AutoCodes – GMC – B3806 2014 GMC Sierra

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

Quick Answer

When the turn signal/multifunction switch is momentarily placed in the flash-to-pass position, ground is applied to the Body Control Module (BCM) through the flash-to-pass signal circuit. Common causes include Faulty Turn Signal/Multifunction Switch, Turn Signal/Multifunction Switch harness is open or shorted, Turn Signal/Multifunction Switch 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: B3806 2014 GMC Sierra indicates High Beam and Headlamp Flash Select Circuit Malfunction.
Common causes: Common causes include Faulty Turn Signal/Multifunction Switch, Turn Signal/Multifunction Switch harness is open or shorted, Turn Signal/Multifunction Switch 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 173

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 Jun 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3806 2014 GMC Sierra Description

When the turn signal/multifunction switch is momentarily placed in the flash-to-pass position, ground is applied to the Body Control Module (BCM) through the flash-to-pass signal circuit. The BCM responds to the flash-to-pass request by applying ground to the high-beam relay control circuit which energizes the high-beam relay. With the high beam relay energized, the switch contacts close allowing battery voltage to flow through the high beam fuses to the high beam control circuits illuminating the high beam headlamps. The high beam headlamps will only illuminate for as long as the flash-to-pass switch is activated. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground in the turn signal/multifunction switch flash to pass signal circuit.

OBDII Code B3806 2014 GMC Sierra - High Beam and Headlamp Flash Select Circuit Malfunction - AutoCodes.com — B3806 2014 GMC Sierra Code - High Beam and Headlamp Flash Select Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B3806 2014 GMC Sierra?

Faulty Turn Signal/Multifunction Switch
Turn Signal/Multifunction Switch harness is open or shorted
Turn Signal/Multifunction Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3806 2014 GMC Sierra?

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 B3806 2014 GMC Sierra 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.

Need more information about the B3806 2014 GMC Sierra code?

Need more information on how to fix the B3806 2014 GMC Sierra code? Get Access to Factory Service Manuals

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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.