C0279 - ABS Wheel Speed Sensor Issue in 2005-2010 Chevrolet and GMC Models

Quick Answer

C0279 means: C0279 indicates a malfunction in the ABS wheel speed sensor circuit.

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

Can I drive with C0279? Immediate attention required to ensure safe braking performance.

Common Questions

What does C0279 mean and how does it affect my car?

The C0279 code indicates an issue with the ABS wheel speed sensor circuit. This can affect your car's braking system, leading to potential safety issues, especially in slippery conditions. It's crucial to address this code promptly to maintain optimal braking performance.

What are the most common causes of C0279 and how much does it cost to fix?

Common causes of C0279 include faulty wheel speed sensors, damaged wiring, or a malfunctioning ABS module. Repair costs can range from $100 for wiring repairs to $1,200 for ABS module replacements, depending on the issue.

Can I drive my car with C0279 or should I stop immediately?

While you may still have regular braking capability, driving with C0279 is not recommended. The ABS system may not function correctly, increasing the risk of skidding during hard braking. It's best to have the issue diagnosed and repaired as soon as possible.

How can I diagnose C0279 myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for the C0279 code, check freeze frame data for context, and monitor real-time data from the wheel speed sensors to identify issues. This tool can help pinpoint the problem before taking it to a mechanic.

What vehicles are most commonly affected by C0279?

C0279 is commonly found in 2005-2010 Chevrolet and GMC models such as the Silverado, Sierra, and Equinox. Be sure to check for any recalls or technical service bulletins related to ABS issues for these vehicles.

How can I prevent C0279 from happening again?

Regular maintenance, including inspecting the ABS system and cleaning the wheel speed sensors, can help prevent C0279 from recurring. Additionally, ensuring that the brake system is serviced according to manufacturer recommendations can help maintain optimal performance.

What is C0279?

The diagnostic trouble code (DTC) C0279 indicates a problem related to the Anti-lock Braking System (ABS), specifically involving the wheel speed sensor circuit. This code typically occurs when the ABS control module detects an inconsistency in the readings from the wheel speed sensors. These sensors monitor the rotation speed of each wheel and relay this information to the ABS module. If the module identifies that a sensor is malfunctioning or if there's an electrical issue, it triggers the C0279 code. Commonly found in vehicles like the 2005-2010 Chevrolet Silverado, GMC Sierra, and Equinox, this issue can lead to decreased braking efficiency and increased stopping distances. Ignoring this code may result in the ABS light illuminating on the dashboard, and while you may still have regular braking capability, your ABS will not function correctly, increasing the risk of skidding during hard braking or slippery conditions. It’s crucial for vehicle owners to address this issue promptly to ensure safe driving conditions and maintain vehicle performance.

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

Symptoms

Common symptoms when C0279 is present:

  • The ABS warning light illuminates on your dashboard, indicating a potential issue with the braking system.
  • You may experience a lack of ABS functionality, which means the brakes may lock up during hard stops, especially on wet or slippery roads.
  • There could be a noticeable change in braking performance, such as longer stopping distances compared to previous experiences.
  • You might hear unusual noises from the ABS module when applying the brakes, especially if the system is trying to engage.
  • In some cases, you may also notice the traction control system (if equipped) not functioning properly due to the ABS issue.

Possible Causes

Most common causes of C0279 (ordered by frequency):

  1. The most common cause of the C0279 code is a faulty wheel speed sensor, with a likelihood of about 60%. These sensors can wear out or become damaged due to debris or corrosion.
  2. A second cause could be damaged wiring or connectors in the ABS system, which can lead to poor electrical connections and signal interruptions.
  3. Another cause, occurring approximately 15% of the time, is a malfunctioning ABS control module which may require reprogramming or replacement.
  4. Less common but serious causes include issues with the brake hydraulic control unit, which can lead to major braking system failures if not addressed.
  5. A rare cause might involve software glitches in the ABS system, which could necessitate a software update or re-flash to resolve.

C0279 Repair Costs

Cost Breakdown by Repair Type

Wheel Speed Sensor Replacement

Replacing the faulty wheel speed sensor is often the most effective solution.

  • Total: $150 - $300
  • Success rate: 85%
Wiring Harness Repair

Repairing or replacing damaged wiring can resolve electrical issues causing the code.

  • Total: $100 - $250
  • Success rate: 70%
ABS Module Replacement

In cases of module failure, replacement may be necessary.

  • Total: $500 - $1,200
  • Success rate: 90%
Money-Saving Tips for C0279
  • 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 C0279 Diagnosis Process

Follow these systematic steps to accurately diagnose C0279. 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).

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 - Use the GeekOBD APP to retrieve all current and stored codes, as well as freeze frame data to understand the context of the fault (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all current and stored codes, as well as freeze frame data to understand the context of the fault (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 - Utilize a multimeter or specialized diagnostic tools to test the wheel speed sensors and related wiring (20-30 minutes)

Step 3: Component testing - Utilize a multimeter or specialized diagnostic tools to test the wheel speed sensors and related wiring (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 any repairs, verify the proper operation of the ABS system and clear any codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - After any repairs, verify the proper operation of the ABS system and clear any codes using the GeekOBD APP (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 ensure that the ABS system is functioning correctly and the warning light does not return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the ABS system is functioning correctly and the warning light does not return (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: 2009 Chevrolet Silverado C0279 Repair

Vehicle: 2009 Chevrolet Silverado 1500, 85,000 miles

Problem: Customer reported ABS light was on and braking performance was inconsistent.

Diagnosis: After scanning with GeekOBD APP, the C0279 code was detected. A visual inspection revealed a damaged left front wheel speed sensor.

Solution: Replaced the left front wheel speed sensor and cleared the code. Conducted a road test to ensure ABS functioned properly.

Cost: $220 (sensor: $70, labor: $150)

Result: ABS warning light was off post-repair, and braking performance returned to normal.

Case Study 2: 2010 GMC Sierra C0279 Diagnosis

Vehicle: 2010 GMC Sierra 1500, 95,000 miles

Problem: Customer noticed unusual noises while braking, and traction control light was on.

Diagnosis: GeekOBD APP revealed C0279. A detailed inspection found corroded wiring near the ABS control module.

Solution: Repaired the corroded wiring and reprogrammed the ABS module to ensure proper function.

Cost: $300 (wiring repair: $100, module reprogramming: $200)

Result: Noise issues were resolved, and both ABS and traction control systems worked correctly.

Diagnose C0279

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: C0279
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes