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Engine-Codes – GMC – B3806 GMC

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

Quick Answer

The B3806 GMC code indicates a malfunction in the high beam and headlamp flash select circuit in the vehicle. Common causes include Faulty headlight switch, Wiring harness issues or damage, Defective 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 GMC indicates High Beam and Headlamp Flash Select Circuit Malfunction.
Common causes
Common causes include Faulty headlight switch, Wiring harness issues or damage, Defective 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 12, 2024
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Code B3806 GMC Description

The B3806 GMC code indicates a malfunction in the high beam and headlamp flash select circuit in the vehicle. This circuit is responsible for controlling the activation of the high beams and the flash-to-pass feature on the headlights. When this circuit malfunctions, it can result in issues with the vehicle's lighting system, affecting visibility and overall safety while driving.

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

Common Causes of B3806 GMC

  1. Faulty headlight switch
  2. Wiring harness issues or damage
  3. Defective relay
  4. Malfunctioning control module
  5. Poor electrical connections

Symptoms of B3806 GMC

  1. High beams not working
  2. Inability to activate the flash-to-pass feature
  3. Headlights flickering or behaving erratically
  4. Dashboard warning light illuminated

How to Fix B3806 GMC

  1. Diagnose the issue: Use a diagnostic scan tool to retrieve the specific DTC and pinpoint the exact cause of the malfunction.
  2. Inspect components: Check the headlight switch, wiring harness, relay, and control module for any visible damage or signs of wear.
  3. Test electrical connections: Ensure all electrical connections are secure and free of corrosion that may be affecting the circuit's performance.
  4. Replace faulty components: Replace any components that are identified as the root cause of the issue, such as the headlight switch, relay, or control module.
  5. Clear the DTC: After making the necessary repairs, clear the DTC from the vehicle's memory using a diagnostic scan tool to reset the system and ensure the issue has been resolved.

Cost to Fix B3806 GMC

The cost of repairing a B3806 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, you can expect to pay anywhere from $100 to $300 for parts and labor. Keep in mind that prices may vary based on location, vehicle make and model, and the hourly labor rates charged by the auto repair shop. It's recommended to obtain quotes from multiple shops to find the best price for your specific situation.

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Information for Specific GMC Models

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 GMC Code

1. What are the common symptoms of OBDII code B3806 GMC (High Beam and Headlamp Flash Select Circuit Malfunction)?

- The common symptoms include malfunctioning high beams, issues with headlamp flashing, and the illumination of the check engine light.

2. What are the possible causes of OBDII code B3806 GMC?

- The possible causes include a faulty high beam switch, damaged wiring or connectors in the headlamp circuit, or a defective body control module.

3. How can I diagnose OBDII code B3806 GMC?

- Diagnosing this code typically involves using a scan tool to retrieve the specific fault code, checking the high beam switch functionality, inspecting wiring for damage, and testing the body control module.

4. Can I continue driving my vehicle with OBDII code B3806 GMC?

- It is not recommended to continue driving with this code as it can affect the proper operation of your high beams and headlamp flashing, compromising visibility and safety.

5. How can I repair OBDII code B3806 GMC?

- Repairing this code may involve replacing the high beam switch, repairing or replacing damaged wiring or connectors, or reprogramming the body control module if necessary.

6. Are there any DIY tips for addressing OBDII code B3806 GMC?

- DIY tips may include visually inspecting wiring for damage, checking fuses related to the headlamp circuit, and ensuring the high beam switch is functioning correctly.

7. Can weather conditions impact OBDII code B3806 GMC?

- Extreme weather conditions like excessive moisture or temperature fluctuations can potentially affect the electrical components involved, leading to the triggering of this fault code.

8. How long does it typically take to repair OBDII code B3806 GMC?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to diagnose and fix the problem.

9. Is it necessary to reset the fault code after repairing OBDII code B3806 GMC?

- Yes, it is important to clear the fault code using a scan tool after completing the repairs to ensure the check engine light is reset and the issue is resolved.

10. Will OBDII code B3806 GMC cause my vehicle to fail an emissions test?

- If left unresolved, this code may cause your vehicle to fail an emissions test, as it indicates a malfunction in the headlamp circuit that can impact overall vehicle performance.

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