Cruise Control Vacuum Control Circuit High
The P0584 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the cruise control vacuum control circuit. This circuit controls the vacuum actuator that adjusts throttle position to maintain set speed. A high voltage reading suggests a short to power, open circuit, or faulty component, potentially disabling cruise control.
1. Most Common Causes
- Short circuit of the cruise control vacuum solenoid wiring to battery voltage (B+)
- Open circuit or excessive resistance in the solenoid ground wire
- Defective cruise control vacuum solenoid (internal coil short)
- Corroded, loose, or damaged connectors in the solenoid circuit
- Intermittent wiring harness fault due to chafing or heat damage
- Internal failure of the cruise control module or PCM (less common)
2. Symptoms You Will Notice
- Cruise control inoperative
- Check Engine Light illuminated
- Cruise control light flashing or not engaging
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0584 is present. Clear codes and test drive to see if it returns.
Step 2: Visually inspect cruise control vacuum solenoid and wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check voltage at the vacuum solenoid connector. With key on, engine off, expect 12V on one pin and ground on the other. If voltage is high or missing, trace circuit.
Step 4: Test the vacuum solenoid resistance (typically 20-40 ohms). Replace if out of spec.
Step 5: If wiring and solenoid are good, suspect PCM fault; perform PCM test or reprogram.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but cruise control will not work. The vehicle remains drivable, but have it diagnosed soon to avoid potential electrical issues.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on whether it's a solenoid replacement or wiring repair.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.