Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P0582 Cruise Control Vacuum Control Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Older engines without electronic throttle use a vacuum cruise servo on the throttle cable: a vacuum valve (closed when unpowered) opens the throttle with intake vacuum, a vent valve (open when unpowered) holds or releases it, and a dump valve fed through the brake switch vents it when braking. Where the engine module drives these valves, it checks each circuit and switches cruise off; CARB treats this as emission-neutral, usually without warning lamp. P0582 concerns the vacuum valve circuit: an open circuit, checked with ignition on and cruise control active. Without current the vacuum valve stays closed – the safe state.

Likely causes

Connector at the servo loose or corroded
Vacuum valve coil in the servo open
Wire between servo and engine module open
Engine module driver

Symptoms

  • Cruise control cannot be engaged or switches off
  • Cruise indicator goes out or flashes (depending on vehicle)
  • Usually no check engine light, code stored only

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–300
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cruise control servoservo solenoid valvesservo wiringengine control module

Related codes

P0583P0584P0586P0594P0585

References: patents.google.com, patents.google.com, law.cornell.edu.