AutoCodes – Honda – B2187 Honda

B2187 Honda Code - Communication Line Driver Side MPCS Unit Cannot Send UART Messages

Quick Answer

The Driver Side Multiplex Control System (MPCS) communication line Cannot Send UART Messages. Common causes include Faulty Driver Side Multiplex Control System (MPCS), Driver Side Multiplex Control System (MPCS) harness is open or shorted, Driver Side Multiplex Control System (MPCS) 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: B2187 Honda indicates Communication Line Driver Side MPCS Unit Cannot Send UART Messages.
Common causes: Common causes include Faulty Driver Side Multiplex Control System (MPCS), Driver Side Multiplex Control System (MPCS) harness is open or shorted, Driver Side Multiplex Control System (MPCS) 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 1,554

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2187 Honda Description

The Driver Side Multiplex Control System (MPCS) communication line Cannot Send UART Messages.

OBDII Code B2187 Honda - Communication Line Driver Side MPCS Unit Cannot Send UART Messages - AutoCodes.com — B2187 Honda Code - Communication Line Driver Side MPCS Unit Cannot Send UART Messages

What does this mean?

What are the Possible Causes of the DTC B2187 Honda?

Faulty Driver Side Multiplex Control System (MPCS)
Driver Side Multiplex Control System (MPCS) harness is open or shorted
Driver Side Multiplex Control System (MPCS) circuit poor electrical connection

How to Fix the DTC B2187 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 B2187 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 B2187 Honda code?

Need more information on how to fix the B2187 Honda code? Get Access to Factory Service Manuals

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Get the B2187 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 B2187 Honda Code

1. What are the common symptoms of OBDII code B2187 in a Honda related to the Communication Line Driver Side MPCS Unit?

The common symptoms include the malfunction indicator light (MIL) turning on, communication issues with the MPCS unit, and potential issues with the vehicle's stability control system.

2. What could cause the OBDII code B2187 in a Honda related to the Communication Line Driver Side MPCS Unit?

Possible causes of this code include a faulty MPCS unit, damaged wiring or connectors in the communication line, a defective driver side MPCS unit, or a software glitch.

3. How can I diagnose the Communication Line Driver Side MPCS Unit issue triggering code B2187 in my Honda?

Diagnosing this issue involves using a professional OBDII scanner to retrieve the specific code, checking the communication lines for continuity and proper voltage, inspecting the MPCS unit for any visible damage, and conducting a thorough inspection of wiring and connectors.

4. Can I repair the Communication Line Driver Side MPCS Unit issue causing code B2187 in my Honda by myself?

Depending on your skill level and access to tools, you may be able to repair this issue yourself by replacing the faulty MPCS unit, repairing damaged wiring or connectors, or updating the software if a glitch is suspected. However, seeking professional help is recommended for accurate diagnosis and proper repair.

5. Are there any precautions I should take when working on the Communication Line Driver Side MPCS Unit issue related to OBDII code B2187 in my Honda?

When working on electrical components like the MPCS unit or communication lines, it is essential to disconnect the vehicle's battery to prevent short circuits, follow proper safety procedures, and consult the vehicle's service manual for guidance.

6. Is it safe to continue driving my Honda with the OBDII code B2187 related to the Communication Line Driver Side MPCS Unit issue?

It is not recommended to drive your vehicle with unresolved communication line issues, as it can affect the stability control system and potentially compromise safety. It's best to address the problem promptly to ensure the proper functioning of essential vehicle systems.

7. How do I reset the OBDII code B2187 in my Honda after fixing the Communication Line Driver Side MPCS Unit issue?

After repairing the underlying issue causing the code, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the error code from the system.

8. Can extreme weather conditions affect the Communication Line Driver Side MPCS Unit issue triggering code B2187 in my Honda?

Extreme weather conditions can potentially exacerbate existing electrical problems, so it's essential to keep your vehicle protected and address any issues promptly to prevent further damage. Insulating vulnerable components may also help prevent weather-related issues.

9. How can I prevent the OBDII code B2187 related to the Communication Line Driver Side MPCS Unit issue from recurring in my Honda?

To prevent code B2187 from recurring, regularly inspect and maintain the vehicle's electrical components, ensure proper wiring connections, avoid water damage, and address any warning signs promptly to prevent more significant issues down the line.

10. Are there any recalls or technical service bulletins related to the OBDII code B2187 in Honda vehicles with Communication Line Driver Side MPCS Unit problems?

It's advisable to check with Honda's official website or contact a dealership to inquire about any recalls or technical service bulletins related to code B2187 in your specific Honda model. Following manufacturer recommendations and updates can help address known issues effectively.