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

Quick Answer

The B2187 diagnostic trouble code (DTC) for Honda vehicles indicates a problem with the communication line on the driver side Multi-Plex Control System (MPCS) unit, specifically the inability to send UART (Universal Asynchronous Receiver-Transmitter) messages. Common causes include Damaged wiring or connectors in the communication circuit, Faulty driver side MPCS unit, Software malfunction in the control module. 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 Damaged wiring or connectors in the communication circuit, Faulty driver side MPCS unit, Software malfunction in the control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 19, 2024
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Code B2187 Honda Description

The B2187 diagnostic trouble code (DTC) for Honda vehicles indicates a problem with the communication line on the driver side Multi-Plex Control System (MPCS) unit, specifically the inability to send UART (Universal Asynchronous Receiver-Transmitter) messages. The MPCS unit is a crucial component in the vehicle's network system, responsible for managing various functions such as communication between different control modules, monitoring sensors, and controlling actuators. When this code is triggered, it means that there is a communication breakdown on the driver side MPCS unit, which can lead to a range of issues affecting the vehicle's performance and functionality.

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

Common Causes of B2187 Honda

  1. Damaged wiring or connectors in the communication circuit.
  2. Faulty driver side MPCS unit.
  3. Software malfunction in the control module.
  4. Corrosion or moisture intrusion in the communication system.
  5. Electrical interference from aftermarket accessories or modifications.

Symptoms of B2187 Honda

  1. Malfunction indicator light (MIL) or check engine light illuminated on the dashboard.
  2. Loss of communication with certain control modules, resulting in non-functioning systems.
  3. Erratic behavior of safety features like airbags or stability control.
  4. Transmission shifting issues or abnormal engine performance.
  5. Inability to access certain functions through the vehicle's onboard computer system.

How to Fix B2187 Honda

  1. Begin by conducting a thorough inspection of the communication circuit, checking for damaged wiring, loose connections, or corrosion.
  2. Use a diagnostic scan tool to communicate with the driver side MPCS unit and other control modules to identify the source of the communication error.
  3. If necessary, replace the driver side MPCS unit with a new or refurbished unit to restore proper communication.
  4. Clear the DTC from the vehicle's memory and perform a system reset to ensure all modules are communicating correctly.
  5. Test drive the vehicle to verify that the issue has been resolved and that all systems are functioning properly.

Cost to Fix B2187 Honda

The cost of repairing a communication line issue on the driver side MPCS unit can vary depending on the extent of the damage, the need for replacement parts, and the labor involved. In general, the repair costs for this type of issue can range from $200 to $500, including parts and labor. However, it's essential to note that specific diagnosis time and labor rates at auto repair shops can fluctuate based on factors such as location, vehicle make and model, and engine type. It's recommended to inquire about local rates to get a more accurate estimate for this repair.

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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.

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