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Engine-Codes – GMC – B3806 2015 GMC Sierra

B3806 2015 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

Quick Answer

The B3806 diagnostic trouble code for a 2015 GMC Sierra indicates a malfunction in the High Beam and Headlamp Flash Select Circuit. Common causes include Faulty headlight switch, Damaged wiring or connectors, Malfunctioning relay. 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
B3806 2015 GMC Sierra indicates High Beam and Headlamp Flash Select Circuit Malfunction.
Common causes
Common causes include Faulty headlight switch, Damaged wiring or connectors, Malfunctioning relay.
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 B3806 2015 GMC Sierra Description

The B3806 diagnostic trouble code for a 2015 GMC Sierra indicates a malfunction in the High Beam and Headlamp Flash Select Circuit. This code is usually associated with an issue in the electrical system that controls the high beam headlights and the headlamp flash function. When this code is triggered, it means that the vehicle's computer has detected a problem with the circuit that controls these lighting functions.

OBDII Code B3806 2015 GMC Sierra - High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2015 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

Common Causes of B3806 2015 GMC Sierra

  1. Faulty headlight switch
  2. Damaged wiring or connectors
  3. Malfunctioning relay
  4. Defective control module
  5. Corrosion in the electrical connections

Symptoms of B3806 2015 GMC Sierra

  1. High beam headlights not working
  2. Headlamp flash function not operational
  3. Dim or flickering headlights
  4. Dashboard warning light indicating a lighting system malfunction
  5. Inconsistent or unpredictable behavior of the high beam headlights

How to Fix B3806 2015 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the wiring, connectors, and components related to the high beam and headlamp flash circuit.
  2. Use a multimeter to test the continuity and voltage of the circuit to identify any faulty components.
  3. Replace any damaged wiring, connectors, or components that are causing the malfunction.
  4. Check and reset the headlight switch to ensure it is functioning correctly.
  5. Clear the diagnostic trouble code from the vehicle's computer and test the high beam and headlamp flash functions to verify that the issue has been resolved.

Cost to Fix B3806 2015 GMC Sierra

The typical repair costs for addressing a B3806 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the repair for this type of electrical issue could range from $150 to $500. However, it's important to note that labor rates at auto repair shops can vary, with hourly rates typically falling between $80 and $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances.

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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 B3806 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code B3806 in a 2015 GMC Sierra?

- Common symptoms include issues with the high beam headlights not functioning properly, difficulty switching between high and low beams, and the high beam indicator light staying on.

2. What are the potential causes of the High Beam and Headlamp Flash Select Circuit Malfunction (B3806) in a 2015 GMC Sierra?

- Possible causes may include a faulty headlamp flash switch, a malfunctioning high beam relay, wiring issues, or a problem with the high beam control module.

3. How can I diagnose the OBDII code B3806 in my 2015 GMC Sierra?

- You can diagnose this code by checking the high beam switch for proper operation, inspecting the wiring harness for any damage or loose connections, and testing the high beam relay and control module using a digital multimeter.

4. Can I continue driving my 2015 GMC Sierra with the B3806 trouble code?

- It is generally not recommended to continue driving with this code unresolved, as it can affect the proper functioning of your high beam headlights, compromising visibility and safety, especially at night.

5. How can I repair the High Beam and Headlamp Flash Select Circuit Malfunction in my 2015 GMC Sierra?

- Repair steps may include replacing the headlamp flash switch, repairing or replacing damaged wiring, checking and replacing the high beam relay if necessary, or addressing any issues with the high beam control module.

6. Are there any DIY tips for fixing the B3806 code in a 2015 GMC Sierra?

- DIY enthusiasts can start by inspecting the headlamp flash switch and wiring connections for any visible issues, but for more complex repairs involving the relay or control module, it may be best to consult a professional mechanic.

7. Is resetting the OBDII code B3806 enough to resolve the issue in a 2015 GMC Sierra?

- Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the High Beam and Headlamp Flash Select Circuit Malfunction.

8. How much does it typically cost to repair the B3806 code in a 2015 GMC Sierra at a professional auto repair shop?

- The cost of repairs can vary depending on the exact cause of the issue and local labor rates, but it's advisable to budget for diagnostic fees, parts replacement costs, and labor charges.

9. Can extreme weather conditions contribute to triggering the B3806 trouble code in a 2015 GMC Sierra?

- Extreme weather conditions, such as exposure to moisture or extreme temperatures, can potentially lead to electrical issues that may trigger the High Beam and Headlamp Flash Select Circuit Malfunction code.

10. Will fixing the B3806 code affect the vehicle's overall performance or fuel efficiency in a 2015 GMC Sierra?

- Resolving the B3806 code is primarily about ensuring the proper operation of the high beam headlights and related circuits, so once fixed, it should not significantly impact the overall performance or fuel efficiency of the vehicle.

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