← View Generic B2645 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2014 Nissan SENTRA
B2645: B2645: Body Control Module (BCM) Malfunction - Exterior Lighting
on 2014 Nissan SENTRA
Fix Cost
$50 - $200
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 B2645 Mean on 2014 Nissan SENTRA?
The Body Control Module (BCM) has detected a malfunction in the exterior lighting system, which may cause issues with turn signals, brake lights, or other exterior lights.
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Symptoms
- • Inoperative or flickering exterior lights
- • turn signal lights not functioning
- • brake lights not illuminating
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Common Causes
- • Faulty BCM
- • wiring issues
- • blown fuse
- • faulty exterior light bulbs
- • or a malfunctioning exterior light switch
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How to Fix B2645 on 2014 Nissan SENTRA
1. Check and replace blown fuses. 2. Inspect and repair wiring issues. 3. Replace faulty exterior light bulbs. 4. Test and replace the BCM if necessary.
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Need Maintenance Info for Your SENTRA?
Get oil capacity, filter specs, and torque settings for your specific 2014 Nissan SENTRA.
View 2014 Nissan SENTRA SpecsParts for 2014 Nissan SENTRA
Essential Tool
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Related Diagnostic Codes
Other codes that may appear with B2645
B2643
Sequential Code
B2643: Power Window Circuit Malfunction
Medium
B2644
Sequential Code
B2644: Seat Position Sensor Circuit Malfunction
Medium
B2646
Sequential Code
B2646: Immobilizer System Malfunction
Medium
B2647
Sequential Code
B2647: Audio System 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