Introduction:
The diagnostic trouble code (DTC) C0587 indicates a problem within the left rear corner of a vehicle's electronic stability control (ESC) or anti-lock braking system (ABS). Specifically, it signifies that the control module has detected a low voltage or current condition in the circuit controlling the left rear solenoid valve within the hydraulic control unit (HCU). Understanding the potential causes and troubleshooting steps for this code is crucial for maintaining vehicle safety and performance.
Table: C0587 - Left Rear Solenoid Circuit Low
| Topic | Description | Possible Solutions |
|---|---|---|
| Definition | Low voltage or current detected in the circuit controlling the left rear solenoid valve within the HCU. This solenoid valve is responsible for controlling brake pressure to the left rear wheel. | This is not a solution but helps to understand the problem. |
| Affected Systems | Electronic Stability Control (ESC), Anti-lock Braking System (ABS), Traction Control System (TCS). These systems rely on individual wheel brake control. | Addressing this code restores full functionality of these safety systems. |
| Common Symptoms | ABS light illuminated, ESC light illuminated, TCS light illuminated, Reduced braking performance on the left rear wheel, Extended stopping distances, Brake pedal may feel different. | Pay attention to these symptoms to diagnose the problem early. |
| Potential Causes | Faulty left rear solenoid valve, Wiring harness damage (corrosion, shorts, opens), Poor electrical connection, Faulty ABS control module, Low system voltage, Internal HCU failure. | Thoroughly inspect all components before replacing any parts. |
| Diagnostic Steps | Scan for other DTCs, Inspect wiring and connectors, Test solenoid valve resistance, Check system voltage, Perform a solenoid valve actuation test, Consult vehicle-specific repair manual. | Follow a systematic approach to diagnose the root cause. |
| Solenoid Valve Function | Electromagnetically controlled valve that regulates brake fluid pressure to the left rear wheel cylinder/caliper. It opens and closes in response to signals from the ABS/ESC module. | Understanding its function helps in understanding the impact of its failure. |
| Wiring Issues | Breaks in the wire, corrosion, short to ground, short to voltage. These issues can prevent proper voltage from reaching the solenoid. | Carefully inspect the wiring harness for any signs of damage. Use a multimeter to check for continuity and voltage. |
| Connector Problems | Corroded terminals, loose connections, damaged connector housings. These can create high resistance and prevent proper electrical flow. | Clean and inspect all connectors associated with the left rear solenoid valve and the ABS/ESC module. Apply dielectric grease to prevent future corrosion. |
| ABS Control Module Fault | Internal failure within the ABS control module. This is less common but can cause the module to send incorrect signals or fail to send signals at all. | This is the least likely cause, but the ABS module should be tested if all other causes are ruled out. |
| Solenoid Resistance Test | Measure the resistance of the solenoid valve using a multimeter. Compare the reading to the manufacturer's specifications. An open or shorted solenoid will have an incorrect resistance reading. | This test can quickly identify a faulty solenoid valve. |
| Actuation Test | Use a scan tool to command the solenoid valve to activate. Listen for a clicking sound from the solenoid and check for changes in brake pressure. | This test confirms the solenoid valve's ability to respond to commands from the ABS/ESC module. |
| Hydraulic Control Unit (HCU) Internal Failure | Internal mechanical or electrical failure within the HCU, affecting the solenoid valve's operation. This is often a last resort diagnosis. | The HCU might need professional repair or replacement. |
| Related DTCs | C0035 (Left Front Wheel Speed Sensor Circuit), C0040 (Right Front Wheel Speed Sensor Circuit), C0045 (Left Rear Wheel Speed Sensor Circuit), C0050 (Right Rear Wheel Speed Sensor Circuit), C0110 (Pump Motor Circuit). | These codes can help narrow down the problem area and identify related issues. |
| Tools Required | Scan tool with ABS/ESC diagnostic capabilities, Multimeter, Wiring diagrams, Socket set, Wrench set, Dielectric grease. | Having the right tools makes the diagnostic process much easier and more efficient. |
| Safety Precautions | Disconnect the battery before working on the electrical system. Wear safety glasses. Be careful when working with brake fluid. | Always prioritize safety when working on vehicle systems. |
Detailed Explanations:
Definition: The DTC C0587 indicates that the vehicle's computer has detected a problem with the electrical circuit controlling the left rear solenoid valve within the Hydraulic Control Unit (HCU) of the ABS/ESC system. This circuit is reporting a low voltage or current condition, suggesting an issue preventing the solenoid from operating correctly.
Affected Systems: The Electronic Stability Control (ESC), Anti-lock Braking System (ABS), and Traction Control System (TCS) are all affected by this code. These systems rely on individual wheel brake control to function properly. If the left rear solenoid is not working correctly, the vehicle's ability to prevent skidding, maintain stability, and optimize traction will be compromised.
