← View Generic C3977 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2014 Nissan SENTRA
C3977: C3977: Brake System Pressure Sensor Circuit Malfunction
on 2014 Nissan SENTRA
Fix Cost
$100 - $300
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 C3977 Mean on 2014 Nissan SENTRA?
The brake system pressure sensor circuit has malfunctioned, causing the brake system to malfunction.
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Symptoms
- • Spongy brake pedal
- • low brake fluid level
- • brake warning light on
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Common Causes
- • Faulty brake system pressure sensor
- • faulty wiring harness
- • air in brake system
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How to Fix C3977 on 2014 Nissan SENTRA
1. Check brake fluid level and top off if necessary. 2. Inspect brake system for air leaks. 3. Replace faulty brake system pressure sensor. 4. Inspect and repair or replace faulty wiring harness.
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Need Maintenance Info for Your SENTRA?
Get oil capacity, filter specs, and torque settings for your specific 2014 Nissan SENTRA.
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Essential Tool
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Related Diagnostic Codes
Other codes that may appear with C3977
C3975
Sequential Code
C3975: Wheel Speed Sensor Malfunction
Medium
C3976
Sequential Code
C3976: ABS System Malfunction
Medium
C3978
Sequential Code
C3978: Rear Suspension Control Module (RSCM) Fault
Medium
C3979
Sequential Code
C3979: Steering Column Position Sensor Circuit Malfunction
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