Quick Answer
C0520 means: C0520 signifies a wheel speed sensor fault in the ABS system.
Can I drive with C0520? Address this issue immediately to ensure safe braking performance.
Common Questions
What does C0520 mean and how does it affect my car?
C0520 indicates a fault in the wheel speed sensor circuit, which is critical for the ABS. If the sensor fails, it can lead to compromised braking performance, increased stopping distances, and potentially dangerous situations.
What are the most common causes of C0520 and how much does it cost to fix?
The most common causes include a faulty wheel speed sensor, damaged wiring, or corrosion. Repair costs typically range from $150 to $1,200 depending on whether you need just a sensor replacement or a complete ABS module replacement.
Can I drive my car with C0520 or should I stop immediately?
While you might be able to drive your car, it is highly advisable to address the C0520 code as soon as possible to ensure your brakes function correctly. Ignoring it can lead to severe safety issues.
How can I diagnose C0520 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for trouble codes, view live data from the wheel speed sensors, and check freeze frame data to help pinpoint the issue more accurately.
What vehicles are most commonly affected by C0520?
C0520 is commonly seen in vehicles like the 2010-2015 Ford Fusion and the 2011-2016 Chevrolet Malibu, among others. Always check for any specific recalls or technical service bulletins related to your vehicle.
How can I prevent C0520 from happening again?
Regular maintenance is key. Ensure that your braking system is regularly inspected, keep the wheel speed sensors clean, and check for any wiring issues during routine checks to prevent future occurrences.
What is C0520?
The diagnostic trouble code (DTC) C0520 indicates a problem with the wheel speed sensor circuit, often related to the anti-lock braking system (ABS). This code typically arises in vehicles when the ABS control module detects an inconsistency in the readings from the wheel speed sensors. When the system detects a voltage discrepancy or an open circuit in the sensor wiring, it triggers the C0520 code. Common vehicles affected include the 2010-2015 Ford Fusion and the 2011-2016 Chevrolet Malibu. If left unaddressed, this issue can lead to compromised braking performance, especially during hard stops or slippery conditions. Drivers may notice that their ABS warning light illuminates on the dashboard. Ignoring this warning can lead to further issues, such as increased stopping distances or even brake failure in extreme cases. Therefore, understanding this code is crucial for maintaining your vehicle's safety and performance.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0520 is present:
- The ABS warning light stays illuminated on the dashboard, indicating a fault in the anti-lock braking system.
- Drivers may experience inconsistent braking, especially when attempting to stop quickly or on slippery surfaces.
- A noticeable decrease in fuel economy, which can be linked to the vehicle's braking system working harder to compensate for sensor errors.
- Unusual noises from the brakes during operation, potentially indicating a malfunctioning ABS.
- The vehicle may pull to one side during braking, suggesting uneven braking force due to faulty wheel speed sensor readings.
Possible Causes
Most common causes of C0520 (ordered by frequency):
- The most common cause is a faulty wheel speed sensor, with about 60% likelihood. This can arise from wear and tear or damage due to environmental factors.
- Another potential cause is damaged wiring or connectors, which can lead to an open circuit or short circuit in the sensor circuit.
- Corrosion or dirt buildup on the sensor can also disrupt its function, leading to erroneous readings.
- Less common, but serious, issues include a malfunctioning ABS control module, which can result in complete failure of the ABS system.
- A rare cause could be software issues within the vehicle's computer system, requiring a software update or reprogramming.
C0520 Repair Costs
Cost Breakdown by Repair Type
Wheel Speed Sensor Replacement
Replacing the faulty wheel speed sensor is a common and effective repair.
- Total: $150 - $300
- Success rate: 90%
ABS Control Module Replacement
Replacing the ABS control module is more complex and usually only necessary if the sensor replacement does not resolve the issue.
- Total: $500 - $1,200
- Success rate: 85%
Money-Saving Tips for C0520
- 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 C0520 Diagnosis Process
Follow these systematic steps to accurately diagnose C0520. 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 around the wheel speed sensors (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the wheel speed sensors (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context better (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context better (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter to test the voltage output of the wheel speed sensors and check for continuity in the wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the voltage output of the wheel speed sensors and check for continuity in the wiring (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs by conducting a brake system test and clearing codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs by conducting a brake system test and clearing codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure that the ABS warning light remains off (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure that the ABS warning light remains off (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: Ford Fusion C0520 Repair Case
Vehicle: 2013 Ford Fusion, 85,000 miles
Problem: Customer reported ABS light on and inconsistent braking performance.
Diagnosis: Initial inspection revealed corroded wiring at the left front wheel speed sensor.
Solution: Replaced the wheel speed sensor and repaired the wiring harness.
Cost: $220 including parts and labor.
Result: ABS light turned off, and braking performance returned to normal.
Case Study 2: Chevrolet Malibu C0520 Issue
Vehicle: 2015 Chevrolet Malibu, 65,000 miles
Problem: Customer noticed ABS light on and vehicle pulling to one side during braking.
Diagnosis: Diagnosis with GeekOBD APP revealed a faulty wheel speed sensor on the right rear.
Solution: Replaced the right rear wheel speed sensor and cleared the codes.
Cost: $180 in total.
Result: Braking was restored to normal, and no further issues were reported.