Common Symptoms: Common symptoms associated with the C0587 code include the ABS light, ESC light, and TCS light illuminating on the dashboard. You may also experience reduced braking performance on the left rear wheel, leading to extended stopping distances or a feeling that the brake pedal is behaving differently than usual.
Potential Causes: Several factors can trigger the C0587 code. These include a faulty left rear solenoid valve itself, damage to the wiring harness (corrosion, shorts, opens), poor electrical connections, a faulty ABS control module, low system voltage, or, in some cases, an internal failure of the HCU. Identifying the root cause requires a systematic diagnostic approach.
Diagnostic Steps: Start by scanning the vehicle for other DTCs, as related codes can provide valuable clues. Next, thoroughly inspect the wiring and connectors associated with the left rear solenoid valve for any signs of damage or corrosion. Use a multimeter to test the solenoid valve's resistance and check the system voltage. An actuation test using a scan tool can also help determine if the solenoid is responding to commands. Finally, consult the vehicle-specific repair manual for detailed troubleshooting procedures.
Solenoid Valve Function: The solenoid valve is an electromagnetically controlled valve that regulates the brake fluid pressure to the left rear wheel cylinder or caliper. It opens and closes in response to signals from the ABS/ESC module. When the module detects a wheel is about to lock up, it sends a signal to the solenoid valve to release pressure, preventing the wheel from skidding.
Wiring Issues: Wiring problems are a common cause of the C0587 code. Breaks in the wire, corrosion, a short to ground, or a short to voltage can all prevent proper voltage from reaching the solenoid valve. Carefully inspect the wiring harness for any signs of damage, paying close attention to areas where the harness is exposed to the elements or subject to movement.
Connector Problems: Corroded terminals, loose connections, and damaged connector housings can create high resistance and prevent proper electrical flow to the solenoid valve. Clean and inspect all connectors associated with the left rear solenoid valve and the ABS/ESC module. Apply dielectric grease to prevent future corrosion.
ABS Control Module Fault: While less common, a faulty ABS control module can also cause the C0587 code. Internal failures within the module can cause it to send incorrect signals or fail to send signals at all. The ABS module should be tested if all other potential causes have been ruled out.
Solenoid Resistance Test: Use a multimeter to measure the resistance of the solenoid valve. Compare the reading to the manufacturer's specifications. An open or shorted solenoid will have an incorrect resistance reading, indicating a faulty solenoid valve.
Actuation Test: Use a scan tool to command the solenoid valve to activate. Listen for a clicking sound from the solenoid and check for changes in brake pressure. This test confirms the solenoid valve's ability to respond to commands from the ABS/ESC module. If the solenoid does not activate, it may be faulty or there may be a wiring issue.
Hydraulic Control Unit (HCU) Internal Failure: In rare cases, the C0587 code may be caused by an internal mechanical or electrical failure within the HCU. This is often a last resort diagnosis, as the HCU is a complex and expensive component. If all other potential causes have been ruled out, the HCU may need professional repair or replacement.
Related DTCs: Pay attention to any other DTCs that may be present. Related codes, such as C0035 (Left Front Wheel Speed Sensor Circuit), C0040 (Right Front Wheel Speed Sensor Circuit), C0045 (Left Rear Wheel Speed Sensor Circuit), C0050 (Right Rear Wheel Speed Sensor Circuit), and C0110 (Pump Motor Circuit), can help narrow down the problem area and identify related issues.
Tools Required: Diagnosing and repairing the C0587 code requires a few essential tools, including a scan tool with ABS/ESC diagnostic capabilities, a multimeter, wiring diagrams specific to your vehicle, a socket set, a wrench set, and dielectric grease.
Safety Precautions: Always disconnect the battery before working on the electrical system to prevent accidental shorts or shocks. Wear safety glasses to protect your eyes from debris. Be careful when working with brake fluid, as it can damage paint and irritate skin.
Frequently Asked Questions:
What does C0587 mean? It indicates a low voltage or current condition in the circuit controlling the left rear solenoid valve within the HCU of the ABS/ESC system.
What are the symptoms of C0587? Common symptoms include ABS, ESC, and TCS lights illuminating, reduced braking on the left rear wheel, and extended stopping distances.
Can I drive with a C0587 code? It is not recommended, as it affects braking and stability control, potentially compromising safety.
What is the first thing I should check? Inspect the wiring and connectors associated with the left rear solenoid valve for damage or corrosion.
How do I test the solenoid valve? Use a multimeter to measure the resistance of the solenoid valve and compare it to the manufacturer's specifications.
Conclusion:
The C0587 code points to a problem within the left rear brake control system, which can impact your vehicle's safety and performance. A systematic approach to diagnosis, starting with wiring and connector inspections and progressing to solenoid valve testing, is crucial for identifying the root cause and implementing the appropriate repair. Promptly addressing this issue is essential for restoring full functionality to the ABS, ESC, and TCS systems.