C0039 - Understanding the Wheel Speed Sensor Malfunction Code for Many Vehicles

Quick Answer

C0039 means: C0039 indicates a malfunction with the wheel speed sensor circuit.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with C0039? Immediate attention is recommended to ensure safe driving.

Common Questions

What does C0039 mean and how does it affect my car?

The C0039 code indicates a malfunction with the wheel speed sensor circuit, which is crucial for the anti-lock braking system (ABS) and traction control. If ignored, it could lead to serious braking issues and compromise vehicle safety.

What are the most common causes of C0039 and how much does it cost to fix?

Common causes include a faulty wheel speed sensor, corroded connectors, or damaged wiring. Repair costs generally range from $150 to $1,200, depending on the specific issue and parts required.

Can I drive my car with C0039 or should I stop immediately?

It is advisable to stop driving the vehicle until the issue is addressed, as C0039 can lead to compromised braking performance and increased risk of accidents.

How can I diagnose C0039 myself using GeekOBD APP?

Using the GeekOBD APP, first scan for any diagnostic codes. Once you identify C0039, examine freeze frame data for context and check the wheel speed sensor readings to determine if they are within normal ranges.

What vehicles are most commonly affected by C0039?

C0039 is commonly seen in various models, including the 2010-2015 Chevrolet Silverado, 2012-2016 Ford Focus, and 2009-2013 Toyota Corolla, among others. Always check for known recalls or technical service bulletins for these models.

How can I prevent C0039 from happening again?

Regular vehicle maintenance, including inspections of the brake system and wheel speed sensors, can help prevent future occurrences of C0039. Also, ensure that any repairs are properly executed to avoid issues.

What is C0039?

The diagnostic trouble code (DTC) C0039 signifies a malfunction in the wheel speed sensor circuit, which is crucial for the anti-lock braking system (ABS) and traction control. When this code surfaces, it often indicates that the vehicle's computer has detected an issue with the wheel speed sensor located on one of the wheels, typically the left front. This can lead to improper functioning of the ABS, which could result in a loss of vehicle control during braking, especially in slippery conditions. The wheel speed sensor plays a vital role in monitoring the speed of each wheel and relaying this information to the ABS control module. If the module identifies that the readings from the sensor are outside the expected range, it triggers the C0039 code. This is prevalent in various makes and models, including the 2010-2015 Chevrolet Silverado, 2012-2016 Ford Focus, and 2009-2013 Toyota Corolla. Drivers experiencing this code should be aware that ignoring it may not only compromise vehicle safety but could also lead to further damage and costly repairs if left unaddressed. Thus, it’s essential to diagnose and rectify the issue promptly to ensure safe vehicle operation.

System: C - Chassis (ABS, Steering, Suspension)

Symptoms

Common symptoms when C0039 is present:

  • The ABS warning light illuminates on the dashboard, indicating potential braking issues.
  • The vehicle's traction control may become disabled, leading to loss of stability on slippery roads.
  • Inconsistent or erratic speedometer readings, which can confuse the driver about the vehicle's speed.
  • You may notice a decrease in braking performance, particularly under hard braking conditions.
  • Unusual noises from the wheel area, such as grinding or clicking, which could indicate sensor or bearing issues.

Possible Causes

Most common causes of C0039 (ordered by frequency):

  1. The most common cause of C0039 is a faulty wheel speed sensor, which can occur in about 60% of cases. This typically happens due to wear and tear or exposure to moisture.
  2. Corrosion in the connector or damaged wiring associated with the wheel speed sensor can lead to signal disruptions. This is often found in vehicles exposed to harsh road conditions.
  3. Improper installation or alignment of the wheel speed sensor during previous repairs can lead to failure. Always ensure that repairs are done correctly to avoid this.
  4. Less common but serious causes include a malfunctioning ABS control module, which could affect the entire braking system.
  5. Rarely, physical obstructions such as debris or metal shavings can cause the sensor to malfunction, leading to erroneous readings.

C0039 Repair Costs

Cost Breakdown by Repair Type

Wheel Speed Sensor Replacement

Replacing the faulty wheel speed sensor with a new OEM part.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing damaged wiring or connectors associated with the wheel speed sensor.

  • Total: $100 - $200
  • Success rate: 80%
ABS Control Module Replacement

In rare cases, replacing the ABS control module may be necessary.

  • Total: $500 - $1,200
  • Success rate: 75%
Money-Saving Tips for C0039
  • 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 C0039 Diagnosis Process

Follow these systematic steps to accurately diagnose C0039. 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 sensor (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the wheel speed sensor (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, which helps isolate the problem (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context, which helps isolate the problem (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the wheel speed sensor’s output voltage and resistance (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the wheel speed sensor’s output voltage and resistance (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After making repairs, verify the proper operation of the ABS and clear codes to ensure the issue is resolved (10-15 minutes)

Step 4: System function test - After making repairs, verify the proper operation of the ABS and clear codes to ensure the issue is resolved (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful and that no codes reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful and that no codes reappear (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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 a 2013 Ford Focus

Vehicle: 2013 Ford Focus, 75,000 miles

Problem: Customer reported ABS warning light and traction control disabled.

Diagnosis: Diagnostic scan revealed C0039. Visual inspection showed a damaged wheel speed sensor.

Solution: Replaced the faulty wheel speed sensor. Conducted a system test to ensure proper ABS function.

Cost: $220 (including parts and labor)

Result: ABS light turned off and traction control was restored; customer reported improved vehicle handling.

Case Study 2: Wiring Repair on a 2010 Chevrolet Silverado

Vehicle: 2010 Chevrolet Silverado, 90,000 miles

Problem: Customer noticed erratic speedometer readings and ABS light on.

Diagnosis: C0039 was stored. Found corroded wiring leading to the wheel speed sensor.

Solution: Repaired the damaged wiring and cleaned the connectors.

Cost: $150 (labor and materials)

Result: Speedometer stabilized and ABS functionality was restored.

Diagnose C0039

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C0039
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes