← View Generic B0378 Guide Severity: Medium

🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0378: B0378: Door Lock Actuator Circuit Malfunction

on 2021 Honda PASSPORT

Fix Cost

$100 - $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 B0378 Mean on 2021 Honda PASSPORT?

The B0378 code indicates a malfunction in the door lock actuator circuit, which prevents the door locks from functioning properly.

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Symptoms

• Doors won't lock or unlock
• door lock light on dashboard
• intermittent door lock operation

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Common Causes

• Faulty door lock actuator
• wiring issue
• door lock module failure
• faulty door lock switch

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How to Fix B0378 on 2021 Honda PASSPORT

1. Check door lock actuator for damage or corrosion, replace if necessary. 2. Inspect wiring for damage or shorts, repair or replace as needed. 3. Test door lock module, replace if faulty. 4. Check door lock switch for proper operation, replace if necessary.

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Need Maintenance Info for Your PASSPORT?

Get oil capacity, filter specs, and torque settings for your specific 2021 Honda PASSPORT.

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Parts for 2021 Honda PASSPORT

Door lock actuator Shop ↗ Wiring harness Shop ↗ Door lock module Shop ↗ Door lock switch Shop ↗

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Related Diagnostic Codes

Other codes that may appear with B0378

B0376 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