← View Generic U3873 Guide Severity: Medium
🚗 Vehicle-Specific Guide

This guide is customized for your 2021 Honda PASSPORT

U3873: Network Communication Code U3873 - Gateway

on 2021 Honda PASSPORT

Fix Cost
$50 - $300
Parts & Labor
Difficulty
3/5
1-2 hours
DIY Possible?
✅ Yes
Save money
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 U3873 Mean on 2021 Honda PASSPORT?

Network communication diagnostic trouble code related to gateway communication.
⚠️

Symptoms

  • • Communication errors
  • • module malfunctions
  • • system integration failures
  • • CAN bus issues.
🔍

Common Causes

  • • CAN bus faults
  • • module communication errors
  • • wiring problems
  • • connector corrosion.
🛠️

How to Fix U3873 on 2021 Honda PASSPORT

Check CAN bus integrity, test module communication, repair wiring, clean connectors.

🔧

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

Various - depends on diagnosis Shop ↗

Essential Tool

Must Have

OBD2 Scanner

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Related Diagnostic Codes

Other codes that may appear with U3873

U3871 Sequential Code

Network Communication Code U3871 - CAN Bus

Medium
U3872 Sequential Code

Network Communication Code U3872 - Module Communication

Medium
U3874 Sequential Code

Network Communication Code U3874 - Network Hub

Medium
U3875 Sequential Code

Network Communication Code U3875 - Data Link

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