Diagnostic trouble code P0584 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 modulates throttle position to maintain set speed. A high voltage reading typically points to a short to power, a faulty solenoid, or a wiring issue.
The solenoid itself is the most common failure point. Internal shorts or open windings can cause a high voltage reading.
A wire chafed against a 12V source or a connector pin pushed back can supply excessive voltage to the circuit.
Moisture or corrosion can create a high-resistance short that the PCM interprets as high voltage.
In very rare cases, an internal driver failure in the PCM can cause a false high voltage reading. This should only be considered after all other components and wiring are verified.
No, P0584 is an electrical fault code (high voltage), not a performance or vacuum leak code. A vacuum leak would typically set a different code like P0505 or P0507.
Almost never. The PCM is rarely the cause of this code. The most common fix is replacing the cruise control vacuum solenoid or repairing a short in its wiring. Replacing the PCM should be a last resort after thorough diagnosis.
Yes, the vehicle is generally safe to drive, but cruise control will not function. The Check Engine Light may remain on. It is advisable to diagnose and repair the issue to restore cruise control and prevent potential electrical problems.