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B1157 Acura Code - Gauge Control Module Lost Communication With Multiplex Integrated Control Unit

Quick Answer

The B1157 diagnostic trouble code for Acura vehicles indicates that there is a communication error between the Gauge Control Module (GCM) and the Multiplex Integrated Control Unit (MICU). Common causes include Loose or corroded wiring connections between the GCM and MICU, Faulty communication lines between the two modules, A malfunctioning Gauge Control Module or Multiplex Integrated Control Unit. 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
B1157 Acura indicates Gauge Control Module Lost Communication With Multiplex Integrated Control Unit .
Common causes
Common causes include Loose or corroded wiring connections between the GCM and MICU, Faulty communication lines between the two modules, A malfunctioning Gauge Control Module or Multiplex Integrated Control Unit.
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 15, 2024
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Code B1157 Acura Description

The B1157 diagnostic trouble code for Acura vehicles indicates that there is a communication error between the Gauge Control Module (GCM) and the Multiplex Integrated Control Unit (MICU). The GCM is responsible for controlling various gauges and indicators on the vehicle's instrument cluster, while the MICU serves as a central hub for communication between different control modules in the vehicle. When these two modules are unable to communicate effectively, it can lead to issues with the vehicle's instrument cluster functionality.

OBDII Code B1157 Acura - Gauge Control Module Lost Communication With Multiplex Integrated Control Unit
B1157 Acura Code - Gauge Control Module Lost Communication With Multiplex Integrated Control Unit

Common Causes of B1157 Acura

  1. Loose or corroded wiring connections between the GCM and MICU.
  2. Faulty communication lines between the two modules.
  3. A malfunctioning Gauge Control Module or Multiplex Integrated Control Unit.
  4. Electrical issues such as a blown fuse affecting communication.

Symptoms of B1157 Acura

  1. Inaccurate or erratic gauge readings on the instrument cluster.
  2. Warning lights on the instrument cluster may illuminate unexpectedly.
  3. Loss of communication with other control modules in the vehicle.
  4. Intermittent or complete loss of instrument cluster functionality.

How to Fix B1157 Acura

  1. Begin by conducting a thorough visual inspection of the wiring connections between the GCM and MICU. Ensure all connections are secure and free of corrosion.
  2. Use a multimeter to test the continuity of the communication lines between the two modules. Replace any damaged or faulty wiring as needed.
  3. If the wiring and connections are in good condition, the next step is to diagnose the GCM and MICU for any internal faults. This may involve using a diagnostic scan tool to retrieve specific error codes and data.
  4. Depending on the diagnosis, repair or replace the faulty Gauge Control Module or Multiplex Integrated Control Unit.
  5. After completing the repair, clear the diagnostic trouble codes and perform a test drive to ensure the instrument cluster functions correctly.

Cost to Fix B1157 Acura

The typical repair costs for addressing the B1157 code on Acura vehicles can vary depending on the specific cause of the communication error. On average, the parts and labor for this repair may range from $200 to $500. It's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates typically range between $80 and $150 per hour, with higher rates in metropolitan areas or at dealerships and lower rates at independent shops. For a more precise estimate, it's advisable to consult local auto repair shops.

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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 B1157 Acura Code

1. What are the common symptoms of OBDII code B1157 in an Acura?

- Common symptoms include loss of communication with the multiplex integrated control unit, malfunctioning gauge control module, and dashboard instrument cluster issues.

2. What causes the Gauge Control Module to lose communication with the Multiplex Integrated Control Unit in an Acura?

- The most common causes are wiring issues, a faulty gauge control module, a malfunctioning multiplex integrated control unit, or a communication network problem within the vehicle.

3. How can I diagnose the cause of OBDII code B1157 in my Acura?

- Diagnosis typically involves checking the wiring connections between the gauge control module and the multiplex integrated control unit, testing the modules for proper functionality, and scanning the vehicle's network for communication errors.

4. Can a DIY enthusiast repair OBDII code B1157 in an Acura?

- Depending on the root cause, some DIY repairs may be possible, such as checking and repairing wiring connections. However, diagnosing and repairing electronic module issues may require professional assistance.

5. Is it safe to drive my Acura with OBDII code B1157 present?

- It is not recommended to drive your Acura with this code present, as it may lead to inaccurate gauge readings or other electrical issues that could affect the vehicle's performance and safety.

6. How much does it cost to repair OBDII code B1157 in an Acura?

- The cost of repair can vary depending on the exact cause of the issue. It may range from a simple wiring repair cost to the replacement of electronic modules, which could be more expensive.

7. Can resetting the OBDII code B1157 clear the issue temporarily?

- Resetting the code may temporarily clear the issue, but it is likely to return if the root cause of the communication problem between the gauge control module and the multiplex integrated control unit is not resolved.

8. Can a software update fix OBDII code B1157 in an Acura?

- In some cases, a software update may address communication issues between modules, so it's worth checking with your dealership or a qualified technician to see if an update is available for your specific model.

9. Are there any preventive maintenance tips to avoid OBDII code B1157 in the future?

- Regularly checking and maintaining the electrical connections in your vehicle, as well as following the manufacturer's recommended service intervals, can help prevent communication issues that lead to OBDII code B1157.

10. How long does it take to repair OBDII code B1157 in an Acura?

- The repair time can vary depending on the diagnostic process and the complexity of the issue. It may range from a few hours to a day or more, especially if electronic modules need to be replaced or reprogrammed.

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