Description of the P0587 fault code.
OBD2 Error Codes

P0587 Cruise control ventilation control circuit low

26.05.2022 /

P0587 – OBD-II Trouble Code Technical Description

Trouble code P0587 indicates a low signal in the cruise control system ventilation control circuit.

What does the fault code mean P0587?

Trouble code P0587 indicates a low signal in the cruise control system ventilation control circuit. This means that the automatic transmission control module (PCM) has detected an abnormally low voltage or resistance level in the circuit that controls the cruise control ventilation solenoid valve. If the PCM detects that the vehicle can no longer control its own speed, a self-test will be performed on the entire cruise control system. The P0587 code will appear if the PCM detects that the voltage or resistance in the cruise control purge control solenoid valve circuit is abnormal.

Fault code P0587.

Possible reasons

Some of the possible causes of the P0587 trouble code are:

  • Purge control solenoid valve malfunction: The solenoid valve itself, which controls the ventilation of the cruise control system, may be faulty due to wear, damage, or blockage.
  • Wiring and Connectors: The wiring connecting the solenoid valve to the PCM may be open, corroded, or damaged. Poor contacts in the connectors are also possible.
  • Problems with PCM: The engine control module (PCM) itself may be faulty or have software errors, causing the cruise control system to operate incorrectly.
  • Problems with the car's electrical system: Problems with the vehicle's electrical system, such as short circuits or open circuits, can also cause the P0587 code to appear.
  • Other mechanical problems: Some other mechanical problems, such as cruise control system leaks or locks, can also cause the ventilation control circuit to go low.

To accurately determine the cause, it is necessary to conduct a detailed diagnosis using a diagnostic scanner and check the electrical circuits in accordance with the repair manual for the specific make and model of the car.

What are the symptoms of a fault code? P0587?

Symptoms for DTC P0587 may include the following:

  • Cruise control not working: One of the most obvious symptoms may be cruise control not working. This means that the driver will not be able to set or maintain the vehicle's set speed using cruise control.
  • Unstable speed: If the cruise control does activate, but the car cannot maintain a constant speed and constantly accelerates or decelerates, this may also be a sign of a problem.
  • Activation of the Check Engine indicator: A P0587 code will cause the Check Engine Light to be activated on the dashboard. This is a warning that there is an error in the system that needs to be checked.
  • Unusual sounds or vibrations: In rare cases, a malfunction in the purge control solenoid valve may cause unusual sounds or vibrations in the area of ​​this component.
  • Loss of power or unstable engine operation: Some vehicles may exhibit loss of power or engine roughness due to improper operation of the cruise control system.

How to diagnose a fault code P0587?

The following steps are recommended to diagnose DTC P0587:

  1. Using the Diagnostic Scanner: First, connect the diagnostic scanner to your car's OBD-II port and read the trouble codes. Verify that the P0587 code is actually present in the system memory.
  2. Checking wires and connectors: Inspect the wires and connectors connecting the purge control solenoid valve to the engine control module (PCM). Check them for damage, corrosion or breaks.
  3. Checking the Purge Control Solenoid Valve: Check the condition of the solenoid valve itself. Make sure it moves freely and shows no signs of wear or damage. If necessary, the valve must be replaced.
  4. Engine Control Module (PCM) Diagnosis: Diagnose the PCM to ensure it is functioning correctly and can correctly interpret signals from the purge control solenoid valve.
  5. Checking electrical circuits: Verify that the electrical circuits connecting the purge control valve to the PCM are operating properly and do not have voltage, ground, or other electrical abnormalities.
  6. Checking the cruise control system ventilation: Check the condition of the entire cruise control ventilation system, including tubes, filters and valves, to ensure there are no blockages or leaks.
  7. Additional tests: If necessary, additional tests may be needed to rule out other possible causes, such as problems with other cruise control system components or other electrical systems in the vehicle.

