← View Generic B1237 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP

B1237: B1237: Low Beam Headlight Relay Circuit Malfunction

on 2020 Chevrolet SILVERADO 1500 PICKUP

Fix Cost
$50 - $150
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
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 B1237 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?

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.
⚠️

Symptoms

  • • Headlights not turning on
  • • dim or flickering lights
  • • warning lights on dashboard
🔍

Common Causes

  • • Faulty headlight relay
  • • wiring issues
  • • blown fuse
  • • headlight switch malfunction
🛠️

How to Fix B1237 on 2020 Chevrolet SILVERADO 1500 PICKUP

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.

🔧

Need Maintenance Info for Your SILVERADO 1500 PICKUP?

Get oil capacity, filter specs, and torque settings for your specific 2020 Chevrolet SILVERADO 1500 PICKUP.

View 2020 Chevrolet SILVERADO 1500 PICKUP Specs

Parts for 2020 Chevrolet SILVERADO 1500 PICKUP

Headlight relay Shop ↗ Wiring harness Shop ↗ Fuse Shop ↗ Headlight switch Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP

Shop Scanners ↗
🔗

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