P0584 OBD II Trouble Code Cruise Control Vacuum Control Circuit High

How to quickly diagnose, repair, and causes of a P0584 diagnostic code that indicates a detected high voltage situation within the cruise control vacuum control circuit.

Symptoms of P0584 OBD II Trouble Code

  • Cruise control inoperative
  • CEL (Check engine light) illuminated
  • Certain functions not operating as they should (e.g. set,resume, accel., etc.)
  • Vehicle speed erratic, even with cruise set to specific speed
  • Cruise control light on permanently in instrument cluster
  • One or more cruise control functions not working properly
  • Whistling noises from engine bay

Common Causes of P0584 OBD II Trouble Code

  • Vacuum solenoid defective
  • Cruise control servo defective
  • Vacuum lines broken/cracked/disconnected/kinked
  • Mechanical obstruction in the cruise control servo's operating range
  • Wiring issue (e.g. short, open, corrosion, resistance, chafe, etc.)
  • ECM (Engine control module) issue
  • Mechanical obstruction in vacuum passageways
  • Seized cruise control servo cable
  • Engine vacuum system leak
  • Connector issue (e.g. broken tabs, corroded pins, melted housings, insulation missing, etc.)

Severity of P0584 OBD II Trouble Code

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.