← View Generic C3949 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2014 Nissan SENTRA

C3949: C3949: Brake System Pressure Sensor Circuit Malfunction

on 2014 Nissan SENTRA

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

❌ No

Pro recommended

Your Vehicle

2014 Nissan

SENTRA

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Important for 2014 Nissan SENTRA Owners

Before starting repairs, verify which engine your 2014 Nissan SENTRA has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does C3949 Mean on 2014 Nissan SENTRA?

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.

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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

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How to Fix C3949 on 2014 Nissan SENTRA

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 2014 Nissan SENTRA

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

Essential Tool

Must Have

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Related Diagnostic Codes

Other codes that may appear with C3949

C3947 Sequential Code

💡 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