P0582 Cruise Control Vacuum Control Circuit/Open means the engine or cruise control computer has detected an open electrical circuit in the vacuum control system. The fault is usually caused by a damaged wire, loose connector, failed vacuum control solenoid, blown fuse, or defective cruise control actuator—not necessarily a vacuum leak. Cruise control may stop working, disengage unexpectedly, or trigger the check engine light.
This is an informational diagnostic code, not a reason to replace the cruise control module immediately. A proper diagnosis should verify the fuse, wiring, solenoid resistance, power supply, ground, and vacuum actuator operation in that order.
What Does the P0582 Code Mean?
Diagnostic trouble code P0582 is a generic OBD-II powertrain code associated with the cruise control vacuum control circuit. In many vehicles, the cruise control system uses an electrically controlled vacuum solenoid to apply or release vacuum at a servo or actuator. The actuator then moves the throttle linkage to maintain the selected speed.
The word “open” is important. It indicates that the control module sees an interrupted electrical path or an electrical condition outside its expected range. The code does not automatically prove that the vacuum hose, vacuum pump, or cruise control computer has failed.
System design varies significantly by manufacturer. Some newer vehicles use an electronic throttle and an electric cruise actuator rather than a traditional vacuum servo. Always compare the code description and wiring diagram with the specific vehicle before testing components.
Common Symptoms of P0582
The most noticeable symptom is usually inoperative cruise control. Depending on the vehicle and the way the fault occurred, the cruise system may be disabled as soon as the code is stored or may work intermittently until the open circuit becomes permanent.
- Cruise control will not set or engage.
- Cruise control switches appear to work, but the vehicle will not hold speed.
- The system disengages without a clear reason.
- The cruise control indicator does not illuminate or flashes.
- The check engine light is on.
- Stored communication or brake-switch codes may appear alongside P0582.
- In some vehicles, fail-safe programming disables cruise control after another engine or throttle fault is detected.
P0582 usually does not cause poor engine performance because cruise control is a convenience system. However, if the code is accompanied by throttle, brake, transmission, or power-supply faults, the vehicle may show additional drivability symptoms that require separate diagnosis.
Most Likely Causes of P0582
- An open, broken, or corroded wire in the cruise vacuum control circuit.
- A loose, water-damaged, or poorly seated solenoid connector.
- A failed vacuum control solenoid with an open internal coil.
- A blown fuse or a poor fuse-box connection.
- A failed cruise control actuator or vacuum servo.
- Damaged vacuum hoses, although a hose leak alone more commonly causes a vacuum-performance problem than an electrical “open” code.
- Faulty brake pedal or clutch pedal switch input.
- A defective cruise control module or powertrain control module, which is less common than wiring or solenoid failure.
- Previous repair work, aftermarket accessories, rodent damage, or engine-bay heat damage.
How to Diagnose P0582 Correctly
Do not begin by replacing the module. A circuit labeled “open” can often be repaired with a connector, terminal, fuse, or short section of wire. The following procedure is a practical starting point, but the vehicle’s service manual should be used for connector pinouts and expected values.
1. Check all stored codes and freeze-frame data
Use a scan tool to record every code, not just P0582. Freeze-frame information can show whether the fault appeared during startup, braking, acceleration, or a low-voltage event. Codes related to the brake switch, throttle position, vehicle speed, or battery voltage may change the diagnostic direction.
2. Inspect the fuse and power supply
Check the cruise control fuse with a test light or multimeter on both test points. A fuse can look intact but fail electrically, and replacing it without finding the cause may result in another failure. If the replacement fuse blows immediately, suspect a shorted solenoid, damaged harness, or water intrusion rather than installing a larger fuse.
3. Examine the wiring and connectors
Inspect the harness from the cruise control actuator or vacuum solenoid toward the fuse box and control module. Look for insulation rubbed through against a bracket, green corrosion inside a connector, pulled terminals, and wires stretched tightly near the throttle body. A useful professional technique is a gentle wiggle test while monitoring circuit voltage or scan-tool data; an intermittent open may appear only when the harness moves.
4. Test the vacuum control solenoid
Disconnect the solenoid and measure resistance across its terminals. The correct specification is vehicle-specific, so use the manufacturer’s service information rather than relying on a universal ohm value. An infinite reading generally indicates an open coil, while a near-zero reading suggests a shorted coil.
With the connector unplugged, also check whether either solenoid terminal is unintentionally shorted to ground. If the solenoid resistance is normal, verify that it receives the correct switched power and that the control side is being grounded or driven as designed. Some systems use a pulsed ground controlled by the module, so a simple static voltage check can be misleading.
