← View Generic B1237 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2014 Nissan SENTRA
B1237: B1237: Low Beam Headlight Relay Circuit Malfunction
on 2014 Nissan SENTRA
Fix Cost
$50 - $150
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
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 B1237 Mean on 2014 Nissan SENTRA?
The B1237 code indicates a problem with the low beam headlight relay circuit, which controls the low beam headlights. This can cause the headlights to malfunction or not turn on.
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Symptoms
- • Headlights not turning on
- • dim or flickering lights
- • warning lights on dashboard
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Common Causes
- • Faulty headlight relay
- • wiring issues
- • blown fuse
- • headlight switch malfunction
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How to Fix B1237 on 2014 Nissan SENTRA
1. Check and replace the headlight relay if faulty. 2. Inspect and repair any wiring issues. 3. Check and replace the fuse if blown. 4. Test and replace the headlight switch if malfunctioning.
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Need Maintenance Info for Your SENTRA?
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Related Diagnostic Codes
Other codes that may appear with B1237
B1235
Sequential Code
B1235: Power Window Relay Circuit Malfunction
Medium
B1236
Sequential Code
B1236: Seat Switch Circuit Malfunction
Medium
B1238
Sequential Code
B1238: Immobilizer System Malfunction
Medium
B1239
Sequential Code
B1239: Audio 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