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Engine-Codes – Generic – U128F

U128F Code - Gauge Control Module Lost Communication With BSI Radar Unit

Quick Answer

The diagnostic trouble code U128F indicates that the Gauge Control Module (GCM) has lost communication with the Blind Spot Information (BSI) Radar Unit in the vehicle. Common causes include Faulty wiring or connections between the GCM and BSI Radar Unit, Malfunctioning GCM or BSI Radar Unit, Software issues affecting communication between the two modules. 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
U128F indicates Gauge Control Module Lost Communication With BSI Radar Unit.
Common causes
Common causes include Faulty wiring or connections between the GCM and BSI Radar Unit, Malfunctioning GCM or BSI Radar Unit, Software issues affecting communication between the two modules.
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 11, 2024
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Code U128F Description

The diagnostic trouble code U128F indicates that the Gauge Control Module (GCM) has lost communication with the Blind Spot Information (BSI) Radar Unit in the vehicle. The GCM is responsible for controlling various gauges and indicators on the vehicle's dashboard, while the BSI Radar Unit is a component of the advanced driver assistance system that helps detect vehicles in the blind spot areas.

OBDII Code U128F - Gauge Control Module Lost Communication With BSI Radar Unit
U128F Code - Gauge Control Module Lost Communication With BSI Radar Unit

Common Causes of U128F

  1. Faulty wiring or connections between the GCM and BSI Radar Unit.
  2. Malfunctioning GCM or BSI Radar Unit.
  3. Software issues affecting communication between the two modules.
  4. Water or moisture intrusion causing corrosion in the electrical connections.
  5. Physical damage to the wiring harness or components involved in the communication system.

Symptoms of U128F

  1. Dashboard gauges not functioning properly or displaying incorrect readings.
  2. Warning lights related to the BSI Radar system appearing on the dashboard.
  3. Loss of functionality in the blind spot monitoring system.
  4. Inconsistent or erratic behavior of the vehicle's gauges and indicators.

How to Fix U128F

  1. Perform a diagnostic scan to confirm the U128F code and identify the specific issue.
  2. Inspect the wiring harness and connections between the GCM and BSI Radar Unit for any damage or corrosion.
  3. Test the GCM and BSI Radar Unit for proper functionality and communication.
  4. Repair or replace any damaged wiring, connectors, or components as necessary.
  5. Clear the diagnostic trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U128F

The cost of repairing a U128F code can vary depending on the specific cause of the communication error. On average, you can expect to pay between $200 and $500 for parts and labor. However, prices may differ based on the location, make and model of the vehicle, and the rates charged by the auto repair shop. It is recommended to consult with a professional mechanic for a more accurate estimate.

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Code U128F Information for Specific Makes

  • U128F Acura — Gauge Control Module Lost Communication With BSI Radar Unit
  • U128F Honda — Gauge Control Module Lost Communication With BSI Radar Unit
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 U128F Code

1. What are the common symptoms of OBDII code U128F?

- Common symptoms include issues with the radar unit, malfunctioning gauge control module, warning lights on the dashboard, and potential loss of communication between the two components.

2. What does the U128F code indicate?

- The U128F code indicates that there is a communication problem between the gauge control module and the BSI radar unit in the vehicle.

3. What are some possible causes of code U128F?

- Possible causes include damaged wiring or connectors, a faulty gauge control module or radar unit, software issues, or a power supply problem.

4. How do I diagnose the U128F code?

- Diagnosing the U128F code typically involves checking the wiring and connectors for damage, testing the components involved, and using a diagnostic tool to communicate with the modules.

5. Can I still drive my vehicle with the U128F code present?

- It is not recommended to drive the vehicle with the U128F code present, as it can lead to safety issues and affect the performance of certain driver assistance systems.

6. How can I repair the U128F code?

- Repairing the U128F code may involve repairing or replacing damaged wiring, connectors, or components, updating software, or reprogramming the modules involved.

7. Do I need special tools to fix the U128F code?

- Yes, diagnosing and repairing the U128F code may require special diagnostic tools to communicate with the modules and perform necessary tests and repairs.

8. Can a DIY enthusiast fix the U128F code?

- While some basic troubleshooting steps can be taken by a DIY enthusiast, fixing the U128F code often requires advanced knowledge and specialized equipment, so it is recommended to seek professional help.

9. How much does it cost to repair the U128F code?

- The cost of repairing the U128F code can vary depending on the extent of the issue, the parts needed, and labor costs. It is advisable to get a diagnosis from a professional technician for an accurate estimate.

10. Is the U128F code a common issue in certain vehicle models?

- The U128F code can be more prevalent in vehicles equipped with advanced driver assistance systems that rely on communication between various modules, such as radar units and gauge control modules.

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