5. Test the vacuum side separately
To test a traditional vacuum cruise actuator, connect a hand-held vacuum pump directly to the actuator, following the service manual’s connection procedure. Apply vacuum gradually and watch whether the actuator moves smoothly and holds vacuum. If the vacuum drops quickly, inspect the actuator diaphragm, hose, check valve, and reservoir.
Do not apply vacuum blindly to an electronic throttle system or an actuator that is not designed for a hand pump. Confirm the component type first. A vacuum test can prove that the mechanical side works, but it cannot prove that the electrical solenoid is being commanded correctly.
6. Check the brake and clutch release circuits
Cruise control is deliberately canceled when the brake or clutch pedal is pressed. A misadjusted brake switch can make the system appear dead even when the vacuum circuit is healthy. Confirm that the brake lights operate normally and that the cruise release switch changes state correctly in live scan data or with a meter.
Can a Blown Fuse Disable Cruise Control?
Yes. A blown fuse can disable cruise control if it supplies the cruise module, actuator, vacuum solenoid, steering-wheel controls, or a shared engine-control circuit. In some vehicles, the same fuse also powers unrelated systems, so additional warning lights or accessories may stop working.
Replace the fuse only with the specified rating. If it fails again, the underlying problem may be a shorted solenoid, chafed wiring, or water entering the fuse box. Repeatedly replacing the fuse is not a repair and can create a fire risk.
What Are the Symptoms of a Bad Cruise Control Module?
A failed module can cause several cruise-control functions to stop responding, but its symptoms overlap with wiring and switch faults. Possible signs include no response to the cruise buttons, inability to communicate with the module, multiple internal module codes, intermittent operation, or a cruise system that disengages without a valid brake or clutch input.
Module failure should be considered only after power, grounds, network communication, input switches, actuator wiring, and the solenoid have passed testing. A module that has no power or ground cannot be condemned until those feeds are verified under load. Corrosion at the connector is often mistaken for an electronic failure.
P0582 Repair Options and Typical Cost
Repair cost depends on the failed part and vehicle access. A fuse or connector repair may cost approximately $10–$150. Wiring diagnosis and harness repair commonly falls between $100 and $400, depending on labor time and whether the harness is difficult to reach.
A vacuum control solenoid may cost about $80–$300 installed. A cruise actuator or servo can range from $200 to $700. Replacing a cruise control module often costs approximately $300–$1,000 or more, including programming on vehicles that require module configuration. Dealer pricing, vehicle age, parts availability, and regional labor rates can move these figures substantially.
Before approving a module replacement, ask the repair shop to show the failed power or ground test, communication result, or component measurement. This simple request helps prevent an expensive parts-swapping repair when the real fault is a corroded terminal or broken wire.
Is It Safe to Drive With P0582?
In most cases, the vehicle remains drivable because the code affects cruise control rather than basic engine operation. You should drive without using cruise control until the fault is repaired, especially if the system engages or releases unpredictably.
Stop and investigate sooner if P0582 appears with throttle-control warnings, unintended acceleration, brake-switch problems, reduced-power mode, or multiple electrical faults. Those additional symptoms can indicate a broader power or control-system issue.
Final Takeaway
P0582 identifies an open or electrically abnormal cruise control vacuum control circuit. Start with the fuse, wiring, connectors, solenoid resistance, power and ground checks, then test the vacuum actuator if the vehicle uses one. The cruise control module is a possible cause, but it is rarely the first part that should be replaced.
If you have a scan tool, multimeter, wiring diagram, and hand vacuum pump, the fault can often be isolated without guessing. If the circuit requires access to airbag wiring, throttle controls, or manufacturer-specific programming, use a qualified technician and request test results before authorizing parts.
Frequently Asked Questions
What does P0582 mean on a car?
P0582 means the vehicle computer detected an open or abnormal electrical condition in the cruise control vacuum control circuit. The cause may be wiring, a connector, fuse, solenoid, actuator, or less commonly the control module.
How do I test a cruise control vacuum?
On a vacuum-operated system, connect a hand vacuum pump directly to the actuator and confirm that it moves smoothly and holds vacuum. A rapid vacuum loss points to a leaking diaphragm, hose, check valve, or reservoir. Verify the vehicle uses a vacuum actuator before performing this test.
Can a blown fuse disable cruise control?
Yes. A fuse may supply the cruise module, vacuum solenoid, actuator, or steering-wheel controls. Check the fuse electrically and investigate why it failed if the replacement blows again.
How much does it cost to replace a cruise control module?
A cruise control module replacement commonly costs about $300–$1,000 or more, including labor and possible programming. Diagnosis should confirm module failure first because a wiring repair or solenoid replacement is usually less expensive.
