It is safe to keep driving — only cruise control is disabled — so you can repair it at your convenience once the open circuit or servo is identified. P0582 means the computer has detected an open in the control circuit for the cruise-control vacuum servo — the electrical command that lets the cruise system pull the throttle via a vacuum actuator. The usual result is that cruise control simply stops working, while the rest of the engine runs normally.
What P0582 means
On vehicles that use a vacuum-operated cruise servo, the control module opens and closes small solenoids to apply engine vacuum to a diaphragm that holds or adjusts the throttle for you. The module watches the electrical circuit that drives that vacuum control and expects it to be complete. P0582 sets when it sees an open — the circuit is broken, disconnected or reading no continuity — so it can no longer trust or operate the vacuum servo and disables cruise control. This is an electrical-circuit fault on the control side, distinct from a vacuum leak in the hose itself, although a related vacuum problem can accompany it. Because it only affects the cruise convenience feature, drivability and safety are otherwise unaffected.
Symptoms
- Cruise control will not engage or immediately disengages
- Cruise indicator light does not come on, or flashes and cancels
- Check-engine light with the cruise system inoperative
- Cruise works intermittently, dropping out over bumps or with connector movement
- No response from the set/resume controls even at proper speed
- Other engine functions remain completely normal
Common causes
- Open, broken or disconnected wire in the vacuum-servo control circuit
- Failed cruise-control vacuum servo or its internal solenoid
- Corroded or loose connector at the servo or control module
- Chafed harness where it routes near the throttle or firewall
- Blown fuse feeding the cruise control circuit
- Faulty cruise-control module (verify wiring and servo first)
Severity & driving advice
Severity: Low — This affects only the cruise-control convenience feature; the engine and brakes are unaffected.
Can I drive? It is safe to keep driving — only cruise control is disabled — so you can repair it at your convenience once the open circuit or servo is identified.
Diagnostic approach
- Confirm the fault and read data — Verify cruise is inoperative and read the code plus any related cruise data on a scan tool to confirm P0582 is current.
- Check power and fuses — Confirm the cruise system has power and a good fuse before chasing the control circuit.
- Test the servo control circuit — Using the wiring diagram, measure continuity and voltage on the vacuum-servo control wires to find the open between the module and the servo.
- Inspect the servo and connectors — Check the vacuum servo, its solenoids and connectors for damage, corrosion and secure seating; test the servo's coil resistance to spec.
- Wiggle-test for intermittents — Flex the harness and reseat connectors while monitoring the circuit to catch an intermittent open before replacing the module.
FAQ
Is it safe to drive with P0582?
Yes. P0582 only disables cruise control; your engine, throttle and brakes all work normally, so you can repair it whenever convenient.
Is this a vacuum leak or an electrical problem?
P0582 specifically flags an open in the electrical control circuit for the vacuum servo, so start with wiring and connectors rather than assuming a leaking hose, though both can occur together.
Why does my cruise work sometimes?
An intermittent open — often a corroded connector or a chafed wire — can restore contact over bumps or with movement, which is why a wiggle-test helps locate it.
Will P0582 affect fuel economy or power?
No. It has no effect on how the engine runs; it only prevents the cruise-control servo from operating.