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B2155 Honda Code - Driver Side MPCS Unit Lost Communication With MICU

Quick Answer

The B2155 Honda code indicates that there is a communication issue between the driver side Multiplex Control System (MPCS) unit and the Multiplex Integrated Control Unit (MICU) in the vehicle. Common causes include Faulty wiring or connectors between the MPCS unit and MICU, Corrosion or damage to the electrical connections, Defective MPCS unit or MICU. 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
B2155 Honda indicates Driver Side MPCS Unit Lost Communication With MICU.
Common causes
Common causes include Faulty wiring or connectors between the MPCS unit and MICU, Corrosion or damage to the electrical connections, Defective MPCS unit or MICU.
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 10, 2024
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Code B2155 Honda Description

The B2155 Honda code indicates that there is a communication issue between the driver side Multiplex Control System (MPCS) unit and the Multiplex Integrated Control Unit (MICU) in the vehicle. The MPCS unit is responsible for controlling various electrical components on the driver side of the car, such as power windows, mirrors, and door locks. The MICU acts as a central control unit for the vehicle's electrical systems, receiving and transmitting signals to different modules and sensors.

OBDII Code B2155 Honda - Driver Side MPCS Unit Lost Communication With MICU
B2155 Honda Code - Driver Side MPCS Unit Lost Communication With MICU

Common Causes of B2155 Honda

  1. Faulty wiring or connectors between the MPCS unit and MICU.
  2. Corrosion or damage to the electrical connections.
  3. Defective MPCS unit or MICU.
  4. Software issues causing a communication breakdown.
  5. Impact or physical damage to the driver side components affecting communication.

Symptoms of B2155 Honda

  1. Power windows on the driver side not working.
  2. Inability to adjust driver side mirrors electronically.
  3. Door locks not responding to the central locking system.
  4. Interior lights on the driver side malfunctioning.
  5. Warning light illuminated on the dashboard related to the electrical system.

How to Fix B2155 Honda

  1. Begin by conducting a thorough inspection of the wiring and connectors between the MPCS unit and MICU. Repair or replace any damaged wiring or connectors.
  2. Check for any corrosion on the electrical connections and clean them properly.
  3. If the issue persists, test the MPCS unit and MICU for functionality. Replace any defective units.
  4. Perform a software update or reprogramming of the control units to ensure proper communication.
  5. Clear the diagnostic trouble codes and test the system to verify that the communication issue has been resolved.

Cost to Fix B2155 Honda

The cost of repairing a communication issue between the driver side MPCS unit and MICU can vary depending on the extent of the problem and the specific components that need to be replaced. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Additionally, the cost may be higher at dealerships or in metropolitan areas. It is recommended to obtain a detailed quote from a trusted mechanic to get an 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 B2155 Honda Code

1. What are the common symptoms of OBDII code B2155 in a Honda related to the Driver Side MPCS Unit Lost Communication With MICU?

- Common symptoms include non-functioning driver side power window, door locks, or mirror controls.

2. What are the possible causes of OBDII code B2155 in a Honda?

- The code may be triggered by a faulty driver side Multiplex Control System (MPCS) unit or a communication issue with the Multiplex Integrated Control Unit (MICU).

3. How can I diagnose the Driver Side MPCS Unit Lost Communication With MICU issue in my Honda?

- Use a diagnostic scanner to retrieve the specific trouble code (B2155) and conduct a thorough inspection of the MPCS unit wiring and connections.

4. Can a DIY enthusiast repair the OBDII code B2155 issue in a Honda themselves?

- Repairing this issue may require advanced knowledge and specialized tools, so it's recommended to consult a professional automotive technician for proper diagnosis and repair.

5. Is it safe to continue driving my Honda with the B2155 trouble code present?

- Driving with this issue may lead to further electrical problems or malfunctions, so it's advisable to address the problem promptly to avoid safety hazards.

6. How much does it typically cost to repair the Driver Side MPCS Unit Lost Communication With MICU problem in a Honda?

- Repair costs can vary based on the extent of the issue, but expect to pay for diagnostic time, parts replacement, and labor charges from a repair shop.

7. Are there any preventive measures to avoid encountering the B2155 trouble code in a Honda?

- Keeping up with regular vehicle maintenance, including checking electrical components, can help prevent issues like the Driver Side MPCS Unit Lost Communication With MICU.

8. Can a weak car battery cause the OBDII code B2155 to appear in a Honda?

- A weak battery can potentially impact the communication between control units, leading to error codes like B2155. Ensuring a properly functioning battery is essential for overall vehicle health.

9. Will resetting the OBDII code B2155 in my Honda make the issue go away permanently?

- Simply clearing the code without addressing the underlying problem will not resolve the issue. It's crucial to diagnose and repair the root cause to prevent the code from reoccurring.

10. Is the Driver Side MPCS Unit Lost Communication With MICU issue a common problem in Honda vehicles?

- While it may not be extremely common, issues related to communication between control units can occur in various Honda models, requiring proper diagnosis and repair.

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