C020B - Understanding the C020B Code in 2015-2020 Chevrolet and GMC Models

Quick Answer

C020B means: C020B indicates an issue with the ABS sensor or circuit.

Fix: Check and replace faulty components Cost: $150 - $400 Time: 90-180 minutes

Can I drive with C020B? Immediate attention is recommended to ensure safe braking performance.

Common Questions

What does C020B mean and how does it affect my car?

The C020B code signals an issue with your vehicle's ABS system, indicating that the control module has detected a fault with the wheel speed sensor circuit. If not addressed, this could lead to compromised braking performance, especially in slippery conditions, making your vehicle less safe to drive.

What are the most common causes of C020B and how much does it cost to fix?

Common causes of C020B include faulty wheel speed sensors, damaged wiring, or issues with the ABS control module. Repair costs can range from $100 for wiring repairs to $800 for control module replacements, depending on the nature of the fault.

Can I drive my car with C020B or should I stop immediately?

Driving with the C020B code is not recommended, as it indicates that your ABS system may not function properly. This can be particularly dangerous in emergency braking situations. It's best to have the vehicle inspected and repaired at the earliest opportunity.

How can I diagnose C020B myself using GeekOBD APP?

To diagnose the C020B code, connect your vehicle to the GeekOBD APP and perform an OBD2 scan. The app will help you retrieve the DTC and provide insights into the ABS system's status. Look for any additional codes that may indicate related issues.

What vehicles are most commonly affected by C020B?

C020B is frequently reported in 2015-2020 Chevrolet Silverado and GMC Sierra models. It's essential to check for any recalls or technical service bulletins (TSBs) related to the ABS system in these vehicles.

How can I prevent C020B from happening again?

Regular maintenance of your vehicle's braking system, including periodic inspections of the ABS sensors and wiring, can prevent C020B from recurring. Additionally, ensuring your vehicle is washed regularly, especially during winter months, can help reduce corrosion risks.

What is C020B?

The Diagnostic Trouble Code (DTC) C020B indicates a malfunction in the anti-lock braking system (ABS) and is commonly found in models like the 2015-2020 Chevrolet Silverado and GMC Sierra. This code typically signifies that the ABS control module has detected a fault with the wheel speed sensor circuit. In simpler terms, it means that your vehicle's computer has identified that one or more wheel speed sensors are not functioning correctly, which can affect the performance of the ABS. If you ignore this issue, it could lead to potential safety hazards, particularly in slippery conditions where anti-lock brakes are crucial for maintaining control. The vehicle may exhibit symptoms like the ABS warning light illuminating on your dashboard and inconsistent braking behavior. Additionally, it's essential to address this code promptly, as prolonged driving with a malfunctioning ABS can lead to further damage to the braking system and costly repairs down the line.

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

Symptoms

Common symptoms when C020B is present:

  • The ABS warning light remains illuminated on the dashboard, indicating that the anti-lock braking system is not functioning properly.
  • Drivers may experience irregular braking, particularly during emergency stops or in wet conditions, which can lead to longer stopping distances.
  • A noticeable loss in brake performance, especially when going downhill or on slippery surfaces, can occur, leading to potential safety issues.
  • The vehicle may exhibit erratic behavior when braking, such as pulsating brake pedals or unresponsive brakes during sudden stops.
  • You may notice that the traction control system becomes inactive, further compromising vehicle stability under challenging driving conditions.

Possible Causes

Most common causes of C020B (ordered by frequency):

  1. The most common cause of C020B is a faulty wheel speed sensor, with a likelihood of 60%. This can occur due to wear and tear, corrosion, or physical damage from road debris.
  2. Another potential cause is damaged wiring or connectors in the ABS circuit, which could account for 25% of the issues. This may be due to exposure to moisture or road salt.
  3. A malfunctioning ABS control module might be the culprit, with about 10% likelihood. This requires thorough testing to confirm before replacement.
  4. Less common but serious causes include a failure in the brake system itself, such as air in the brake lines, which can lead to both C020B and other codes appearing.
  5. Rarely, software issues within the ABS control module may trigger this code, requiring a software update or reprogramming to resolve.

C020B Repair Costs

Cost Breakdown by Repair Type

Wheel Speed Sensor Replacement

Replacing the faulty wheel speed sensor to restore proper ABS function.

  • Total: $150 - $400
  • Success rate: 85%
ABS Control Module Repair

Reprogramming or replacing the ABS control module if found defective.

  • Total: $300 - $800
  • Success rate: 90%
Wiring and Connector Repair

Fixing damaged wiring or connectors in the ABS circuit.

  • Total: $100 - $250
  • Success rate: 80%
Money-Saving Tips for C020B
  • 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 C020B Diagnosis Process

Follow these systematic steps to accurately diagnose C020B. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Begin with an initial visual inspection of the ABS wiring and connectors for any obvious damage or corrosion, which takes about 5-10 minutes

Step 1: Begin with an initial visual inspection of the ABS wiring and connectors for any obvious damage or corrosion, which takes about 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: Use the GeekOBD APP to perform an OBD2 scan to retrieve the C020B code along with any other related codes, allowing for a comprehensive understanding of the situation (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan to retrieve the C020B code along with any other related codes, allowing for a comprehensive understanding of the situation (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: Conduct component testing on the wheel speed sensors with a multimeter to check for proper voltage and signal transmission (20-30 minutes)

Step 3: Conduct component testing on the wheel speed sensors with a multimeter to check for proper voltage and signal transmission (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: After repairs, perform a system function test to ensure that the ABS operates correctly and clear the DTC codes via the GeekOBD APP (10-15 minutes)

Step 4: After repairs, perform a system function test to ensure that the ABS operates correctly and clear the DTC codes via 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: Finally, carry out a road test under various driving conditions to verify that the ABS is functioning properly and to confirm the repair's success (15-20 minutes)

Step 5: Finally, carry out a road test under various driving conditions to verify that the ABS is functioning properly and to confirm the repair's success (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: C020B Code on a 2016 Chevrolet Silverado

Vehicle: 2016 Chevrolet Silverado 1500, 75,000 miles

Problem: Customer reported that the ABS warning light was illuminated and experienced brake pulsation.

Diagnosis: Performed an OBD2 scan using GeekOBD APP and confirmed C020B. Conducted visual inspection and found a damaged wheel speed sensor.

Solution: Replaced the faulty wheel speed sensor and cleared the codes. Conducted a system function test to confirm repair success.

Cost: $200 (Sensor $120, Labor $80)

Result: The ABS warning light turned off, and the customer reported normal braking performance.

Case Study 2: C020B on a 2018 GMC Sierra

Vehicle: 2018 GMC Sierra 1500, 50,000 miles

Problem: ABS light was on, and the vehicle felt unstable during braking.

Diagnosis: Used GeekOBD APP to retrieve C020B and found damaged wiring to the wheel speed sensor.

Solution: Repaired the wiring harness, reconnected the sensor, and verified the ABS operation.

Cost: $150 (Wiring repair $100, Labor $50)

Result: The ABS light was cleared, and the vehicle's braking was restored to normal.

Diagnose C020B

Use GeekOBD APP for professional diagnosis!

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  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: C020B
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes