the battery's negative terminal before performing any electrical repairs to prevent accidental shorts or injury.
Common Symptoms
- Check Engine Light illuminated
- Cruise control system inoperable
- Cruise control light may not illuminate
Common Causes
- Open or short to voltage in the cruise control vacuum control circuit wiring
- Faulty cruise control vacuum solenoid or actuator
- Damaged or disconnected vacuum lines for the cruise control system
- Defective cruise control switch
- Faulty Powertrain Control Module (PCM) (less common)
Frequently reported on: General/Universal
Diagnostic Steps
- Connect an OBD-II scanner to confirm the P0584 code and check for any other related codes.
- Visually inspect all vacuum lines connected to the cruise control system for cracks, breaks, or disconnections. Repair or replace as needed.
- Inspect the electrical connector and wiring for the cruise control vacuum solenoid or actuator. Look for corrosion, loose pins, or damaged insulation.
- Test the cruise control vacuum solenoid for proper operation using a multimeter to check resistance and apply voltage (if safe and directions are available).
- Check the functionality of the cruise control switch itself; sometimes a faulty switch can cause circuit issues.
- Clear the code and test drive the vehicle to see if the cruise control functions and the code returns.
👨🔧 When to Call a Professional
If you have checked all vacuum lines, electrical connections, and the cruise control switch, and the code persists, it's time to consult a professional mechanic. They have specialized diagnostic tools to test the PCM and internal cruise control module components.
Commonly Asked Questions
Can I drive with a P0584 code?
Yes, you can safely drive with a P0584 code as it only affects the cruise control system, which is a convenience feature.
What is the cruise control vacuum control circuit?
It's the electrical and vacuum pathway that controls the vacuum actuator responsible for opening and closing the throttle when cruise control is engaged in older systems.
Is it usually an expensive repair?
Not typically. Often, it's a simple fix like a disconnected vacuum line or a faulty vacuum solenoid, which are relatively inexpensive parts.
How do I test the vacuum system?
You can use a vacuum pump to check for leaks in the lines and actuator, and a multimeter to check the electrical integrity of the solenoid.
Could a blown fuse cause this code?
Yes, an open circuit caused by a blown fuse supplying power to the cruise control system's vacuum components could trigger this code. Check the fuses related to the cruise control.