Diagnostic Trouble Code
P0584
Cruise Control Vacuum Control Circuit High
Technical Description P0584
Cruise Control Vacuum Control Circuit High
Severity Level P0584
To be honest, this fault shouldn't be much of a concern, safety-wise. With that said, severity is set to low-medium. Any problem within a vacuum system, which is a lot of times supplied/recycled by the engine, should be addressed sooner rather than later, given some of the possible consequences of neglecting to fix a vacuum system.
I'd say, if you've specifically determined that the engine is not affected by this fault, usually in non intake-supplied vacuum systems, and you can live without cruise control, you should be alright to stall this fault if your budget is limited or other things are of higher priority.
What Does This Mean P0584?
This is a generic powertrain diagnostic trouble code (DTC) and typically applies to OBD-II vehicles. Vehicle makes may include but aren't limited to Dodge, Chrysler, Jeep, Chevy, Hyundai, Ram, Ford, etc.
There are numerous possible ways your vehicle goes about controlling your cruise control system. One of the avenues manufacturers tend to use to control the cruise control, is a vacuum controlled and operated system.
Most times, they use vacuum as an efficient way of controlling a cruise control servo or a similar diaphragm-type control. The vacuum control circuit is integral to the proper operation of this system. The ECM (Engine control module) monitors/adjusts the vacuum control side accordingly, depending on the operator's cruise control demands. If the ECM loses it's monitoring capabilities to the cruise control vacuum control circuit, it will most likely cause your cruise control to stop functioning as it should. A lot of times, these systems will include a vacuum solenoid, which is in charge of controlling the vacuum flow to the control side of the system (i.e. it controls the speed of the vehicle, when cruise is active), that said, in other systems, the vacuum responsibilities are consolidated to solely the cruise control servo. As with many faults, this could be strictly an electrical issue caused by a mechanical issue, vice versa or both.
While monitoring your cruise control sensors, circuits, switches, etc., not to mention all the other systems in your vehicle, the ECM has detected a fault within the cruise control vacuum control circuit. Most likely one or more of the electrical values being monitored has gone out of range (i.e. beyond manufacturer specific-desired values).
For P0584, it indicates a high voltage situation from within the cruise control vacuum electrical circuit.
There are numerous possible ways your vehicle goes about controlling your cruise control system. One of the avenues manufacturers tend to use to control the cruise control, is a vacuum controlled and operated system.
Most times, they use vacuum as an efficient way of controlling a cruise control servo or a similar diaphragm-type control. The vacuum control circuit is integral to the proper operation of this system. The ECM (Engine control module) monitors/adjusts the vacuum control side accordingly, depending on the operator's cruise control demands. If the ECM loses it's monitoring capabilities to the cruise control vacuum control circuit, it will most likely cause your cruise control to stop functioning as it should. A lot of times, these systems will include a vacuum solenoid, which is in charge of controlling the vacuum flow to the control side of the system (i.e. it controls the speed of the vehicle, when cruise is active), that said, in other systems, the vacuum responsibilities are consolidated to solely the cruise control servo. As with many faults, this could be strictly an electrical issue caused by a mechanical issue, vice versa or both.
While monitoring your cruise control sensors, circuits, switches, etc., not to mention all the other systems in your vehicle, the ECM has detected a fault within the cruise control vacuum control circuit. Most likely one or more of the electrical values being monitored has gone out of range (i.e. beyond manufacturer specific-desired values).
For P0584, it indicates a high voltage situation from within the cruise control vacuum electrical circuit.
Symptoms P0584
1
Cruise control inoperative
2
CEL (Check engine light) illuminated
3
Certain functions not operating as they should (e.g. set,resume, accel., etc.)
4
Vehicle speed erratic, even with cruise set to specific speed
5
Cruise control light on permanently in instrument cluster
6
One or more cruise control functions not working properly
7
Whistling noises from engine bay
Possible Causes P0584
1
Vacuum solenoid defective
2
Cruise control servo defective
3
Vacuum lines broken/cracked/disconnected/kinked
4
Mechanical obstruction in the cruise control servo's operating range
5
Wiring issue (e.g. short, open, corrosion, resistance, chafe, etc.)
6
ECM (Engine control module) issue
7
Mechanical obstruction in vacuum passageways
8
Seized cruise control servo cable
9
Engine vacuum system leak
10
Connector issue (e.g. broken tabs, corroded pins, melted housings, insulation missing, etc.)
Solutions & Repair Steps P0584
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB) for known issues with the specific vehicle.
Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle.
The first thing's first, pop the hood to check things out within your cruise control system. You'll want to trace back the vacuum control line to see where it goes and what it controls. If it goes directly to a vacuum solenoid, thoroughly inspect the vacuum lines, solenoids, cruise control servo for physical damage. Anything obvious, should be repaired/replaced before further diagnosing.
NOTE: When inspecting the cruise control servo, also verify the cable is not seized, as this can cause the monitored electrical values to go all over the place.
If a cruise control vacuum solenoid is present, it would be wise to verify it's electrical values to rule out the possibility of an internal fault. Refer to your vehicles service manual to get the precise values and procedures. I have seen these mounted to the firewall, fender wells, intake manifolds, etc. so make sure you are working with the correct solenoid before doing anything. If the recorded values are outside of the manufacturer's desired values, replace the solenoid, clear the engine light and test drive the system.
If you have used a vacuum gauge at one point or another, it would be a good idea to monitor the vacuum within the system. It is extremely important to acquire the vacuum from specific ports off the intake systems. Generally speaking, they will be located on the intake manifold itself but refer to your manual for specifics. This heavily depends on the specifics of your engine but normally, at operating temperature, with correct ignition timing the vacuum reading should be around 50-55 kPa.
Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle.
The first thing's first, pop the hood to check things out within your cruise control system. You'll want to trace back the vacuum control line to see where it goes and what it controls. If it goes directly to a vacuum solenoid, thoroughly inspect the vacuum lines, solenoids, cruise control servo for physical damage. Anything obvious, should be repaired/replaced before further diagnosing.
NOTE: When inspecting the cruise control servo, also verify the cable is not seized, as this can cause the monitored electrical values to go all over the place.
If a cruise control vacuum solenoid is present, it would be wise to verify it's electrical values to rule out the possibility of an internal fault. Refer to your vehicles service manual to get the precise values and procedures. I have seen these mounted to the firewall, fender wells, intake manifolds, etc. so make sure you are working with the correct solenoid before doing anything. If the recorded values are outside of the manufacturer's desired values, replace the solenoid, clear the engine light and test drive the system.
If you have used a vacuum gauge at one point or another, it would be a good idea to monitor the vacuum within the system. It is extremely important to acquire the vacuum from specific ports off the intake systems. Generally speaking, they will be located on the intake manifold itself but refer to your manual for specifics. This heavily depends on the specifics of your engine but normally, at operating temperature, with correct ignition timing the vacuum reading should be around 50-55 kPa.