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Engine-Codes – GMC – P1587 GMC

P1587 GMC Code - Cruise Control Clutch Control Circuit Low

Quick Answer

The P1587 code for GMC vehicles indicates an issue with the cruise control clutch control circuit being detected as low. Common causes include Faulty clutch switch, Damaged wiring harness, Malfunctioning cruise control module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1587 GMC indicates Cruise Control Clutch Control Circuit Low.
Common causes
Common causes include Faulty clutch switch, Damaged wiring harness, Malfunctioning cruise control module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1587 GMC Description

The P1587 code for GMC vehicles indicates an issue with the cruise control clutch control circuit being detected as low. This means that there is a problem with the electrical circuit that controls the cruise control system's engagement and disengagement when the clutch is pressed. In vehicles equipped with manual transmissions, the cruise control system is designed to disengage when the clutch pedal is pressed to prevent unintended acceleration.

OBDII Code P1587 GMC - Cruise Control Clutch Control Circuit Low
P1587 GMC Code - Cruise Control Clutch Control Circuit Low

Common Causes of P1587 GMC

  1. Faulty clutch switch
  2. Damaged wiring harness
  3. Malfunctioning cruise control module
  4. ECM (Engine Control Module) issue
  5. Electrical connection problems

Symptoms of P1587 GMC

  1. Cruise control not engaging or disengaging properly
  2. Check engine light illuminated on the dashboard
  3. Difficulty shifting gears or clutch engagement issues
  4. Abnormal clutch pedal feel or operation
  5. Erratic vehicle speed while using cruise control

How to Fix P1587 GMC

  1. Begin by using a scan tool to diagnose the P1587 code and determine the specific cause of the issue.
  2. Inspect the clutch switch and wiring harness for any signs of damage or wear. Replace any components as necessary.
  3. Test the cruise control module and ECM for proper functionality. Replace or reprogram as needed.
  4. Clear the diagnostic trouble codes from the vehicle's memory and test the cruise control system to ensure proper operation.
  5. Road test the vehicle to verify that the cruise control engages and disengages correctly with clutch input.

Cost to Fix P1587 GMC

The typical repair cost for resolving the P1587 code related to the cruise control clutch control circuit low can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to consult with a professional technician for a more accurate estimate based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1587 GMC Code

1. What does the OBDII code P1587 mean on a GMC vehicle?

Code P1587 indicates a problem in the cruise control clutch control circuit, specifically that the circuit is reading a low voltage.

2. What are the common symptoms of code P1587 in a GMC?

Symptoms may include the cruise control not functioning, the check engine light turning on, or erratic cruise control behavior.

3. What causes the P1587 code to appear on a GMC?

Common causes include a faulty cruise control clutch switch, damaged wiring, corroded connectors, or a malfunctioning cruise control module.

4. How is the P1587 code diagnosed on a GMC?

Diagnosis typically involves using a scan tool to confirm the code, visually inspecting the wiring and connectors, and testing the cruise control clutch switch for proper operation.

5. Can I still drive my GMC with a P1587 code active?

Yes, you can still drive the vehicle, but the cruise control system may not function, and prolonged issues could lead to further electrical problems.

6. How do you fix a P1587 code on a GMC?

Repairs may include replacing the cruise control clutch switch, repairing damaged wiring, cleaning corroded connectors, or replacing the cruise control module.

7. Is code P1587 specific to GMC vehicles?

No, while P1587 is not exclusive to GMC, it may vary slightly in meaning or diagnosis for other manufacturers. Always refer to the vehicle's service manual.

8. How much does it cost to repair a P1587 code on a GMC?

Costs can vary, but replacing a cruise control clutch switch typically ranges from $100 to $300, depending on parts and labor.

9. Can disconnecting the battery clear the P1587 code on a GMC?

Disconnecting the battery might temporarily clear the code, but if the underlying issue is not resolved, the code will likely reappear.

10. What tools are needed to fix a P1587 code on a GMC?

You may need a scan tool, multimeter, basic hand tools, and wiring diagrams for your specific GMC model to diagnose and repair the issue.

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