P1587 GMC Code - Cruise Control Clutch Control Circuit Low
Quick Answer
Engine running with engine speed more than 1000 rpm (wheel speed indicates more than 20 mph in order to enable the test, and the test will disable when wheel speed is less than 5 mph), then the Powertrain Control Module (PCM) detects that the vehicle speed decreased by 1 mph in 0.5 seconds without the PCM detecting a Brake switch transition, all conditions present for 10 Accel/Decel cycles. Common causes include Faulty Cruise Control Brake Switch, Cruise Control Brake Switch harness is open or shorted, Cruise Control Brake Switch circuit poor electrical connection. 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 Cruise Control Brake Switch, Cruise Control Brake Switch harness is open or shorted, Cruise Control Brake Switch circuit poor electrical connection.
- 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.
Code P1587 GMC Description
What are the Possible Causes of the DTC P1587 GMC?
- Faulty Cruise Control Brake Switch
- Cruise Control Brake Switch harness is open or shorted
- Cruise Control Brake Switch circuit poor electrical connection
How to Fix the DTC P1587 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1587 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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