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Engine-Codes – Generic – B124A

B124A Code - Automatic High Beam Mirror

Quick Answer

The B124A code relates to an issue with the automatic high beam mirror system in the vehicle. Common causes include Faulty automatic high beam mirror sensor, Wiring issues or electrical connections related to the automatic high beam mirror system, Malfunctioning automatic high beam mirror 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
B124A indicates Automatic High Beam Mirror.
Common causes
Common causes include Faulty automatic high beam mirror sensor, Wiring issues or electrical connections related to the automatic high beam mirror system, Malfunctioning automatic high beam mirror 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 07, 2024
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Code B124A Description

The B124A code relates to an issue with the automatic high beam mirror system in the vehicle. The automatic high beam mirror is a feature that automatically adjusts the vehicle's high beam headlights based on surrounding light conditions. When this code is triggered, it indicates a problem with the functionality of the automatic high beam mirror system.

OBDII Code B124A - Automatic High Beam Mirror
B124A Code - Automatic High Beam Mirror

Common Causes of B124A

  1. Faulty automatic high beam mirror sensor.
  2. Wiring issues or electrical connections related to the automatic high beam mirror system.
  3. Malfunctioning automatic high beam mirror control module.
  4. Software glitch in the vehicle's onboard computer system.
  5. Physical damage to the automatic high beam mirror components.

Symptoms of B124A

  1. High beams not automatically adjusting based on surrounding light conditions.
  2. Inconsistent or erratic behavior of the automatic high beam mirror system.
  3. Dashboard warning light indicating a fault with the automatic high beam mirror.
  4. Reduced visibility at night due to the high beams not functioning correctly.

How to Fix B124A

  1. Diagnose the issue using a diagnostic scanner to retrieve the specific fault code (B124A) and identify the underlying cause of the problem.
  2. Inspect the automatic high beam mirror sensor, wiring, and control module for any visible damage or signs of malfunction.
  3. Repair or replace any faulty components, such as the sensor, wiring harness, or control module, as needed.
  4. Clear the fault code from the vehicle's onboard computer system and test the automatic high beam mirror system to ensure proper functionality.
  5. If the issue persists, further troubleshooting may be required to pinpoint the exact cause of the problem and address it accordingly.

Cost to Fix B124A

The cost of repairing the automatic high beam mirror system related to the B124A code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the typical repair costs for this type of issue can range from $200 to $500, including parts and labor.

What does this mean?

Tech Notes for B124A

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera that was installed on another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

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Code B124A Information for Specific Makes

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 B124A Code

1. What does the OBDII code B124A mean?

The B124A code indicates an issue with the Automatic High Beam Mirror system, which is responsible for controlling automatic high beam functionality based on driving conditions.

2. What are the common symptoms of the B124A code?

Symptoms include the automatic high beam feature not functioning, high beams staying on or not activating automatically, and potential warning lights on the dashboard.

3. What causes the B124A code to appear?

Common causes include a malfunctioning high beam mirror sensor, wiring or connector issues, or software glitches in the vehicle's lighting control module.

4. Can a dirty windshield cause the B124A code?

Yes, a dirty or damaged windshield can obstruct the sensor's view and trigger the B124A code by affecting the automatic high beam system's performance.

5. How is the B124A code diagnosed?

A mechanic typically uses an OBDII scanner to retrieve the code and checks the high beam mirror sensor, wiring, and connectors for damage or faults.

6. Can I still drive my car with the B124A code?

Yes, you can usually drive with this code, but the automatic high beam feature may not work, requiring manual control of your high beams.

7. How do you fix the B124A code?

Repairs may involve cleaning or replacing the high beam mirror sensor, fixing damaged wiring, clearing obstructions, or updating the lighting control module software.

8. How much does it cost to repair the B124A code?

Repair costs vary depending on the issue, ranging from $50 for a simple sensor cleaning to over $200 for sensor replacement or wiring repairs.

9. Can resetting the system clear the B124A code?

In some cases, disconnecting the battery or using an OBDII scanner to reset the system may temporarily clear the code, but the underlying issue must be addressed to prevent recurrence.

10. How can I prevent the B124A code from occurring?

Regularly clean your windshield, ensure the high beam mirror sensor is unobstructed, and maintain your vehicle's electrical system to help prevent this code.

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