If you are not confident in your vehicle diagnostic or repair skills, it is recommended that you contact an experienced auto mechanic or auto repair shop to diagnose and repair the problem.

Diagnostic errors

When diagnosing DTC P0587, the following errors may occur:

  • Incomplete diagnostics of electrical circuits: An error may occur if the electrical circuits associated with the purge control solenoid valve are not fully tested. Failure to properly identify the source of the problem may result in components being replaced unnecessarily.
  • Replacement of components without prior testing: Some mechanics may immediately suggest replacing the purge control solenoid valve or other components related to the cruise control system without performing a full diagnosis. This may result in unnecessary costs for replacing functional components.
  • Ignoring the repair manual: Some mechanics may neglect repair manuals or technical bulletins, which may contain important information about diagnosing and repairing a specific problem.
  • Unreported PCM problems: Sometimes mechanics may fail to check the engine control module (PCM) for software errors or hardware problems, which could be the cause of the P0587 code.
  • Limited diagnostics: Sometimes mechanics may limit themselves to reading fault codes and not fully diagnosing the cruise control system. This may result in missing other issues affecting the operation of that system.

To avoid such errors, it is necessary to carry out a complete diagnosis using diagnostic equipment and repair manuals, and also follow the recommendations of professionals or a car service center.

How serious is the fault code? P0587?

Trouble code P0587, which indicates a low signal in the cruise control system ventilation control circuit, can be serious depending on the specific circumstances and operating conditions of the vehicle. Here are a few aspects to consider:

  • Cruise control not working: The main function of the cruise control system is to maintain a constant vehicle speed. If the cruise control does not work due to the P0587 code, it can affect driving comfort and safety, especially on long trips.
  • Potential impact on fuel economy: Cruise control usually helps maintain a stable speed, which can improve fuel economy. If cruise control is not available due to P0587, it may result in less fuel efficiency.
  • Loss of speed control: If the vehicle is unable to maintain a constant speed due to a malfunctioning cruise control system, this can be especially problematic when driving on roads with speed limits or in heavy traffic.
  • Loss of driving convenience: Cruise control is generally designed to make driving easier and reduce driver fatigue. Its absence due to the P0587 code can reduce driving comfort, especially on long trips.

While the P0587 code itself may not be critical to driving safety, it does indicate problems with the cruise control system that require attention and possibly repair. If you require the use of cruise control, or if the problem will affect your driving comfort and safety, it is recommended that you have the problem diagnosed and corrected by a qualified auto mechanic.

What repair will help eliminate the code? P0587?

The following repair steps may be required to resolve DTC P0587:

  1. Checking and replacing the purge control solenoid valve: If the purge control solenoid valve does not operate properly or is damaged, it should be replaced with a new one.
  2. Checking and replacing wires and connectors: Wires and connectors connecting the solenoid valve to the engine control module (PCM) should be inspected for damage, corrosion, or breaks. If necessary, they should be replaced or restored.
  3. Diagnostics and repair of electrical circuits: Check the electrical circuits associated with the purge control solenoid valve and the PCM for voltage, ground, or open problems. Repair or replace damaged wires and connections.
  4. PCM Software Update: Sometimes the problem can be solved by updating the PCM software. This may require visiting an authorized dealer or an authorized service center that has the necessary hardware and software to carry out the update.
  5. Additional diagnostics: If the problem is not resolved after performing the steps above, you may need to perform a more detailed diagnosis of the cruise control system to identify other possible causes of the P0587 code, such as problems with other components or electrical circuits.

Given that repair steps may vary depending on the specific cause of the error and vehicle model, it is recommended that you contact a qualified auto mechanic or auto repair shop to diagnose and repair your vehicle.

What is P0587 Engine Code [Quick Guide]

P0587 – Brand-specific information

Trouble code P0587 can be applied to various brands of cars, several examples with decodings for specific brands:

These are just a few examples, and the P0587 code may apply to other makes and models of vehicles. For more accurate information, it is recommended to contact the official repair manual or service center specialists.

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