Cruise Control Vacuum Control Circuit High
The cruise control vacuum circuit is receiving too much electrical signal, like a water pipe that's overpressurized and won't shut off properly. This prevents the cruise control system from working correctly because the vacuum solenoid can't regulate engine throttle as intended.
The ECM monitors the voltage signal from the cruise control vacuum solenoid circuit. When voltage remains abnormally high (near battery voltage), it indicates a stuck open solenoid, broken wiring, or shorted component. The ECM expects the voltage to toggle between low and high states as it modulates vacuum pressure.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Vacuum Solenoid Voltage | 0-5V cycling with duty cycle modulation | Sustained >4.5V or stuck high signal |
| Circuit Resistance | 4-14 ohms (coil resistance) | >20 ohms or open circuit |
Code P0584 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0584 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.