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U12B7 Honda Code - Millimeter Wave Radar Local CAN Malfunction

Quick Answer

The U12B7 diagnostic trouble code (DTC) for Honda vehicles refers to a "Millimeter Wave Radar Local CAN Malfunction." This code indicates an issue with the millimeter wave radar system, which is a crucial component of the vehicle's advanced driver assistance systems (ADAS). Common causes include Damaged wiring or connectors in the radar system, Corrosion or moisture ingress affecting the radar unit, Faulty radar sensor or 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
U12B7 Honda indicates Millimeter Wave Radar Local CAN Malfunction.
Common causes
Common causes include Damaged wiring or connectors in the radar system, Corrosion or moisture ingress affecting the radar unit, Faulty radar sensor or 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 09, 2024
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Code U12B7 Honda Description

The U12B7 diagnostic trouble code (DTC) for Honda vehicles refers to a "Millimeter Wave Radar Local CAN Malfunction." This code indicates an issue with the millimeter wave radar system, which is a crucial component of the vehicle's advanced driver assistance systems (ADAS). The radar system uses millimeter wave technology to detect objects in the vehicle's vicinity, providing important data for features such as adaptive cruise control, collision avoidance systems, and automatic emergency braking.

OBDII Code U12B7 Honda - Millimeter Wave Radar Local CAN Malfunction
U12B7 Honda Code - Millimeter Wave Radar Local CAN Malfunction

Common Causes of U12B7 Honda

  1. Damaged wiring or connectors in the radar system
  2. Corrosion or moisture ingress affecting the radar unit
  3. Faulty radar sensor or control module
  4. Software glitches or communication errors within the CAN network
  5. Impact damage to the radar unit from external elements or accidents

Symptoms of U12B7 Honda

  1. Warning lights illuminated on the dashboard related to the radar system
  2. Inaccurate or erratic behavior of ADAS features such as adaptive cruise control
  3. Loss of functionality in collision avoidance systems
  4. Reduced performance of automatic emergency braking
  5. Unresponsive radar system during calibration or initialization processes

How to Fix U12B7 Honda

  1. Perform a comprehensive diagnostic scan to retrieve the specific DTC and identify the root cause of the malfunction.
  2. Inspect the wiring harness, connectors, and radar unit for any visible damage or corrosion.
  3. Test the radar sensor and control module for proper functionality and communication.
  4. Clear the DTC and reset the system to see if the issue reoccurs after repairs.
  5. Replace any faulty components, repair damaged wiring, and ensure proper calibration of the radar system to restore functionality.

Cost to Fix U12B7 Honda

The typical repair costs for addressing a U12B7 Honda DTC can range from $200 to $800, depending on the extent of the damage and the need for replacement parts. This estimate includes labor costs, which can vary based on the specific diagnosis time and hourly rates at auto repair shops. It's advisable to consult with a qualified technician or service center to get a more accurate estimate tailored to your vehicle's make, model, and location.

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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 U12B7 Honda Code

1. What are the common symptoms of OBDII code U12B7 Honda (Millimeter Wave Radar Local CAN Malfunction)?

The common symptoms of this code may include issues with the adaptive cruise control system, malfunctioning radar sensors, and warning lights on the dashboard.

2. What can cause the U12B7 Honda code to appear?

The U12B7 code typically appears due to a malfunction in the millimeter wave radar system, faulty radar sensors, damaged wiring, or issues with the local Controller Area Network (CAN) communication network.

3. How can I diagnose the Millimeter Wave Radar Local CAN Malfunction in a Honda vehicle?

Diagnosing this issue usually involves using a diagnostic scanner to read the specific U12B7 trouble code, inspecting the radar sensors and wiring for any visible damage, and performing a CAN bus communication test.

4. Is it safe to drive with the U12B7 error code present?

It is not recommended to drive the vehicle with the U12B7 code active, as it can affect the proper functioning of the radar-based safety systems like adaptive cruise control, collision mitigation braking, and lane keep assist.

5. Can I repair the U12B7 Honda code on my own?

Repairing the U12B7 code may require advanced diagnostic tools and expertise due to the complexity of the radar system. It is often best to consult a professional mechanic or dealership for proper diagnosis and repair.

6. How much does it typically cost to fix the Millimeter Wave Radar Local CAN Malfunction in a Honda?

The cost of fixing the U12B7 error code can vary depending on the root cause of the issue, parts needed for replacement, and labor charges. It is advisable to get a few quotes from different repair shops.

7. Will resetting the trouble codes make the U12B7 code disappear permanently?

Resetting the trouble codes may temporarily clear the U12B7 code, but if the underlying issue is not fixed, the code is likely to reappear once the system detects the problem again.

8. Can extreme weather conditions trigger the U12B7 Honda fault code?

Extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially impact the radar sensors and contribute to the U12B7 error code appearing in Honda vehicles.

9. Are there any recalls related to the U12B7 Honda code?

It is advisable to check with Honda or the National Highway Traffic Safety Administration (NHTSA) for any recalls or technical service bulletins related to the U12B7 code affecting specific Honda models.

10. How long does it usually take to repair the Millimeter Wave Radar Local CAN Malfunction issue?

The repair time for the U12B7 code can vary depending on the exact cause of the problem and the availability of parts. It is recommended to consult with a professional technician for an accurate estimate.

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