← View Generic B0421 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2019 Ford F150 PICKUP

B0421: B0421: Body Control Module (BCM) Malfunction - Exterior Lighting

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

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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 B0421 Mean on 2019 Ford F150 PICKUP?

The Body Control Module (BCM) has detected a malfunction in the exterior lighting system, which may cause issues with the headlights, taillights, or other exterior lights.

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Symptoms

• Dim or inoperative exterior lights
• faulty headlight aim
• or erratic lighting behavior

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Common Causes

• Faulty BCM
• wiring issues
• blown fuse
• or damaged exterior light bulbs

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How to Fix B0421 on 2019 Ford F150 PICKUP

1. Check and replace blown fuses. 2. Inspect and repair or replace wiring as needed. 3. Test and replace the BCM if necessary. 4. Replace faulty exterior light bulbs.

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Parts for 2019 Ford F150 PICKUP

BCM Shop ↗ fuses Shop ↗ wiring harness Shop ↗ exterior light bulbs Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B0421

B0419 Sequential Code

💡 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