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P code powertrain Medium severity

P0587 Cruise Control System Circuit Low Input

The OBD2 code P0587 indicates that there is a low voltage input detected in the cruise control system circuit, which may affect the functionality of the cruise control system

Definition

The OBD2 code P0587 indicates that there is a low voltage input detected in the cruise control system circuit, which may affect the functionality of the cruise control system

Common causes

  • Faulty cruise control switch
  • Damaged wiring or connectors
  • Faulty throttle position sensor
  • Malfunctioning brake pedal switch
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Short circuit in the cruise control circuit

Common misdiagnoses

  • Throttle position sensor issues
  • Brake light switch failure
  • Accelerator pedal position sensor problems
  • Wiring or connector issues
  • Cruise control module failure
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Malfunctioning cruise control actuator

Troubleshooting steps

  1. 1. Check the Cruise Control Switch

  2. 2. Inspect the cruise control switch for any signs of damage or wear

  3. 3. Ensure that the switch is functioning properly. You can test it with a multimeter to check for continuity

  4. 4. Inspect Wiring and Connectors

  5. 5. Examine the wiring and connectors associated with the cruise control system for any signs of damage, corrosion, or loose connections

  6. 6. Pay special attention to the wiring harness that connects the cruise control switch to the engine control module (ECM)

  7. 7. Check the Brake Pedal Position Switch

  8. 8. The cruise control system is often disabled when the brake pedal is pressed. Ensure that the brake pedal position switch is functioning correctly and is not stuck or malfunctioning

  9. 9. Test the switch for proper operation and check for any wiring issues

  10. 10. Inspect the Throttle Position Sensor (TPS)

  11. 11. The TPS provides input to the ECM regarding the position of the throttle. If it is malfunctioning, it can affect the cruise control system

  12. 12. Test the TPS for proper voltage and operation

  13. 13. Check the Vehicle Speed Sensor (VSS)

  14. 14. The cruise control system relies on the VSS to determine the vehicle's speed. If the VSS is faulty, it can cause issues with the cruise control

  15. 15. Inspect the VSS and test it for proper operation

  16. 16. Scan for Additional Codes

  17. 17. Use an OBD-II scanner to check for any other related trouble codes that may provide additional insight into the problem

  18. 18. Address any other codes that may be present

  19. 19. Inspect the Engine Control Module (ECM)

  20. 20. In rare cases, the ECM itself may be faulty. Check for any software updates or recalls related to the ECM

  21. 21. If all other components check out, consider having the ECM tested or reprogrammed

  22. 22. Clear the Code and Test Drive

  23. 23. After performing the checks and repairs, clear the trouble code using an OBD-II scanner

  24. 24. Take the vehicle for a test drive to see if the code returns and if the cruise control system functions properly

  25. 25. Consult a Professional

  26. 26. If you are unable to diagnose or resolve the issue, it may be best to consult a professional mechanic who has experience with cruise control systems and OBD-II diagnostics. By following these steps, you should be able to identify the cause of the P0587 code and take appropriate action to resolve the issue