P0587
UniversalThe powertrain control module (PCM) has detected a low voltage condition in the cruise control vent control circuit.
Low SeverityThis code indicates that the Powertrain Control Module (PCM) has detected a lower-than-expected voltage in the circuit that controls the cruise control system's vent solenoid or switch. This typically means your cruise control system will be inoperable, affecting convenience rather than vehicle safety or drivability.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is parked on a level surface with the parking brake engaged before performing any diagnostic or repair work. Disconnect the battery before working on electrical components to prevent accidental shorts or injury.
Common Symptoms
- Cruise control system is inoperable
- Check Engine Light illuminated
Common Causes
- Faulty cruise control vent control switch/solenoid
- Open or short circuit in the cruise control vent control wiring harness
- Corroded or loose electrical connectors
- Blown fuse related to the cruise control system
- Rarely, a faulty Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Inspect all fuses related to the cruise control system and replace any blown fuses.
- Visually inspect the wiring harness and connectors for the cruise control vent control for any signs of damage, corrosion, or loose connections.
- Use a multimeter to check for proper voltage and continuity at the cruise control vent control switch or solenoid.
- If possible, test the operation of the cruise control vent control switch or solenoid using manufacturer-specific diagnostic procedures.
- If a fault is identified in the switch, solenoid, or wiring, replace the affected component.
👨🔧 When to Call a Professional
If you've checked the fuses and visually inspected the wiring but the issue persists, or if you are uncomfortable working with automotive electrical systems, it's best to consult a qualified automotive technician for professional diagnosis and repair.
Commonly Asked Questions
What does "Cruise Control Vent Control Circuit Low" mean?
It means the car's computer has detected a voltage reading that is too low in the electrical circuit responsible for controlling the cruise control's vacuum vent or pressure switch.
Is it safe to drive with code P0587?
Yes, it is generally safe to drive with P0587 because it only affects the cruise control system, which is a convenience feature and not critical for the vehicle's safe operation.
Can a blown fuse cause P0587?
Yes, a blown fuse in the cruise control circuit is a common cause for this code and should be one of the first things to check.
How can I test the cruise control vent switch?
You would typically use a multimeter to check for proper voltage and continuity at the switch's electrical connector, following your vehicle's specific wiring diagram and diagnostic procedures.
Will fixing P0587 restore my cruise control?
Yes, addressing the underlying issue that triggers P0587, whether it's a faulty switch, wiring, or fuse, should restore the functionality of your cruise control system.