← View Generic C3949 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

C3949: C3949: Brake System Pressure Sensor Circuit Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$100 - $500
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2020 Chevrolet
SILVERADO 1500 PICKUP
⚠️

Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners

Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does C3949 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

The brake system pressure sensor circuit has malfunctioned, causing the brake system to malfunction. This can cause the brake pedal to feel spongy or soft.
⚠️

Symptoms

  • • Spongy brake pedal
  • • soft brake pedal
  • • brake pedal feels loose
  • • brake system warning light on
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Common Causes

  • • Faulty brake system pressure sensor
  • • faulty wiring harness
  • • faulty brake master cylinder
  • • air in brake system
🛠️

How to Fix C3949 on 2020 Chevrolet SILVERADO 1500 PICKUP

1. Check brake system pressure sensor for proper function and cleanliness. 2. Check wiring harness for damage or corrosion. 3. Bleed brake system to remove air. 4. Replace faulty brake system pressure sensor or brake master cylinder if necessary.

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Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Brake system pressure sensor Shop ↗ Wiring harness Shop ↗ Brake master cylinder Shop ↗

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Related Diagnostic Codes

Other codes that may appear with C3949

C3947 Sequential Code

C3947: Wheel Speed Sensor Malfunction

Medium
C3948 Sequential Code

C3948: ABS System Malfunction

High
C3950 Sequential Code

C3950: Suspension Damper Solenoid Valve Circuit Malfunction

Medium
C3951 Sequential Code

C3951: Electric Power Steering (EPS) System Fault

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system