AutoCodes – Honda – B1900 Honda

B1900 Honda Code - Communication Bus Line Error

Quick Answer

The Multiplex Integrated Control Unit (MICU) has encountered a Communication Bus Line Error with other control units. Common causes include Faulty Multiplex Integrated Control Unit (MICU), Multiplex Integrated Control Unit (MICU) harness is open or shorted, Multiplex Integrated Control Unit (MICU) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1900 Honda indicates Communication Bus Line Error.
Common causes: Common causes include Faulty Multiplex Integrated Control Unit (MICU), Multiplex Integrated Control Unit (MICU) harness is open or shorted, Multiplex Integrated Control Unit (MICU) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,494

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1900 Honda Description

The Multiplex Integrated Control Unit (MICU) has encountered a Communication Bus Line Error with other control units.

OBDII Code B1900 Honda - Communication Bus Line Error - AutoCodes.com — B1900 Honda Code - Communication Bus Line Error

What does this mean?

What are the Possible Causes of the DTC B1900 Honda?

Faulty Multiplex Integrated Control Unit (MICU)
Multiplex Integrated Control Unit (MICU) harness is open or shorted
Multiplex Integrated Control Unit (MICU) circuit poor electrical connection

How to Fix the DTC B1900 Honda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1900 Honda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1900 Honda code?

Need more information on how to fix the B1900 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1900 Honda code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1900 Honda Code

1. What does OBDII code B1900 in a Honda mean?

The B1900 code indicates a Communication Bus Line Error in the vehicle's network system.

2. What are the common symptoms of a B1900 code in a Honda?

Common symptoms include issues with various electronic components, such as the radio, navigation system, or dashboard display not functioning properly.

3. What can cause the B1900 Communication Bus Line Error code in a Honda?

Potential causes of this code include loose or damaged wiring, faulty control modules, or a communication network issue within the vehicle.

4. How can I diagnose a B1900 code in my Honda?

Diagnosing the B1900 code usually requires using a diagnostic scanner to check for other related trouble codes and investigating the vehicle's communication network for faults.

5. Can I drive my Honda with a B1900 code present?

It is not recommended to drive the vehicle with a B1900 code, as it can lead to further electrical problems and potential safety issues.

6. How can I repair a B1900 code in my Honda?

Repairing a B1900 code often involves inspecting and repairing any damaged wiring, ensuring all control modules are properly connected, and resetting the error code with a diagnostic tool.

7. Do I need specialized tools to fix the B1900 code in my Honda?

While basic tools may be sufficient for inspecting wiring and connections, diagnosing and repairing a B1900 code may require specialized diagnostic equipment typically found in automotive repair shops.

8. Can a DIY enthusiast fix the B1900 code in a Honda at home?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the B1900 code by following detailed repair guides or seeking assistance from online forums.

9. Is it common for the B1900 code to reoccur in a Honda after repairs?

If the root cause of the B1900 code is not properly addressed during repairs, it is possible for the code to reoccur. Thorough diagnosis and repair are essential to prevent this from happening.

10. Should I reset the B1900 code in my Honda after fixing the issue?

It is recommended to reset the B1900 code using a diagnostic scanner after completing repairs to ensure the issue has been resolved and to clear any lingering error codes in the system.