← View Generic B0400 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

B0400: B0400: Airbag System Fault

on 2021 Honda PASSPORT

Fix Cost
$200 - $1000
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
❌ No
Pro recommended
Your Vehicle
2021 Honda
PASSPORT
⚠️

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 B0400 Mean on 2021 Honda PASSPORT?

The airbag system has detected a fault, which may prevent the airbags from deploying in the event of a crash. This code is often related to issues with the airbag sensors, wiring, or electronic control unit.
⚠️

Symptoms

  • • Airbag warning light on dashboard
  • • airbag system malfunction
  • • possible airbag deployment issues
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Common Causes

  • • Faulty airbag sensor
  • • wiring damage
  • • electronic control unit malfunction
  • • software issue
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How to Fix B0400 on 2021 Honda PASSPORT

1. Check and clear any trouble codes using a scan tool. 2. Inspect and repair any damaged wiring. 3. Replace faulty airbag sensors or electronic control unit if necessary. 4. Update software if a software issue is detected.

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Need Maintenance Info for Your PASSPORT?

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

View 2021 Honda PASSPORT Specs

Parts for 2021 Honda PASSPORT

Airbag sensor Shop ↗ Wiring harness Shop ↗ Electronic control unit Shop ↗ Software update Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 2021 Honda PASSPORT

Shop Scanners ↗
🔗

Related Diagnostic Codes

Other codes that may appear with B0400

B0398 Sequential Code

B0398: Body System Security Malfunction

Medium
B0399 Sequential Code

B0399: Audio System Malfunction

Medium
B0401 Sequential Code

B0401: Climate Control Temperature Sensor Malfunction

Medium
B0402 Sequential Code

B0402: Door Locks Malfunction

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