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Engine-Codes – GMC – B3806 2014 GMC Sierra

B3806 2014 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

Quick Answer

The B3806 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a malfunction in the High Beam and Headlamp Flash Select Circuit. Common causes include Faulty wiring or connections in the high beam and headlamp flash circuit, Malfunctioning headlight switch, Defective high beam 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 2014 GMC Sierra indicates High Beam and Headlamp Flash Select Circuit Malfunction.
Common causes
Common causes include Faulty wiring or connections in the high beam and headlamp flash circuit, Malfunctioning headlight switch, Defective high beam 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 14, 2024
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Code B3806 2014 GMC Sierra Description

The B3806 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a malfunction in the High Beam and Headlamp Flash Select Circuit. This code is typically triggered when the vehicle's onboard computer detects an issue with the circuit responsible for controlling the high beam headlights and the headlamp flash function. The high beam headlights are an essential safety feature that provides increased visibility during nighttime driving or in low-light conditions. The headlamp flash select function allows the driver to quickly switch between high beam and low beam headlights to signal other drivers on the road.

OBDII Code B3806 2014 GMC Sierra - High Beam and Headlamp Flash Select Circuit Malfunction
B3806 2014 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

Common Causes of B3806 2014 GMC Sierra

  1. Faulty wiring or connections in the high beam and headlamp flash circuit
  2. Malfunctioning headlight switch
  3. Defective high beam relay
  4. Issues with the body control module (BCM)
  5. Electrical short circuits or corrosion in the wiring harness

Symptoms of B3806 2014 GMC Sierra

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

How to Fix B3806 2014 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the high beam and headlamp flash circuit, checking for any visible damage or loose connections.
  2. Use a multimeter to test the continuity and voltage of the circuit components, including the headlight switch, relay, and wiring.
  3. Replace any faulty components identified during testing, such as a defective relay or damaged wiring.
  4. Clear the DTC from the vehicle's computer using a diagnostic scan tool and test the high beam and headlamp flash functions to ensure they are operating correctly.
  5. If the issue persists, further diagnosis may be required to pinpoint the exact cause of the malfunction, potentially involving more in-depth electrical testing or BCM programming.

Cost to Fix B3806 2014 GMC Sierra

The typical repair costs for addressing a High Beam and Headlamp Flash Select Circuit Malfunction can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair could range from $50 to $200, while labor costs may range from $100 to $300. Additional costs for diagnostic testing and potential BCM programming could also apply.

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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 2014 GMC Sierra Code

1. What does the OBDII code B3806 mean on a 2014 GMC Sierra?

B3806 indicates a High Beam and Headlamp Flash Select Circuit Malfunction, meaning the vehicle's body control module (BCM) has detected an issue with the high beam or flash-to-pass circuit.

2. What are the common symptoms of code B3806 in a 2014 GMC Sierra?

Common symptoms include high beams not functioning, inability to use the flash-to-pass feature, or flickering headlights.

3. What causes the B3806 code to appear on a 2014 GMC Sierra?

Possible causes include a faulty high beam switch, damaged wiring, a defective relay, corroded connectors, or a malfunctioning BCM.

4. Can I still drive my 2014 GMC Sierra with the B3806 code?

Yes, the vehicle is still drivable, but it may not be safe to drive at night or in poor visibility conditions without functioning high beams.

5. How do I diagnose the B3806 code on my GMC Sierra?

Start by inspecting the high beam switch, wiring, and connectors for damage or corrosion. Use a multimeter to test circuit continuity, and check the BCM for further faults.

6. How is the B3806 code typically fixed on a 2014 GMC Sierra?

Repairs may include replacing the high beam switch, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the BCM if necessary.

7. How much does it cost to repair the B3806 code on a GMC Sierra?

Repair costs vary depending on the issue but can range from $50 for minor wiring repairs to $500 or more for BCM replacement or reprogramming.

8. Can a dead relay cause the B3806 code in a 2014 GMC Sierra?

Yes, a faulty relay in the high beam circuit can trigger the B3806 code and should be inspected during diagnosis.

9. Will clearing the code fix the B3806 issue on a GMC Sierra?

Clearing the code with a scan tool may temporarily reset it, but if the underlying problem is not resolved, the code will likely return.

10. Is the B3806 code related to other headlight issues?

Yes, it may be associated with other headlight issues, such as low beam malfunctions or intermittent headlight operation, depending on the shared circuits.

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