Quick Answer
C0187 means: C0187 indicates a malfunction in the anti-lock brake system related to the wheel speed sensor.
Can I drive with C0187? Immediate attention is recommended to prevent compromised braking performance.
Common Questions
What does C0187 mean and how does it affect my car?
The C0187 code signifies an issue with the anti-lock braking system, particularly with the wheel speed sensor. This can affect your vehicle's braking performance, leading to potentially dangerous situations, especially during emergency stops or when driving on slippery surfaces.
What are the most common causes of C0187 and how much does it cost to fix?
Common causes of the C0187 code include faulty wheel speed sensors, wiring issues, and problems with the ABS control module. Repair costs can range from $50 for wiring repairs to $800 for ABS module replacement, depending on the specific issue.
Can I drive my car with C0187 or should I stop immediately?
While you might be able to drive your car, it is not safe to do so. The C0187 code indicates a malfunction in your braking system, which could lead to brake failure. It's best to have the issue checked out as soon as possible.
How can I diagnose C0187 myself using GeekOBD APP?
To diagnose the C0187 code using the GeekOBD APP, connect the app to your vehicle, run an OBD2 scan to retrieve codes, and observe the freeze frame data to understand when and how the fault occurred. Pay attention to wheel speed sensor readings during the test.
What vehicles are most commonly affected by C0187?
The C0187 code is frequently reported in 2014-2018 Chevrolet Silverado and 2015-2019 GMC Sierra models. If you own one of these vehicles, it's important to be aware of this potential issue.
How can I prevent C0187 from happening again?
Preventive measures include regular vehicle maintenance, ensuring that wiring and sensors are inspected during routine checks, and being cautious of rough driving conditions that may damage brake components.
What is C0187?
The DTC C0187 code indicates a fault in the anti-lock brake system (ABS), specifically related to the wheel speed sensor. This code is frequently found in vehicles manufactured by General Motors, including popular models like the Chevrolet Silverado (2014-2018) and GMC Sierra (2015-2019). When the vehicle's onboard diagnostics detect a discrepancy in the wheel speed sensor signals, it triggers the C0187 code. This could manifest as erratic behavior of the ABS system, as the vehicle may struggle to differentiate between wheel speeds during braking. Drivers may experience issues such as the ABS warning light illuminating on the dashboard, which could lead to further complications if not addressed promptly. Over time, ignoring this code can lead to decreased braking performance, increased stopping distances, and, ultimately, a higher risk of accidents. It's essential for drivers to understand that the ABS plays a critical role in maintaining vehicle stability during sudden stops, especially in adverse weather conditions. Hence, addressing the C0187 code should be a priority to ensure the safety and reliability of the vehicle.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0187 is present:
- Check engine light stays on constantly, indicating an ABS issue that may lead to unsafe driving conditions.
- Brake pedal feels unusually soft or unresponsive, which can be concerning when attempting to stop quickly.
- ABS warning light illuminates, suggesting a malfunction that may prevent the anti-lock system from functioning properly.
- Unusual noises from the brakes, such as grinding or squeaking, especially during hard stops, indicating potential sensor or brake issues.
- Decreased fuel economy can occur as the vehicle struggles with braking efficiency.
Possible Causes
Most common causes of C0187 (ordered by frequency):
- The most common cause is a faulty wheel speed sensor, occurring in approximately 60% of cases; this may result from physical damage or electrical issues.
- A second common cause can be wiring problems, such as frayed or corroded wires, which can disrupt the sensor's signals to the ABS module.
- The third cause might involve issues with the ABS control module itself, which can fail due to age or overheating, leading to sensor miscommunication.
- Less common but serious causes include brake hydraulic system failure, potentially leading to complete brake loss, which requires immediate attention.
- A rare cause could be software glitches in the vehicle's onboard computer, which might need reprogramming to resolve the issue.
C0187 Repair Costs
Cost Breakdown by Repair Type
Wheel Speed Sensor Replacement
Replacing a faulty wheel speed sensor to restore proper ABS function.
- Total: $100 - $300
- Success rate: 85%
Wiring Repair
Fixing damaged wiring to ensure proper signal transmission from the wheel speed sensor.
- Total: $50 - $150
- Success rate: 75%
ABS Module Replacement
Replacing a malfunctioning ABS control module if other repairs do not resolve the issue.
- Total: $300 - $800
- Success rate: 90%
Money-Saving Tips for C0187
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional C0187 Diagnosis Process
Follow these systematic steps to accurately diagnose C0187. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the wheel speed sensor's output (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the wheel speed sensor's output (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation of the ABS after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation of the ABS after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Wheel Speed Sensor Replacement on 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado LT, 45,000 miles
Problem: Customer reported ABS warning light and soft brake pedal.
Diagnosis: After running an OBD2 scan with GeekOBD APP, C0187 was confirmed. A visual inspection revealed a damaged wheel speed sensor.
Solution: The faulty wheel speed sensor was replaced, and the ABS system was tested for proper function.
Cost: $150 (Sensor $100, Labor $50)
Result: The ABS warning light cleared, and the vehicle's braking performance returned to normal.
Case Study 2: Wiring Repair on 2016 GMC Sierra
Vehicle: 2016 GMC Sierra 1500, 60,000 miles
Problem: Customer experienced intermittent ABS issues and dashboard warning lights.
Diagnosis: OBD2 diagnostics showed C0187; further inspection identified frayed wiring near the left front wheel.
Solution: Repaired the damaged wiring and tested the ABS system for functionality.
Cost: $80 (Labor $30, Parts $50)
Result: The ABS system functioned normally, and the warning lights turned off.