C008B - Understanding the Brake Pressure Sensor Circuit Range/Performance Issue in 2015-2020 Chevrolet Silverado

Quick Answer

C008B means: C008B indicates a brake pressure sensor circuit issue, affecting brake performance.

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

Can I drive with C008B? Immediate attention is recommended to ensure safe vehicle operation.

Common Questions

What does C008B mean and how does it affect my car?

The C008B code indicates a problem with the brake pressure sensor circuit. This can lead to compromised braking performance, increased stopping distances, and potentially unsafe driving conditions. If you notice your brake light is on or experience unusual brake behavior, it's crucial to address this code promptly to ensure your safety.

What are the most common causes of C008B and how much does it cost to fix?

Common causes of C008B include a faulty brake pressure sensor, wiring issues, and fluid contamination. Repair costs can range from $100 for wiring repairs to $600 for a control module replacement, depending on the specific issue and labor costs at your repair shop.

Can I drive my car with C008B or should I stop immediately?

It's not advisable to drive a vehicle with the C008B code. The brake system's performance may be compromised, which poses a serious safety risk. It's best to have the vehicle inspected and repaired as soon as possible.

How can I diagnose C008B myself using GeekOBD APP?

To diagnose C008B using the GeekOBD APP, start by scanning your vehicle for DTCs. The app will provide detailed codes, including C008B. Review freeze frame data to understand the conditions that triggered the code, and check for any additional codes that might indicate related issues.

What vehicles are most commonly affected by C008B?

The C008B code is often seen in vehicles such as the 2015-2020 Chevrolet Silverado, GMC Sierra, and other models within the GM family. If your vehicle falls within these ranges, be aware of potential brake system issues.

How can I prevent C008B from happening again?

To prevent C008B from reoccurring, ensure regular maintenance of your braking system, including brake fluid checks, inspections of wiring, and timely replacement of worn components. Keeping an eye on the health of the brake pressure sensor specifically can also help avoid future issues.

What is C008B?

The diagnostic trouble code (DTC) C008B relates to a problem with the brake pressure sensor circuit, specifically indicating a range or performance issue. This code is particularly common in vehicles like the 2015-2020 Chevrolet Silverado, among others. The brake pressure sensor is crucial for monitoring the hydraulic pressure in the braking system. When this sensor fails or sends incorrect data to the vehicle's computer, it can trigger the C008B code. Drivers may experience symptoms such as the illumination of the brake warning light on the dashboard, reduced braking efficiency, or even unexpected brake behavior. It's essential to address this issue promptly, as it can compromise the vehicle's safety and performance. Ignoring the symptoms could lead to more severe problems, including complete brake failure. In practical terms, this means that if you see the C008B code, you should take it seriously and consider having the vehicle inspected and repaired by a qualified technician. The underlying causes can range from a faulty sensor to wiring issues, and getting to the root of the problem quickly can save you time and money in the long run.

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

Symptoms

Common symptoms when C008B is present:

  • The brake warning light remains illuminated on the dashboard, alerting the driver to a potential issue.
  • The vehicle experiences inconsistent braking performance, such as delayed response or a spongy brake pedal.
  • Increased stopping distances observed, with feedback indicating that the brakes are not engaging effectively.
  • Unusual noises when braking, such as grinding or squeaking, may indicate further issues in the braking system.
  • Diagnostic scans reveal the C008B code along with additional codes, suggesting a broader issue in the brake system.

Possible Causes

Most common causes of C008B (ordered by frequency):

  1. The most common cause of C008B is a faulty brake pressure sensor, which occurs in about 60% of cases. This can happen due to wear and tear or exposure to harsh conditions.
  2. Wiring issues, such as frayed wires or poor connections, can also lead to this code. These problems are often found in older vehicles or those exposed to rugged environments.
  3. Brake fluid contamination or low fluid levels can affect sensor readings. Regular maintenance and inspections can help prevent this issue.
  4. Less commonly, a malfunctioning brake control module can trigger C008B. This requires specialized diagnostics to identify.
  5. In rare cases, software glitches in the vehicle's computer system can misinterpret sensor data, leading to false codes.

C008B Repair Costs

Cost Breakdown by Repair Type

Brake Pressure Sensor Replacement

Replacing the faulty brake pressure sensor with an OEM part.

  • Total: $150 - $300
  • Success rate: 95%
Wiring Repair

Repairing or replacing damaged wiring or connectors related to the brake system.

  • Total: $100 - $200
  • Success rate: 85%
Brake Control Module Replacement

Replacing the brake control module if it’s found to be malfunctioning.

  • Total: $300 - $600
  • Success rate: 90%
Money-Saving Tips for C008B
  • 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 C008B Diagnosis Process

Follow these systematic steps to accurately diagnose C008B. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform an initial visual inspection of the brake system, checking for damaged wiring, loose connections, or fluid leaks (5-10 minutes)

Step 1: Perform an initial visual inspection of the brake system, checking for damaged wiring, loose connections, or fluid leaks (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 scan the vehicle's OBD2 system and retrieve all diagnostic trouble codes, including freeze frame data (10-15 minutes)

Step 2: Use the GeekOBD APP to scan the vehicle's OBD2 system and retrieve all diagnostic trouble codes, including freeze frame data (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: Test the brake pressure sensor with a multimeter to ensure it operates within the manufacturer's specifications (20-30 minutes)

Step 3: Test the brake pressure sensor with a multimeter to ensure it operates within the manufacturer's specifications (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: Conduct a functional test of the braking system after repairs and clear any stored codes (10-15 minutes)

Step 4: Conduct a functional test of the braking system after repairs and clear any stored codes (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: Perform a road test to verify that the brakes function correctly under various driving conditions (15-20 minutes)

Step 5: Perform a road test to verify that the brakes function correctly under various driving conditions (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: Brake Pressure Sensor Replacement on a 2017 Chevrolet Silverado

Vehicle: 2017 Chevrolet Silverado, 45,000 miles

Problem: Customer reported the brake warning light was on and experienced spongy brakes.

Diagnosis: Using the GeekOBD APP, the C008B code was confirmed. A visual inspection revealed a faulty brake pressure sensor.

Solution: Replaced the brake pressure sensor and cleared the DTC. Performed a brake fluid flush.

Cost: $250 (sensor $150, labor $100)

Result: The vehicle's braking performance returned to normal, and no further codes were present.

Case Study 2: Wiring Repair for C008B on a 2015 GMC Sierra

Vehicle: 2015 GMC Sierra, 60,000 miles

Problem: Brake warning light was intermittently on, and brakes felt inconsistent.

Diagnosis: Diagnostic testing revealed C008B; inspection showed frayed wiring near the brake pressure sensor.

Solution: Repaired the wiring and replaced connectors where needed.

Cost: $180 (parts $30, labor $150)

Result: Resolved the issue, and the customer reported improved brake responsiveness.

Diagnose C008B

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: C008B
System: Chassis (ABS, Steering, Suspension)
Severity: HIGH
Category: Chassis Codes