P0587 — Cruise Control Vent Control Circuit Low #

Note: The description of DTC P0587 may vary depending on your vehicle’s manufacturer (OEM). Always refer to your vehicle’s official service manual for the most accurate terminology.

• “Cruise Control Vent Control Circuit Low” (General/SAE standard)
• “Speed Control Vent Control Circuit Low Input” (Ford)
• “Cruise Switch ‘Vent’ Control Circuit Low” (Chrysler/Jeep/Dodge/RAM)
• “Cruise Main Switch Low Voltage” (Honda/Acura)
• “Cruise Control System Vent Circuit Low” (GM/Chevrolet)

Summary of DTC P0587 #

The P0587 code signals that your vehicle’s engine control module (ECM) or powertrain control module (PCM) has detected an abnormally low voltage in the cruise control vent control circuit. This circuit is a key part of the system that manages your cruise control — the feature that keeps your car at a steady speed without your foot on the accelerator. When the system senses a low voltage in this circuit, it usually disables cruise control to prevent unintended acceleration or loss of speed control. This code is common in vehicles with electronically controlled throttle systems, and while it typically doesn’t affect basic engine operation, it can be frustrating if you rely on cruise control for long drives. Knowing what triggers this code and how to address it can help you get back to smooth, hassle-free driving.

Common Symptoms for P0587 #

When the P0587 code is active, you’ll likely notice issues specifically with your cruise control system. You won’t usually see warning lights other than the cruise indicator, and your car should otherwise drive normally — but losing cruise control can be inconvenient, especially on highways. Typical symptoms include:

• Cruise control not engaging or working intermittently
• Cruise control light flashing or staying on
• Possible “Check Engine” or “Service Engine Soon” light (not always)
• Loss of automatic speed holding
• No response from cruise control buttons

Most Probable Causes for Code P0587 #

Like many electrical issues, the root cause of P0587 can range from something simple to a more complex component failure. Most often, the problem is related to the wiring or a switch, but sometimes it’s a deeper issue within the cruise control system.

1. Faulty cruise control switch (commonly the “vent” or “set” button)
2. Damaged or corroded wiring/connectors in the cruise control circuit
3. Blown fuse related to the cruise control system
4. Faulty clockspring (the rotary connector behind the steering wheel that allows signals to pass as you turn the wheel)
5. Defective cruise control module (on some vehicles)
6. PCM/ECM internal fault (rare)

Step-by-Step Diagnostic for P0587 #

Diagnosing P0587 doesn’t have to feel like searching for a needle in a haystack. With a systematic approach, you can quickly narrow down the culprit. Here’s how an experienced technician would tackle this code:

1. Verify the code using a professional scan tool and note any related codes.
2. Check fuse(s) for the cruise control circuit — replace if blown.
3. Inspect wiring and connectors between the cruise switch, clockspring, and control module for damage, corrosion, or loose pins.
4. Test the cruise control switch with a multimeter for proper resistance and operation (refer to OEM specifications).
5. Check the clockspring for continuity and signal passing (especially if steering wheel buttons are involved).
6. Inspect the cruise control module (if equipped) for proper operation.
7. Clear the code, test-drive, and see if the code returns.
8. If the code persists, check the PCM/ECM for internal faults (rare, but possible).

Possible Repairs for P0587 #

Once you’ve pinpointed the source of the low voltage, repairs can be straightforward or may require specialized parts. Typical solutions include:

• Replacing a faulty cruise control switch (most common fix)
• Repairing or replacing damaged wiring/connectors
• Replacing a blown fuse and addressing the root cause
• Replacing the clockspring if it’s not transmitting signals properly
• Replacing the cruise control module (less common)
• Reprogramming or replacing the PCM/ECM (very rare, after all other options have been exhausted)

Is It Safe to Drive with P0587? #

Yes, you can safely drive your vehicle with a P0587 code, but your cruise control will not function until the problem is resolved. This code does not affect critical safety or drivability systems under normal conditions. However, if you rely heavily on cruise control — for example, during long commutes or to assist with speed management — you’ll want to repair it soon. Always remain attentive and control your speed manually until the issue is fixed.

Vehicles Most Commonly Affected by P0587 #

While P0587 can appear in a variety of makes and models, it’s most frequently seen in vehicles equipped with electronic throttle and steering wheel controls from the mid-2000s onward. Some brands and models where this code is more commonly reported include:

• Chrysler, Dodge, Jeep, RAM (2005–2018, various models)
• Ford (Focus, F-150, Fusion, Escape, 2007–2016)
• GM/Chevrolet (Silverado, Malibu, Equinox, 2009–2017)
• Honda/Acura (Civic, Accord, CR-V, 2008–2016)
• Hyundai/Kia (Sonata, Elantra, Sorento, 2011–2018)

Note: This list is not exhaustive. Always check your vehicle’s service information.

Common Mistakes and Best Practices with P0587 #

It’s easy to jump to conclusions with an electrical code, but rushing through diagnosis can lead to wasted time and unnecessary parts replacement. Here’s what to watch out for — and how to get it right:

• Don’t replace the cruise control switch without testing it first — wiring faults are often to blame.
• Always inspect the clockspring if steering wheel controls are involved.
• Check for blown fuses and determine why they blew before replacing.
• Use OEM wiring diagrams for accurate pin-out and voltage checks.
• Clear codes and retest after repairs to confirm the fix.

Quick FAQ for P0587 #

Here are some fast answers to common questions about this code:

• Q: Will P0587 cause my car to fail state inspection?
  A: If the Check Engine Light is on due to P0587, it may cause your car to fail an OBD-II emissions inspection, depending on your state’s rules.
• Q: Do I need special tools to fix P0587?
  A: Basic hand tools and a digital multimeter are usually enough. For deeper diagnosis, a professional scan tool and access to wiring diagrams are helpful.

If you’re unsure about any step, consulting a professional technician or your local dealership is always a smart move!