← View Generic B3781 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2019 Ford F150 PICKUP

B3781: B3781: Exterior Lighting Malfunction

on 2019 Ford F150 PICKUP

Fix Cost
$50 - $200
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
2019 Ford
F150 PICKUP
⚠️

Important for 2019 Ford F150 PICKUP Owners

Before starting repairs, verify which engine your 2019 Ford F150 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does B3781 Mean on 2019 Ford F150 PICKUP?

This code indicates a problem with the exterior lighting system, such as a faulty headlight, taillight, or turn signal.
⚠️

Symptoms

  • • Dim or inoperative exterior lights
  • • warning lights on dashboard
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Common Causes

  • • Faulty headlight or taillight bulb
  • • wiring issue
  • • or body control module malfunction
🛠️

How to Fix B3781 on 2019 Ford F150 PICKUP

Replace faulty bulb, inspect and repair wiring, update body control module software

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Parts for 2019 Ford F150 PICKUP

Exterior lighting bulb Shop ↗ Wiring harness Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B3781

B3779 Sequential Code

B3779: Power Window Relay Circuit Malfunction

Medium
B3780 Sequential Code

B3780: Seat Position Sensor Malfunction

Medium
B3782 Sequential Code

B3782: Immobilizer System Malfunction

Medium
B3783 Sequential Code

B3783: 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