AutoCodes – Subaru – B2900 Subaru

B2900 Subaru Code - Auto Headlight Control

Quick Answer

The Diagnostic Trouble Code (DTC) is set when an internal malfunction occurs in the Auto Headlight Beam Leveler Control Module. Common causes include Faulty Auto Headlight Beam Leveler Control Module, Auto Headlight Beam Leveler Control Module harness is open or shorted, Auto Headlight Beam Leveler Control Module circuit poor electrical connection. 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: B2900 Subaru indicates Auto Headlight Control.
Common causes: Common causes include Faulty Auto Headlight Beam Leveler Control Module, Auto Headlight Beam Leveler Control Module harness is open or shorted, Auto Headlight Beam Leveler Control Module circuit poor electrical connection.
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.

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Code Popularity 2,909

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2900 Subaru Description

The Diagnostic Trouble Code (DTC) is set when an internal malfunction occurs in the Auto Headlight Beam Leveler Control Module.

OBDII Code B2900 Subaru - Auto Headlight Control - AutoCodes.com — B2900 Subaru Code - Auto Headlight Control

What does this mean?

What are the Possible Causes of the DTC B2900 Subaru?

Faulty Auto Headlight Beam Leveler Control Module
Auto Headlight Beam Leveler Control Module harness is open or shorted
Auto Headlight Beam Leveler Control Module circuit poor electrical connection

How to Fix the DTC B2900 Subaru?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2900 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 B2900 Subaru Code

1. What does OBDII code B2900 in a Subaru indicate?

The B2900 code in a Subaru refers to a fault in the auto headlight control system.

2. What are the common symptoms of OBDII code B2900 in a Subaru?

Common symptoms include malfunctioning auto headlight control, headlights turning on or off unexpectedly, or the system failing to respond to changes in ambient light.

3. What are the possible causes of OBDII code B2900 in a Subaru?

Possible causes include a faulty light sensor, a malfunctioning auto headlight control module, wiring issues, or a software glitch in the control system.

4. How can I diagnose the OBDII code B2900 in my Subaru?

Diagnosing the B2900 code typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connections of the auto headlight control system, and testing the light sensor for proper functionality.

5. Can I repair OBDII code B2900 in my Subaru at home?

Depending on the cause of the code, some repairs for the B2900 may be possible at home, such as replacing a faulty light sensor or addressing wiring issues. However, more complex issues may require professional diagnosis and repair.

6. Is it safe to drive my Subaru with OBDII code B2900?

While driving with the B2900 code may not pose an immediate safety risk, it is recommended to address the issue promptly to ensure proper functioning of the auto headlight control system.

7. How much does it typically cost to repair OBDII code B2900 in a Subaru?

The cost of repairing the B2900 code can vary depending on the underlying cause and the labor rates of the repair shop. Simple fixes like replacing a sensor may be relatively inexpensive, while module replacements or complex wiring repairs could be more costly.

8. Can resetting the OBDII system clear the B2900 code in my Subaru?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the code to prevent future occurrences.

9. How long does it take to repair OBDII code B2900 in a Subaru?

The repair time for the B2900 code can vary depending on the complexity of the issue and the availability of parts. Simple fixes may be completed within an hour, while more involved repairs could take several hours or longer.

10. Can a mechanic help me with diagnosing and repairing OBDII code B2900 in my Subaru?

Yes, a qualified mechanic or auto technician can assist with diagnosing and repairing the B2900 code in your Subaru. Professional expertise and diagnostic tools may be necessary to pinpoint the exact cause of the issue and ensure a proper repair.