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 typically means there is a short to power, a faulty actuator, or an issue with the PCM itself. This can disable the cruise control system and may affect throttle response.
01. Most Common Causes
- Short to power in the vacuum control circuit wiring
- Faulty cruise control vacuum actuator
- Damaged or corroded connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Cruise control inoperative
- Check Engine Light illuminated
- Possible erratic throttle behavior
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0584 and check for other codes.
Step 2: Visually inspect the vacuum control circuit wiring and connectors for damage, corrosion, or shorts.
Step 3: Test the vacuum actuator resistance and operation with a multimeter and vacuum pump.
Step 4: Check for voltage at the actuator connector with key on; if voltage is present when not commanded, repair short to power.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but cruise control will be disabled. The vehicle remains drivable, but have it diagnosed soon to prevent potential throttle issues.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, depending on the cause. Replacing the actuator may cost $100-$200 including labor.