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Engine-Codes – GMC – B3806 2018 GMC Sierra

B3806 2018 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

Quick Answer

The B3806 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a malfunction in the high beam and headlamp flash select circuit. Common causes include Faulty headlight control module, Wiring issues or shorts in the high beam circuit, Defective headlight switch. 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 2018 GMC Sierra indicates High Beam and Headlamp Flash Select Circuit Malfunction.
Common causes
Common causes include Faulty headlight control module, Wiring issues or shorts in the high beam circuit, Defective headlight switch.
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 17, 2024
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Code B3806 2018 GMC Sierra Description

The B3806 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a malfunction in the high beam and headlamp flash select circuit. This code is related to the vehicle's lighting system, specifically affecting the operation of the high beam headlights and the ability to flash the headlights. When this code is triggered, it means that the control module has detected an issue with the circuit responsible for controlling the high beams and headlamp flash function.

OBDII Code B3806 2018 GMC Sierra - High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2018 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

Common Causes of B3806 2018 GMC Sierra

  1. Faulty headlight control module
  2. Wiring issues or shorts in the high beam circuit
  3. Defective headlight switch
  4. Malfunctioning high beam relay
  5. Corrosion or poor connections in the lighting system

Symptoms of B3806 2018 GMC Sierra

  1. High beam headlights not working
  2. Headlamp flash function not functioning
  3. Dim or flickering headlights
  4. Dashboard warning light indicating a lighting system issue
  5. Inability to switch between high and low beams

How to Fix B3806 2018 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the lighting system, checking for any obvious signs of damage or loose connections.
  2. Use a multimeter to test the continuity of the high beam circuit, checking for any breaks or shorts in the wiring.
  3. Test the headlight control module and relay for proper operation, replacing them if found to be faulty.
  4. Inspect and test the headlight switch to ensure it is functioning correctly, replacing it if necessary.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool after completing the repairs.

Cost to Fix B3806 2018 GMC Sierra

The typical repair costs for addressing a B3806 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a headlight control module, relay, or switch can range from $50 to $200 each. Labor costs for diagnosing and repairing the problem can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total cost for resolving this issue may range from $150 to $600, including parts and labor. It's advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle.

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B3806 in a 2018 GMC Sierra?

- Common symptoms include malfunctioning high beam headlights, headlamp flash not working, and dashboard warning light indicating a circuit malfunction.

2. What does the OBDII code B3806 indicate in a 2018 GMC Sierra?

- The code B3806 indicates a High Beam and Headlamp Flash Select Circuit Malfunction in the vehicle's lighting system.

3. What are some possible causes of the B3806 OBDII code in a 2018 GMC Sierra?

- Potential causes include a faulty high beam switch, damaged wiring or connectors in the headlamp circuit, or a malfunctioning control module.

4. How can I diagnose the B3806 OBDII code in my 2018 GMC Sierra?

- To diagnose the issue, you may need to visually inspect the wiring and connectors, test the high beam switch for proper functioning, and use a diagnostic scanner to read the code and check for related faults.

5. Can I still drive my 2018 GMC Sierra with the B3806 OBDII code?

- While the vehicle may still be operable, it is recommended to address the issue promptly to ensure proper functioning of the high beam headlights and headlamp flash.

6. How can I repair the High Beam and Headlamp Flash Select Circuit Malfunction in my 2018 GMC Sierra?

- Repairing the issue may involve replacing a faulty high beam switch, repairing damaged wiring or connectors, or reprogramming the control module.

7. Is it safe to attempt DIY repairs for the B3806 OBDII code in a 2018 GMC Sierra?

- DIY repairs are possible for those with automotive repair experience, but if unsure, it is recommended to seek professional help to ensure proper diagnosis and repair.

8. How much can I expect to pay to fix the B3806 OBDII code in my 2018 GMC Sierra?

- Repair costs can vary based on the specific cause of the issue, but you may expect to pay anywhere from $100 to $500 for parts and labor, depending on the extent of the repair needed.

9. Will resetting the OBDII code B3806 in my 2018 GMC Sierra make the issue go away?

- Resetting the code may temporarily clear the dashboard warning light, but if the underlying issue is not addressed, the code is likely to reappear once the malfunction is detected again.

10. How can I prevent the recurrence of the B3806 OBDII code in my 2018 GMC Sierra?

- To prevent the code from reoccurring, ensure proper maintenance of the vehicle's lighting system, address any issues promptly, and follow recommended service schedules for your GMC Sierra.

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