← View Generic B3851 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B3851: B3851: Power Window Regulator Malfunction

on 2021 Honda PASSPORT

Fix Cost

$150 - $300

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

❌ No

Pro recommended

Your Vehicle

2021 Honda

PASSPORT

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Important for 2021 Honda PASSPORT Owners

Before starting repairs, verify which engine your 2021 Honda PASSPORT has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does B3851 Mean on 2021 Honda PASSPORT?

The power window regulator is malfunctioning, preventing the window from moving up or down properly.

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Symptoms

• Window stuck
• won't move
• or moves erratically
• may have a grinding or screeching noise

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Common Causes

• Faulty power window regulator
• worn-out or damaged window tracks
• faulty window switch

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How to Fix B3851 on 2021 Honda PASSPORT

1. Disconnect battery to prevent accidental window movement. 2. Remove door panel and window regulator assembly. 3. Inspect and clean window tracks. 4. Replace faulty window regulator or tracks if damaged. 5. Reassemble and test window operation.

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Parts for 2021 Honda PASSPORT

Power window regulator Shop ↗ Window tracks Shop ↗

Essential Tool

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Related Diagnostic Codes

Other codes that may appear with B3851

B3849 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